diff --git a/print-isoclns.c b/print-isoclns.c
new file mode 100644
index 0000000..d3935fc
--- /dev/null
+++ b/print-isoclns.c
@@ -0,0 +1,2709 @@
+/*
+ * Copyright (c) 1992, 1993, 1994, 1995, 1996
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Original code by Matt Thomas, Digital Equipment Corporation
+ *
+ * Extensively modified by Hannes Gredler (hannes@juniper.net) for more
+ * complete IS-IS & CLNP support.
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.133.2.25 2007/03/02 09:20:27 hannes Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <stdio.h>
+#include <string.h>
+
+#include "interface.h"
+#include "addrtoname.h"
+#include "ethertype.h"
+#include "ether.h"
+#include "nlpid.h"
+#include "extract.h"
+#include "gmpls.h"
+#include "oui.h"
+
+#define IPV4            1       /* AFI value */
+#define IPV6            2       /* AFI value */
+
+/*
+ * IS-IS is defined in ISO 10589.  Look there for protocol definitions.
+ */
+
+#define SYSTEM_ID_LEN	ETHER_ADDR_LEN
+#define NODE_ID_LEN     SYSTEM_ID_LEN+1
+#define LSP_ID_LEN      SYSTEM_ID_LEN+2
+
+#define ISIS_VERSION	1
+#define ESIS_VERSION	1
+#define CLNP_VERSION	1
+
+#define ISIS_PDU_TYPE_MASK      0x1F
+#define ESIS_PDU_TYPE_MASK      0x1F
+#define CLNP_PDU_TYPE_MASK      0x1F
+#define CLNP_FLAG_MASK          0xE0
+#define ISIS_LAN_PRIORITY_MASK  0x7F
+
+#define ISIS_PDU_L1_LAN_IIH	15
+#define ISIS_PDU_L2_LAN_IIH	16
+#define ISIS_PDU_PTP_IIH	17
+#define ISIS_PDU_L1_LSP       	18
+#define ISIS_PDU_L2_LSP       	20
+#define ISIS_PDU_L1_CSNP  	24
+#define ISIS_PDU_L2_CSNP  	25
+#define ISIS_PDU_L1_PSNP        26
+#define ISIS_PDU_L2_PSNP        27
+
+static struct tok isis_pdu_values[] = {
+    { ISIS_PDU_L1_LAN_IIH,       "L1 Lan IIH"},
+    { ISIS_PDU_L2_LAN_IIH,       "L2 Lan IIH"},
+    { ISIS_PDU_PTP_IIH,          "p2p IIH"},
+    { ISIS_PDU_L1_LSP,           "L1 LSP"},
+    { ISIS_PDU_L2_LSP,           "L2 LSP"},
+    { ISIS_PDU_L1_CSNP,          "L1 CSNP"},
+    { ISIS_PDU_L2_CSNP,          "L2 CSNP"},
+    { ISIS_PDU_L1_PSNP,          "L1 PSNP"},
+    { ISIS_PDU_L2_PSNP,          "L2 PSNP"},
+    { 0, NULL}
+};
+
+/*
+ * A TLV is a tuple of a type, length and a value and is normally used for
+ * encoding information in all sorts of places.  This is an enumeration of
+ * the well known types.
+ *
+ * list taken from rfc3359 plus some memory from veterans ;-)
+ */
+
+#define ISIS_TLV_AREA_ADDR           1   /* iso10589 */
+#define ISIS_TLV_IS_REACH            2   /* iso10589 */
+#define ISIS_TLV_ESNEIGH             3   /* iso10589 */
+#define ISIS_TLV_PART_DIS            4   /* iso10589 */
+#define ISIS_TLV_PREFIX_NEIGH        5   /* iso10589 */
+#define ISIS_TLV_ISNEIGH             6   /* iso10589 */
+#define ISIS_TLV_ISNEIGH_VARLEN      7   /* iso10589 */
+#define ISIS_TLV_PADDING             8   /* iso10589 */
+#define ISIS_TLV_LSP                 9   /* iso10589 */
+#define ISIS_TLV_AUTH                10  /* iso10589, rfc3567 */
+#define ISIS_TLV_CHECKSUM            12  /* rfc3358 */
+#define ISIS_TLV_CHECKSUM_MINLEN 2
+#define ISIS_TLV_LSP_BUFFERSIZE      14  /* iso10589 rev2 */
+#define ISIS_TLV_LSP_BUFFERSIZE_MINLEN 2
+#define ISIS_TLV_EXT_IS_REACH        22  /* draft-ietf-isis-traffic-05 */
+#define ISIS_TLV_IS_ALIAS_ID         24  /* draft-ietf-isis-ext-lsp-frags-02 */
+#define ISIS_TLV_DECNET_PHASE4       42
+#define ISIS_TLV_LUCENT_PRIVATE      66
+#define ISIS_TLV_INT_IP_REACH        128 /* rfc1195, rfc2966 */
+#define ISIS_TLV_PROTOCOLS           129 /* rfc1195 */
+#define ISIS_TLV_EXT_IP_REACH        130 /* rfc1195, rfc2966 */
+#define ISIS_TLV_IDRP_INFO           131 /* rfc1195 */
+#define ISIS_TLV_IDRP_INFO_MINLEN      1
+#define ISIS_TLV_IPADDR              132 /* rfc1195 */
+#define ISIS_TLV_IPAUTH              133 /* rfc1195 */
+#define ISIS_TLV_TE_ROUTER_ID        134 /* draft-ietf-isis-traffic-05 */
+#define ISIS_TLV_EXTD_IP_REACH       135 /* draft-ietf-isis-traffic-05 */
+#define ISIS_TLV_HOSTNAME            137 /* rfc2763 */
+#define ISIS_TLV_SHARED_RISK_GROUP   138 /* draft-ietf-isis-gmpls-extensions */
+#define ISIS_TLV_NORTEL_PRIVATE1     176
+#define ISIS_TLV_NORTEL_PRIVATE2     177
+#define ISIS_TLV_RESTART_SIGNALING   211 /* rfc3847 */
+#define ISIS_TLV_RESTART_SIGNALING_FLAGLEN 1
+#define ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN 2
+#define ISIS_TLV_MT_IS_REACH         222 /* draft-ietf-isis-wg-multi-topology-05 */
+#define ISIS_TLV_MT_SUPPORTED        229 /* draft-ietf-isis-wg-multi-topology-05 */
+#define ISIS_TLV_MT_SUPPORTED_MINLEN 2
+#define ISIS_TLV_IP6ADDR             232 /* draft-ietf-isis-ipv6-02 */
+#define ISIS_TLV_MT_IP_REACH         235 /* draft-ietf-isis-wg-multi-topology-05 */
+#define ISIS_TLV_IP6_REACH           236 /* draft-ietf-isis-ipv6-02 */
+#define ISIS_TLV_MT_IP6_REACH        237 /* draft-ietf-isis-wg-multi-topology-05 */
+#define ISIS_TLV_PTP_ADJ             240 /* rfc3373 */
+#define ISIS_TLV_IIH_SEQNR           241 /* draft-shen-isis-iih-sequence-00 */
+#define ISIS_TLV_IIH_SEQNR_MINLEN 4
+#define ISIS_TLV_VENDOR_PRIVATE      250 /* draft-ietf-isis-experimental-tlv-01 */
+#define ISIS_TLV_VENDOR_PRIVATE_MINLEN 3
+
+static struct tok isis_tlv_values[] = {
+    { ISIS_TLV_AREA_ADDR,	   "Area address(es)"},
+    { ISIS_TLV_IS_REACH,           "IS Reachability"},
+    { ISIS_TLV_ESNEIGH,            "ES Neighbor(s)"},
+    { ISIS_TLV_PART_DIS,           "Partition DIS"},
+    { ISIS_TLV_PREFIX_NEIGH,       "Prefix Neighbors"},
+    { ISIS_TLV_ISNEIGH,            "IS Neighbor(s)"},
+    { ISIS_TLV_ISNEIGH_VARLEN,     "IS Neighbor(s) (variable length)"},
+    { ISIS_TLV_PADDING,            "Padding"},
+    { ISIS_TLV_LSP,                "LSP entries"},
+    { ISIS_TLV_AUTH,               "Authentication"},
+    { ISIS_TLV_CHECKSUM,           "Checksum"},
+    { ISIS_TLV_LSP_BUFFERSIZE,     "LSP Buffersize"},
+    { ISIS_TLV_EXT_IS_REACH,       "Extended IS Reachability"},
+    { ISIS_TLV_IS_ALIAS_ID,        "IS Alias ID"},
+    { ISIS_TLV_DECNET_PHASE4,      "DECnet Phase IV"},
+    { ISIS_TLV_LUCENT_PRIVATE,     "Lucent Proprietary"},
+    { ISIS_TLV_INT_IP_REACH,       "IPv4 Internal Reachability"},
+    { ISIS_TLV_PROTOCOLS,          "Protocols supported"},
+    { ISIS_TLV_EXT_IP_REACH,       "IPv4 External Reachability"},
+    { ISIS_TLV_IDRP_INFO,          "Inter-Domain Information Type"},
+    { ISIS_TLV_IPADDR,             "IPv4 Interface address(es)"},
+    { ISIS_TLV_IPAUTH,             "IPv4 authentication (deprecated)"},
+    { ISIS_TLV_TE_ROUTER_ID,       "Traffic Engineering Router ID"},
+    { ISIS_TLV_EXTD_IP_REACH,      "Extended IPv4 Reachability"},
+    { ISIS_TLV_SHARED_RISK_GROUP,  "Shared Risk Link Group"},
+    { ISIS_TLV_NORTEL_PRIVATE1,    "Nortel Proprietary"},
+    { ISIS_TLV_NORTEL_PRIVATE2,    "Nortel Proprietary"},
+    { ISIS_TLV_HOSTNAME,           "Hostname"},
+    { ISIS_TLV_RESTART_SIGNALING,  "Restart Signaling"},
+    { ISIS_TLV_MT_IS_REACH,        "Multi Topology IS Reachability"},
+    { ISIS_TLV_MT_SUPPORTED,       "Multi Topology"},
+    { ISIS_TLV_IP6ADDR,            "IPv6 Interface address(es)"},
+    { ISIS_TLV_MT_IP_REACH,        "Multi-Topology IPv4 Reachability"},
+    { ISIS_TLV_IP6_REACH,          "IPv6 reachability"},
+    { ISIS_TLV_MT_IP6_REACH,       "Multi-Topology IP6 Reachability"},
+    { ISIS_TLV_PTP_ADJ,            "Point-to-point Adjacency State"},
+    { ISIS_TLV_IIH_SEQNR,          "Hello PDU Sequence Number"},
+    { ISIS_TLV_VENDOR_PRIVATE,     "Vendor Private"},
+    { 0, NULL }
+};
+
+#define ESIS_OPTION_PROTOCOLS        129
+#define ESIS_OPTION_QOS_MAINTENANCE  195 /* iso9542 */
+#define ESIS_OPTION_SECURITY         197 /* iso9542 */
+#define ESIS_OPTION_ES_CONF_TIME     198 /* iso9542 */
+#define ESIS_OPTION_PRIORITY         205 /* iso9542 */
+#define ESIS_OPTION_ADDRESS_MASK     225 /* iso9542 */
+#define ESIS_OPTION_SNPA_MASK        226 /* iso9542 */
+
+static struct tok esis_option_values[] = {
+    { ESIS_OPTION_PROTOCOLS,       "Protocols supported"},
+    { ESIS_OPTION_QOS_MAINTENANCE, "QoS Maintenance" },
+    { ESIS_OPTION_SECURITY,        "Security" },
+    { ESIS_OPTION_ES_CONF_TIME,    "ES Configuration Time" },
+    { ESIS_OPTION_PRIORITY,        "Priority" },
+    { ESIS_OPTION_ADDRESS_MASK,    "Addressk Mask" },
+    { ESIS_OPTION_SNPA_MASK,       "SNPA Mask" },
+    { 0, NULL }
+};
+
+#define CLNP_OPTION_DISCARD_REASON   193
+#define CLNP_OPTION_QOS_MAINTENANCE  195 /* iso8473 */
+#define CLNP_OPTION_SECURITY         197 /* iso8473 */
+#define CLNP_OPTION_SOURCE_ROUTING   200 /* iso8473 */
+#define CLNP_OPTION_ROUTE_RECORDING  203 /* iso8473 */
+#define CLNP_OPTION_PADDING          204 /* iso8473 */
+#define CLNP_OPTION_PRIORITY         205 /* iso8473 */
+
+static struct tok clnp_option_values[] = {
+    { CLNP_OPTION_DISCARD_REASON,  "Discard Reason"},
+    { CLNP_OPTION_PRIORITY,        "Priority"},
+    { CLNP_OPTION_QOS_MAINTENANCE, "QoS Maintenance"},
+    { CLNP_OPTION_SECURITY, "Security"},
+    { CLNP_OPTION_SOURCE_ROUTING, "Source Routing"},
+    { CLNP_OPTION_ROUTE_RECORDING, "Route Recording"},
+    { CLNP_OPTION_PADDING, "Padding"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_rfd_class_values[] = {
+    { 0x0, "General"},
+    { 0x8, "Address"},
+    { 0x9, "Source Routeing"},
+    { 0xa, "Lifetime"},
+    { 0xb, "PDU Discarded"},
+    { 0xc, "Reassembly"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_rfd_general_values[] = {
+    { 0x0, "Reason not specified"},
+    { 0x1, "Protocol procedure error"},
+    { 0x2, "Incorrect checksum"},
+    { 0x3, "PDU discarded due to congestion"},
+    { 0x4, "Header syntax error (cannot be parsed)"},
+    { 0x5, "Segmentation needed but not permitted"},
+    { 0x6, "Incomplete PDU received"},
+    { 0x7, "Duplicate option"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_rfd_address_values[] = {
+    { 0x0, "Destination address unreachable"},
+    { 0x1, "Destination address unknown"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_rfd_source_routeing_values[] = {
+    { 0x0, "Unspecified source routeing error"},
+    { 0x1, "Syntax error in source routeing field"},
+    { 0x2, "Unknown address in source routeing field"},
+    { 0x3, "Path not acceptable"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_rfd_lifetime_values[] = {
+    { 0x0, "Lifetime expired while data unit in transit"},
+    { 0x1, "Lifetime expired during reassembly"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_rfd_pdu_discard_values[] = {
+    { 0x0, "Unsupported option not specified"},
+    { 0x1, "Unsupported protocol version"},
+    { 0x2, "Unsupported security option"},
+    { 0x3, "Unsupported source routeing option"},
+    { 0x4, "Unsupported recording of route option"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_rfd_reassembly_values[] = {
+    { 0x0, "Reassembly interference"},
+    { 0, NULL }
+};
+
+/* array of 16 error-classes */
+static struct tok *clnp_option_rfd_error_class[] = {
+    clnp_option_rfd_general_values,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    clnp_option_rfd_address_values,
+    clnp_option_rfd_source_routeing_values,
+    clnp_option_rfd_lifetime_values,
+    clnp_option_rfd_pdu_discard_values,
+    clnp_option_rfd_reassembly_values,
+    NULL,
+    NULL,
+    NULL
+};
+
+#define CLNP_OPTION_OPTION_QOS_MASK 0x3f
+#define CLNP_OPTION_SCOPE_MASK      0xc0
+#define CLNP_OPTION_SCOPE_SA_SPEC   0x40
+#define CLNP_OPTION_SCOPE_DA_SPEC   0x80
+#define CLNP_OPTION_SCOPE_GLOBAL    0xc0
+
+static struct tok clnp_option_scope_values[] = {
+    { CLNP_OPTION_SCOPE_SA_SPEC, "Source Address Specific"},
+    { CLNP_OPTION_SCOPE_DA_SPEC, "Destination Address Specific"},
+    { CLNP_OPTION_SCOPE_GLOBAL, "Globally unique"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_sr_rr_values[] = {
+    { 0x0, "partial"},
+    { 0x1, "complete"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_sr_rr_string_values[] = {
+    { CLNP_OPTION_SOURCE_ROUTING, "source routing"},
+    { CLNP_OPTION_ROUTE_RECORDING, "recording of route in progress"},
+    { 0, NULL }
+};
+
+static struct tok clnp_option_qos_global_values[] = {
+    { 0x20, "reserved"},
+    { 0x10, "sequencing vs. delay"},
+    { 0x08, "congested"},
+    { 0x04, "delay vs. cost"},
+    { 0x02, "error vs. delay"},
+    { 0x01, "error vs. cost"},
+    { 0, NULL }
+};
+
+#define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP           3 /* draft-ietf-isis-traffic-05 */
+#define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID  4 /* draft-ietf-isis-gmpls-extensions */
+#define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID        5 /* draft-ietf-isis-traffic-05 */
+#define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR        6 /* draft-ietf-isis-traffic-05 */
+#define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR    8 /* draft-ietf-isis-traffic-05 */
+#define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW           9 /* draft-ietf-isis-traffic-05 */
+#define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW        10 /* draft-ietf-isis-traffic-05 */
+#define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW        11 /* rfc4124 */
+#define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD   12 /* draft-ietf-tewg-diff-te-proto-06 */
+#define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC            18 /* draft-ietf-isis-traffic-05 */
+#define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* draft-ietf-isis-gmpls-extensions */
+#define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR    21 /* draft-ietf-isis-gmpls-extensions */
+#define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS       22 /* rfc4124 */
+
+static struct tok isis_ext_is_reach_subtlv_values[] = {
+    { ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP,            "Administrative groups" },
+    { ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID,   "Link Local/Remote Identifier" },
+    { ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID,         "Link Remote Identifier" },
+    { ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR,         "IPv4 interface address" },
+    { ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR,     "IPv4 neighbor address" },
+    { ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW,            "Maximum link bandwidth" },
+    { ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW,          "Reservable link bandwidth" },
+    { ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW,          "Unreserved bandwidth" },
+    { ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC,              "Traffic Engineering Metric" },
+    { ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE,   "Link Protection Type" },
+    { ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR,      "Interface Switching Capability" },
+    { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD,     "Bandwidth Constraints (old)" },
+    { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS,         "Bandwidth Constraints" },
+    { 250,                                             "Reserved for cisco specific extensions" },
+    { 251,                                             "Reserved for cisco specific extensions" },
+    { 252,                                             "Reserved for cisco specific extensions" },
+    { 253,                                             "Reserved for cisco specific extensions" },
+    { 254,                                             "Reserved for cisco specific extensions" },
+    { 255,                                             "Reserved for future expansion" },
+    { 0, NULL }
+};
+
+#define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32          1 /* draft-ietf-isis-admin-tags-01 */
+#define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64          2 /* draft-ietf-isis-admin-tags-01 */
+#define ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR  117 /* draft-ietf-isis-wg-multi-topology-05 */
+
+static struct tok isis_ext_ip_reach_subtlv_values[] = {
+    { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32,           "32-Bit Administrative tag" },
+    { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64,           "64-Bit Administrative tag" },
+    { ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR,     "Management Prefix Color" },
+    { 0, NULL }
+};
+
+#define ISIS_SUBTLV_AUTH_SIMPLE        1
+#define ISIS_SUBTLV_AUTH_MD5          54
+#define ISIS_SUBTLV_AUTH_MD5_LEN      16
+#define ISIS_SUBTLV_AUTH_PRIVATE     255
+
+static struct tok isis_subtlv_auth_values[] = {
+    { ISIS_SUBTLV_AUTH_SIMPLE,	"simple text password"},
+    { ISIS_SUBTLV_AUTH_MD5,	"HMAC-MD5 password"},
+    { ISIS_SUBTLV_AUTH_PRIVATE,	"Routing Domain private password"},
+    { 0, NULL }
+};
+
+#define ISIS_SUBTLV_IDRP_RES           0
+#define ISIS_SUBTLV_IDRP_LOCAL         1
+#define ISIS_SUBTLV_IDRP_ASN           2
+
+static struct tok isis_subtlv_idrp_values[] = {
+    { ISIS_SUBTLV_IDRP_RES,         "Reserved"},
+    { ISIS_SUBTLV_IDRP_LOCAL,       "Routing-Domain Specific"},
+    { ISIS_SUBTLV_IDRP_ASN,         "AS Number Tag"},
+    { 0, NULL}
+};
+
+#define CLNP_SEGMENT_PART  0x80
+#define CLNP_MORE_SEGMENTS 0x40
+#define CLNP_REQUEST_ER    0x20
+
+static struct tok clnp_flag_values[] = {
+    { CLNP_SEGMENT_PART, "Segmentation permitted"},
+    { CLNP_MORE_SEGMENTS, "more Segments"},
+    { CLNP_REQUEST_ER, "request Error Report"},
+    { 0, NULL}
+};
+
+#define ISIS_MASK_LSP_OL_BIT(x)            ((x)&0x4)
+#define ISIS_MASK_LSP_ISTYPE_BITS(x)       ((x)&0x3)
+#define ISIS_MASK_LSP_PARTITION_BIT(x)     ((x)&0x80)
+#define ISIS_MASK_LSP_ATT_BITS(x)          ((x)&0x78)
+#define ISIS_MASK_LSP_ATT_ERROR_BIT(x)     ((x)&0x40)
+#define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x)   ((x)&0x20)
+#define ISIS_MASK_LSP_ATT_DELAY_BIT(x)     ((x)&0x10)
+#define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x)   ((x)&0x8)
+
+#define ISIS_MASK_MTID(x)                  ((x)&0x0fff)
+#define ISIS_MASK_MTFLAGS(x)               ((x)&0xf000)
+
+static struct tok isis_mt_flag_values[] = {
+    { 0x4000,                  "sub-TLVs present"},
+    { 0x8000,                  "ATT bit set"},
+    { 0, NULL}
+};
+
+#define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x)     ((x)&0x80)
+#define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x)     ((x)&0x40)
+
+#define ISIS_MASK_TLV_EXTD_IP6_IE(x)        ((x)&0x40)
+#define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x)    ((x)&0x20)
+
+#define ISIS_LSP_TLV_METRIC_SUPPORTED(x)   ((x)&0x80)
+#define ISIS_LSP_TLV_METRIC_IE(x)          ((x)&0x40)
+#define ISIS_LSP_TLV_METRIC_UPDOWN(x)      ((x)&0x80)
+#define ISIS_LSP_TLV_METRIC_VALUE(x)	   ((x)&0x3f)
+
+#define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
+
+static struct tok isis_mt_values[] = {
+    { 0,    "IPv4 unicast"},
+    { 1,    "In-Band Management"},
+    { 2,    "IPv6 unicast"},
+    { 3,    "Multicast"},
+    { 4095, "Development, Experimental or Proprietary"},
+    { 0, NULL }
+};
+
+static struct tok isis_iih_circuit_type_values[] = {
+    { 1,    "Level 1 only"},
+    { 2,    "Level 2 only"},
+    { 3,    "Level 1, Level 2"},
+    { 0, NULL}
+};
+
+#define ISIS_LSP_TYPE_UNUSED0   0
+#define ISIS_LSP_TYPE_LEVEL_1   1
+#define ISIS_LSP_TYPE_UNUSED2   2
+#define ISIS_LSP_TYPE_LEVEL_2   3
+
+static struct tok isis_lsp_istype_values[] = {
+    { ISIS_LSP_TYPE_UNUSED0,	"Unused 0x0 (invalid)"},
+    { ISIS_LSP_TYPE_LEVEL_1,	"L1 IS"},
+    { ISIS_LSP_TYPE_UNUSED2,	"Unused 0x2 (invalid)"},
+    { ISIS_LSP_TYPE_LEVEL_2,	"L2 IS"},
+    { 0, NULL }
+};
+
+/*
+ * Katz's point to point adjacency TLV uses codes to tell us the state of
+ * the remote adjacency.  Enumerate them.
+ */
+
+#define ISIS_PTP_ADJ_UP   0
+#define ISIS_PTP_ADJ_INIT 1
+#define ISIS_PTP_ADJ_DOWN 2
+
+static struct tok isis_ptp_adjancey_values[] = {
+    { ISIS_PTP_ADJ_UP,    "Up" },
+    { ISIS_PTP_ADJ_INIT,  "Initializing" },
+    { ISIS_PTP_ADJ_DOWN,  "Down" },
+    { 0, NULL}
+};
+
+struct isis_tlv_ptp_adj {
+    u_int8_t adjacency_state;
+    u_int8_t extd_local_circuit_id[4];
+    u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
+    u_int8_t neighbor_extd_local_circuit_id[4];
+};
+
+static int osi_cksum(const u_int8_t *, u_int);
+static int clnp_print(const u_int8_t *, u_int);
+static void esis_print(const u_int8_t *, u_int);
+static int isis_print(const u_int8_t *, u_int);
+
+struct isis_metric_block {
+    u_int8_t metric_default;
+    u_int8_t metric_delay;
+    u_int8_t metric_expense;
+    u_int8_t metric_error;
+};
+
+struct isis_tlv_is_reach {
+    struct isis_metric_block isis_metric_block;
+    u_int8_t neighbor_nodeid[NODE_ID_LEN];
+};
+
+struct isis_tlv_es_reach {
+    struct isis_metric_block isis_metric_block;
+    u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
+};
+
+struct isis_tlv_ip_reach {
+    struct isis_metric_block isis_metric_block;
+    u_int8_t prefix[4];
+    u_int8_t mask[4];
+};
+
+static struct tok isis_is_reach_virtual_values[] = {
+    { 0,    "IsNotVirtual"},
+    { 1,    "IsVirtual"},
+    { 0, NULL }
+};
+
+static struct tok isis_restart_flag_values[] = {
+    { 0x1,  "Restart Request"},
+    { 0x2,  "Restart Acknowledgement"},
+    { 0x4,  "Suppress adjacency advertisement"},
+    { 0, NULL }
+};
+
+struct isis_common_header {
+    u_int8_t nlpid;
+    u_int8_t fixed_len;
+    u_int8_t version;			/* Protocol version */
+    u_int8_t id_length;
+    u_int8_t pdu_type;		        /* 3 MSbits are reserved */
+    u_int8_t pdu_version;		/* Packet format version */
+    u_int8_t reserved;
+    u_int8_t max_area;
+};
+
+struct isis_iih_lan_header {
+    u_int8_t circuit_type;
+    u_int8_t source_id[SYSTEM_ID_LEN];
+    u_int8_t holding_time[2];
+    u_int8_t pdu_len[2];
+    u_int8_t priority;
+    u_int8_t lan_id[NODE_ID_LEN];
+};
+
+struct isis_iih_ptp_header {
+    u_int8_t circuit_type;
+    u_int8_t source_id[SYSTEM_ID_LEN];
+    u_int8_t holding_time[2];
+    u_int8_t pdu_len[2];
+    u_int8_t circuit_id;
+};
+
+struct isis_lsp_header {
+    u_int8_t pdu_len[2];
+    u_int8_t remaining_lifetime[2];
+    u_int8_t lsp_id[LSP_ID_LEN];
+    u_int8_t sequence_number[4];
+    u_int8_t checksum[2];
+    u_int8_t typeblock;
+};
+
+struct isis_csnp_header {
+    u_int8_t pdu_len[2];
+    u_int8_t source_id[NODE_ID_LEN];
+    u_int8_t start_lsp_id[LSP_ID_LEN];
+    u_int8_t end_lsp_id[LSP_ID_LEN];
+};
+
+struct isis_psnp_header {
+    u_int8_t pdu_len[2];
+    u_int8_t source_id[NODE_ID_LEN];
+};
+
+struct isis_tlv_lsp {
+    u_int8_t remaining_lifetime[2];
+    u_int8_t lsp_id[LSP_ID_LEN];
+    u_int8_t sequence_number[4];
+    u_int8_t checksum[2];
+};
+
+#define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
+#define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header))
+#define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header))
+#define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header))
+#define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
+#define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header))
+
+void isoclns_print(const u_int8_t *p, u_int length, u_int caplen)
+{
+	const struct isis_common_header *header;
+
+	header = (const struct isis_common_header *)p;
+
+        if (caplen <= 1) { /* enough bytes on the wire ? */
+            printf("|OSI");
+            return;
+        }
+
+        if (eflag)
+            printf("OSI NLPID %s (0x%02x): ",
+                   tok2str(nlpid_values,"Unknown",*p),
+                   *p);
+        
+	switch (*p) {
+
+	case NLPID_CLNP:
+		if (!clnp_print(p, length))
+                        print_unknown_data(p,"\n\t",caplen);
+		break;
+
+	case NLPID_ESIS:
+		esis_print(p, length);
+		return;
+
+	case NLPID_ISIS:
+		if (!isis_print(p, length))
+                        print_unknown_data(p,"\n\t",caplen);
+		break;
+
+	case NLPID_NULLNS:
+		(void)printf("%slength: %u",
+		             eflag ? "" : ", ",
+                             length);
+		break;
+
+        case NLPID_Q933:
+                q933_print(p+1, length-1);
+                break;
+
+        case NLPID_IP:
+		ip_print(gndo, p+1, length-1);
+                break;
+
+#ifdef INET6
+        case NLPID_IP6:
+                ip6_print(p+1, length-1);
+                break;
+#endif
+
+        case NLPID_PPP:
+                ppp_print(p+1, length-1);
+                break;
+
+	default:
+                if (!eflag)
+                    printf("OSI NLPID 0x%02x unknown",*p);
+		(void)printf("%slength: %u",
+		             eflag ? "" : ", ",
+                             length);
+		if (caplen > 1)
+                        print_unknown_data(p,"\n\t",caplen);
+		break;
+	}
+}
+
+#define	CLNP_PDU_ER	 1
+#define	CLNP_PDU_DT	28
+#define	CLNP_PDU_MD	29
+#define	CLNP_PDU_ERQ	30
+#define	CLNP_PDU_ERP	31
+
+static struct tok clnp_pdu_values[] = {
+    { CLNP_PDU_ER,  "Error Report"},
+    { CLNP_PDU_MD,  "MD"},
+    { CLNP_PDU_DT,  "Data"},
+    { CLNP_PDU_ERQ, "Echo Request"},
+    { CLNP_PDU_ERP, "Echo Response"},
+    { 0, NULL }
+};
+
+struct clnp_header_t {
+    u_int8_t nlpid;
+    u_int8_t length_indicator;
+    u_int8_t version;
+    u_int8_t lifetime; /* units of 500ms */
+    u_int8_t type;
+    u_int8_t segment_length[2];
+    u_int8_t cksum[2];
+};
+
+struct clnp_segment_header_t {
+    u_int8_t data_unit_id[2];
+    u_int8_t segment_offset[2];
+    u_int8_t total_length[2];
+};
+
+/*
+ * clnp_print
+ * Decode CLNP packets.  Return 0 on error.
+ */
+
+static int clnp_print (const u_int8_t *pptr, u_int length)
+{
+	const u_int8_t *optr,*source_address,*dest_address;
+        u_int li,tlen,nsap_offset,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags;
+	const struct clnp_header_t *clnp_header;
+	const struct clnp_segment_header_t *clnp_segment_header;
+        u_int8_t rfd_error_major,rfd_error_minor;
+
+	clnp_header = (const struct clnp_header_t *) pptr;
+        TCHECK(*clnp_header);
+
+        li = clnp_header->length_indicator;
+        optr = pptr;
+
+        if (!eflag)
+            printf("CLNP");
+
+        /*
+         * Sanity checking of the header.
+         */
+
+        if (clnp_header->version != CLNP_VERSION) {
+            printf("version %d packet not supported", clnp_header->version);
+            return (0);
+        }
+
+        /* FIXME further header sanity checking */
+
+        clnp_pdu_type = clnp_header->type & CLNP_PDU_TYPE_MASK;
+        clnp_flags = clnp_header->type & CLNP_FLAG_MASK;
+
+        pptr += sizeof(struct clnp_header_t);
+        li -= sizeof(struct clnp_header_t);
+        dest_address_length = *pptr;
+        dest_address = pptr + 1;
+
+        pptr += (1 + dest_address_length);
+        li -= (1 + dest_address_length);
+        source_address_length = *pptr;
+        source_address = pptr +1;
+
+        pptr += (1 + source_address_length);
+        li -= (1 + source_address_length);
+
+        if (vflag < 1) {
+            printf("%s%s > %s, %s, length %u",
+                   eflag ? "" : ", ",
+                   isonsap_string(source_address, source_address_length),
+                   isonsap_string(dest_address, dest_address_length),
+                   tok2str(clnp_pdu_values,"unknown (%u)",clnp_pdu_type),
+                   length);
+            return (1);
+        }
+        printf("%slength %u",eflag ? "" : ", ",length);
+
+        printf("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x ",
+               tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type),
+               clnp_header->length_indicator,
+               clnp_header->version,
+               clnp_header->lifetime/2,
+               (clnp_header->lifetime%2)*5,
+               EXTRACT_16BITS(clnp_header->segment_length),
+               EXTRACT_16BITS(clnp_header->cksum));
+
+        /* do not attempt to verify the checksum if it is zero */
+        if (EXTRACT_16BITS(clnp_header->cksum) == 0)
+                printf("(unverified)");
+            else printf("(%s)", osi_cksum(optr, clnp_header->length_indicator) ? "incorrect" : "correct");
+
+        printf("\n\tFlags [%s]",
+               bittok2str(clnp_flag_values,"none",clnp_flags));
+
+        printf("\n\tsource address (length %u): %s\n\tdest   address (length %u): %s",
+               source_address_length,
+               isonsap_string(source_address, source_address_length),
+               dest_address_length,
+               isonsap_string(dest_address,dest_address_length));
+
+        if (clnp_flags & CLNP_SEGMENT_PART) {
+            	clnp_segment_header = (const struct clnp_segment_header_t *) pptr;
+                TCHECK(*clnp_segment_header);
+                printf("\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u",
+                       EXTRACT_16BITS(clnp_segment_header->data_unit_id),
+                       EXTRACT_16BITS(clnp_segment_header->segment_offset),
+                       EXTRACT_16BITS(clnp_segment_header->total_length));
+                pptr+=sizeof(const struct clnp_segment_header_t);
+                li-=sizeof(const struct clnp_segment_header_t);
+        }
+
+        /* now walk the options */
+        while (li >= 2) {
+            u_int op, opli;
+            const u_int8_t *tptr;
+            
+            TCHECK2(*pptr, 2);
+            if (li < 2) {
+                printf(", bad opts/li");
+                return (0);
+            }
+            op = *pptr++;
+            opli = *pptr++;
+            li -= 2;
+            TCHECK2(*pptr, opli);
+            if (opli > li) {
+                printf(", opt (%d) too long", op);
+                return (0);
+            }
+            li -= opli;
+            tptr = pptr;
+            tlen = opli;
+            
+            printf("\n\t  %s Option #%u, length %u, value: ",
+                   tok2str(clnp_option_values,"Unknown",op),
+                   op,
+                   opli);
+
+            switch (op) {
+
+
+            case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */
+            case CLNP_OPTION_SOURCE_ROUTING:  
+                    printf("%s %s",
+                           tok2str(clnp_option_sr_rr_values,"Unknown",*tptr),
+                           tok2str(clnp_option_sr_rr_string_values,"Unknown Option %u",op));
+                    nsap_offset=*(tptr+1);
+                    if (nsap_offset == 0) {
+                            printf(" Bad NSAP offset (0)");
+                            break;
+                    }
+                    nsap_offset-=1; /* offset to nsap list */
+                    if (nsap_offset > tlen) {
+                            printf(" Bad NSAP offset (past end of option)");
+                            break;
+                    }
+                    tptr+=nsap_offset;
+                    tlen-=nsap_offset;
+                    while (tlen > 0) {
+                            source_address_length=*tptr;
+                            if (tlen < source_address_length+1) {
+                                    printf("\n\t    NSAP address goes past end of option");
+                                    break;
+                            }
+                            if (source_address_length > 0) {
+                                    source_address=(tptr+1);
+                                    TCHECK2(*source_address, source_address_length);
+                                    printf("\n\t    NSAP address (length %u): %s",
+                                           source_address_length,
+                                           isonsap_string(source_address, source_address_length));
+                            }
+                            tlen-=source_address_length+1;
+                    }
+                    break;
+
+            case CLNP_OPTION_PRIORITY:
+                    printf("0x%1x", *tptr&0x0f);
+                    break;
+
+            case CLNP_OPTION_QOS_MAINTENANCE:
+                    printf("\n\t    Format Code: %s",
+                           tok2str(clnp_option_scope_values,"Reserved",*tptr&CLNP_OPTION_SCOPE_MASK));
+
+                    if ((*tptr&CLNP_OPTION_SCOPE_MASK) == CLNP_OPTION_SCOPE_GLOBAL)
+                            printf("\n\t    QoS Flags [%s]",
+                                   bittok2str(clnp_option_qos_global_values,
+                                              "none",
+                                              *tptr&CLNP_OPTION_OPTION_QOS_MASK));
+                    break;
+
+            case CLNP_OPTION_SECURITY:
+                    printf("\n\t    Format Code: %s, Security-Level %u",
+                           tok2str(clnp_option_scope_values,"Reserved",*tptr&CLNP_OPTION_SCOPE_MASK),
+                           *(tptr+1));
+                    break;
+
+            case CLNP_OPTION_DISCARD_REASON:
+                rfd_error_major = (*tptr&0xf0) >> 4;
+                rfd_error_minor = *tptr&0x0f;
+                printf("\n\t    Class: %s Error (0x%01x), %s (0x%01x)",
+                       tok2str(clnp_option_rfd_class_values,"Unknown",rfd_error_major),
+                       rfd_error_major,
+                       tok2str(clnp_option_rfd_error_class[rfd_error_major],"Unknown",rfd_error_minor),
+                       rfd_error_minor);
+                break;
+
+            case CLNP_OPTION_PADDING:
+                    printf("padding data");
+                break;
+
+                /*
+                 * FIXME those are the defined Options that lack a decoder
+                 * you are welcome to contribute code ;-)
+                 */
+
+            default:
+                print_unknown_data(tptr,"\n\t  ",opli);
+                break;
+            }
+            if (vflag > 1)
+                print_unknown_data(pptr,"\n\t  ",opli);
+            pptr += opli;
+        }
+
+        switch (clnp_pdu_type) {
+
+        case    CLNP_PDU_ER: /* fall through */
+        case 	CLNP_PDU_ERP:
+            TCHECK(*pptr);
+            if (*(pptr) == NLPID_CLNP) {
+                printf("\n\t-----original packet-----\n\t");
+                /* FIXME recursion protection */
+                clnp_print(pptr, length-clnp_header->length_indicator);
+                break;
+            } 
+
+        case 	CLNP_PDU_DT:
+        case 	CLNP_PDU_MD:
+        case 	CLNP_PDU_ERQ:
+            
+        default:
+            /* dump the PDU specific data */
+            if (length-(pptr-optr) > 0) {
+                printf("\n\t  undecoded non-header data, length %u",length-clnp_header->length_indicator);
+                print_unknown_data(pptr,"\n\t  ",length-(pptr-optr));
+            }
+        }
+
+        return (1);
+
+ trunc:
+    fputs("[|clnp]", stdout);
+    return (1);
+
+}
+
+
+#define	ESIS_PDU_REDIRECT	6
+#define	ESIS_PDU_ESH	        2
+#define	ESIS_PDU_ISH	        4
+
+static struct tok esis_pdu_values[] = {
+    { ESIS_PDU_REDIRECT, "redirect"},
+    { ESIS_PDU_ESH,      "ESH"},
+    { ESIS_PDU_ISH,      "ISH"},
+    { 0, NULL }
+};
+
+struct esis_header_t {
+	u_int8_t nlpid;
+	u_int8_t length_indicator;
+	u_int8_t version;
+	u_int8_t reserved;
+	u_int8_t type;
+	u_int8_t holdtime[2];
+	u_int8_t cksum[2];
+};
+
+static void
+esis_print(const u_int8_t *pptr, u_int length)
+{
+	const u_int8_t *optr;
+	u_int li,esis_pdu_type,source_address_length, source_address_number;
+	const struct esis_header_t *esis_header;
+
+        if (!eflag)
+            printf("ES-IS");
+
+	if (length <= 2) {
+		if (qflag)
+			printf("bad pkt!");
+		else
+			printf("no header at all!");
+		return;
+	}
+
+	esis_header = (const struct esis_header_t *) pptr;
+        TCHECK(*esis_header);
+        li = esis_header->length_indicator;
+        optr = pptr;
+
+        /*
+         * Sanity checking of the header.
+         */
+
+        if (esis_header->nlpid != NLPID_ESIS) {
+            printf(" nlpid 0x%02x packet not supported", esis_header->nlpid);
+            return;
+        }
+
+        if (esis_header->version != ESIS_VERSION) {
+            printf(" version %d packet not supported", esis_header->version);
+            return;
+        }
+                
+	if (li > length) {
+            printf(" length indicator(%d) > PDU size (%d)!", li, length);
+            return;
+	}
+
+	if (li < sizeof(struct esis_header_t) + 2) {
+            printf(" length indicator < min PDU size %d:", li);
+            while (--length != 0)
+                printf("%02X", *pptr++);
+            return;
+	}
+
+        esis_pdu_type = esis_header->type & ESIS_PDU_TYPE_MASK;
+
+        if (vflag < 1) {
+            printf("%s%s, length %u",
+                   eflag ? "" : ", ",
+                   tok2str(esis_pdu_values,"unknown type (%u)",esis_pdu_type),
+                   length);
+            return;
+        } else
+            printf("%slength %u\n\t%s (%u)",
+                   eflag ? "" : ", ",
+                   length,
+                   tok2str(esis_pdu_values,"unknown type: %u", esis_pdu_type),
+                   esis_pdu_type);
+
+        printf(", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" );
+        printf(", checksum: 0x%04x ", EXTRACT_16BITS(esis_header->cksum));
+        /* do not attempt to verify the checksum if it is zero */
+        if (EXTRACT_16BITS(esis_header->cksum) == 0)
+                printf("(unverified)");
+        else
+                printf("(%s)", osi_cksum(pptr, li) ? "incorrect" : "correct");
+
+        printf(", holding time: %us, length indicator: %u",EXTRACT_16BITS(esis_header->holdtime),li);
+
+        if (vflag > 1)
+            print_unknown_data(optr,"\n\t",sizeof(struct esis_header_t));
+
+	pptr += sizeof(struct esis_header_t);
+	li -= sizeof(struct esis_header_t);
+
+	switch (esis_pdu_type) {
+	case ESIS_PDU_REDIRECT: {
+		const u_int8_t *dst, *snpa, *neta;
+		u_int dstl, snpal, netal;
+
+		TCHECK(*pptr);
+		if (li < 1) {
+			printf(", bad redirect/li");
+			return;
+		}
+		dstl = *pptr;
+		pptr++;
+		li--;
+		TCHECK2(*pptr, dstl);
+		if (li < dstl) {
+			printf(", bad redirect/li");
+			return;
+		}
+		dst = pptr;
+		pptr += dstl;
+                li -= dstl;
+		printf("\n\t  %s", isonsap_string(dst,dstl));
+
+		TCHECK(*pptr);
+		if (li < 1) {
+			printf(", bad redirect/li");
+			return;
+		}
+		snpal = *pptr;
+		pptr++;
+		li--;
+		TCHECK2(*pptr, snpal);
+		if (li < snpal) {
+			printf(", bad redirect/li");
+			return;
+		}
+		snpa = pptr;
+		pptr += snpal;
+                li -= snpal;
+		TCHECK(*pptr);
+		if (li < 1) {
+			printf(", bad redirect/li");
+			return;
+		}
+		netal = *pptr;
+		pptr++;
+		TCHECK2(*pptr, netal);
+		if (li < netal) {
+			printf(", bad redirect/li");
+			return;
+		}
+		neta = pptr;
+		pptr += netal;
+                li -= netal;
+
+		if (netal == 0)
+			printf("\n\t  %s", etheraddr_string(snpa));
+		else
+			printf("\n\t  %s", isonsap_string(neta,netal));
+		break;
+	}
+
+	case ESIS_PDU_ESH:
+            TCHECK(*pptr);
+            if (li < 1) {
+                printf(", bad esh/li");
+                return;
+            }
+            source_address_number = *pptr;
+            pptr++;
+            li--;
+
+            printf("\n\t  Number of Source Addresses: %u", source_address_number);
+           
+            while (source_address_number > 0) {
+                TCHECK(*pptr);
+            	if (li < 1) {
+                    printf(", bad esh/li");
+            	    return;
+            	}
+                source_address_length = *pptr;
+                pptr++;
+            	li--;
+
+                TCHECK2(*pptr, source_address_length);
+            	if (li < source_address_length) {
+                    printf(", bad esh/li");
+            	    return;
+            	}
+                printf("\n\t  NET (length: %u): %s",
+                       source_address_length,
+                       isonsap_string(pptr,source_address_length));
+                pptr += source_address_length;
+                li -= source_address_length;
+                source_address_number--;
+            }
+
+            break;
+
+	case ESIS_PDU_ISH: {
+            TCHECK(*pptr);
+            if (li < 1) {
+                printf(", bad ish/li");
+                return;
+            }
+            source_address_length = *pptr;
+            pptr++;
+            li--;
+            TCHECK2(*pptr, source_address_length);
+            if (li < source_address_length) {
+                printf(", bad ish/li");
+                return;
+            }
+            printf("\n\t  NET (length: %u): %s", source_address_length, isonsap_string(pptr, source_address_length));
+            pptr += source_address_length;
+            li -= source_address_length;
+            break;
+	}
+
+	default:
+            if (vflag <= 1) {
+		    if (pptr < snapend) 
+                            print_unknown_data(pptr,"\n\t  ",snapend-pptr);
+            }
+            return;
+	}
+
+        /* now walk the options */
+        while (li >= 2) {
+            u_int op, opli;
+            const u_int8_t *tptr;
+            
+            TCHECK2(*pptr, 2);
+            if (li < 2) {
+                printf(", bad opts/li");
+                return;
+            }
+            op = *pptr++;
+            opli = *pptr++;
+            li -= 2;
+            if (opli > li) {
+                printf(", opt (%d) too long", op);
+                return;
+            }
+            li -= opli;
+            tptr = pptr;
+            
+            printf("\n\t  %s Option #%u, length %u, value: ",
+                   tok2str(esis_option_values,"Unknown",op),
+                   op,
+                   opli);
+
+            switch (op) {
+
+            case ESIS_OPTION_ES_CONF_TIME:
+                TCHECK2(*pptr, 2);
+                printf("%us", EXTRACT_16BITS(tptr));
+                break;
+
+            case ESIS_OPTION_PROTOCOLS:
+                while (opli>0) {
+                    TCHECK(*pptr);
+                    printf("%s (0x%02x)",
+                           tok2str(nlpid_values,
+                                   "unknown",
+                                   *tptr),
+                           *tptr);
+                    if (opli>1) /* further NPLIDs ? - put comma */
+                        printf(", ");
+                    tptr++;
+                    opli--;
+                }
+                break;
+
+                /*
+                 * FIXME those are the defined Options that lack a decoder
+                 * you are welcome to contribute code ;-)
+                 */
+
+            case ESIS_OPTION_QOS_MAINTENANCE:
+            case ESIS_OPTION_SECURITY:
+            case ESIS_OPTION_PRIORITY:
+            case ESIS_OPTION_ADDRESS_MASK:
+            case ESIS_OPTION_SNPA_MASK:
+
+            default:
+                print_unknown_data(tptr,"\n\t  ",opli);
+                break;
+            }
+            if (vflag > 1)
+                print_unknown_data(pptr,"\n\t  ",opli);
+            pptr += opli;
+        }
+trunc:
+	return;
+}   
+
+/* shared routine for printing system, node and lsp-ids */
+static char *
+isis_print_id(const u_int8_t *cp, int id_len)
+{
+    int i;
+    static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")];
+    char *pos = id;
+
+    for (i = 1; i <= SYSTEM_ID_LEN; i++) {
+        snprintf(pos, sizeof(id) - (pos - id), "%02x", *cp++);
+	pos += strlen(pos);
+	if (i == 2 || i == 4)
+	    *pos++ = '.';
+	}
+    if (id_len >= NODE_ID_LEN) {
+        snprintf(pos, sizeof(id) - (pos - id), ".%02x", *cp++);
+	pos += strlen(pos);
+    }
+    if (id_len == LSP_ID_LEN)
+        snprintf(pos, sizeof(id) - (pos - id), "-%02x", *cp);
+    return (id);
+}
+
+/* print the 4-byte metric block which is common found in the old-style TLVs */
+static int
+isis_print_metric_block (const struct isis_metric_block *isis_metric_block)
+{
+    printf(", Default Metric: %d, %s",
+           ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default),
+           ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal");
+    if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay))
+        printf("\n\t\t  Delay Metric: %d, %s",
+               ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay),
+               ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal");
+    if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense))
+        printf("\n\t\t  Expense Metric: %d, %s",
+               ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense),
+               ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal");
+    if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error))
+        printf("\n\t\t  Error Metric: %d, %s",
+               ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error),
+               ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal");
+
+    return(1); /* everything is ok */
+}
+
+static int
+isis_print_tlv_ip_reach (const u_int8_t *cp, const char *ident, int length)
+{
+	int prefix_len;
+	const struct isis_tlv_ip_reach *tlv_ip_reach;
+
+	tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp;
+
+	while (length > 0) {
+		if ((size_t)length < sizeof(*tlv_ip_reach)) {
+			printf("short IPv4 Reachability (%d vs %lu)",
+                               length,
+                               (unsigned long)sizeof(*tlv_ip_reach));
+			return (0);
+		}
+
+		if (!TTEST(*tlv_ip_reach))
+		    return (0);
+
+		prefix_len = mask2plen(EXTRACT_32BITS(tlv_ip_reach->mask));
+
+		if (prefix_len == -1)
+			printf("%sIPv4 prefix: %s mask %s",
+                               ident,
+			       ipaddr_string((tlv_ip_reach->prefix)),
+			       ipaddr_string((tlv_ip_reach->mask)));
+		else
+			printf("%sIPv4 prefix: %15s/%u",
+                               ident,
+			       ipaddr_string((tlv_ip_reach->prefix)),
+			       prefix_len);
+
+		printf(", Distribution: %s, Metric: %u, %s",
+                       ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up",
+                       ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default),
+                       ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal");
+
+		if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay))
+                    printf("%s  Delay Metric: %u, %s",
+                           ident,
+                           ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay),
+                           ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal");
+                
+		if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense))
+                    printf("%s  Expense Metric: %u, %s",
+                           ident,
+                           ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense),
+                           ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal");
+                
+		if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error))
+                    printf("%s  Error Metric: %u, %s",
+                           ident,
+                           ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error),
+                           ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal");
+
+		length -= sizeof(struct isis_tlv_ip_reach);
+		tlv_ip_reach++;
+	}
+	return (1);
+}
+
+/*
+ * this is the common IP-REACH subTLV decoder it is called
+ * from various EXTD-IP REACH TLVs (135,235,236,237)
+ */
+
+static int
+isis_print_ip_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
+
+        /* first lets see if we know the subTLVs name*/
+	printf("%s%s subTLV #%u, length: %u",
+	       ident,
+               tok2str(isis_ext_ip_reach_subtlv_values,
+                       "unknown",
+                       subt),
+               subt,
+               subl);
+
+	if (!TTEST2(*tptr,subl))
+	    goto trunctlv;
+
+    switch(subt) {
+    case ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR: /* fall through */
+    case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32:
+        while (subl >= 4) {
+	    printf(", 0x%08x (=%u)",
+		   EXTRACT_32BITS(tptr),
+		   EXTRACT_32BITS(tptr));
+	    tptr+=4;
+	    subl-=4;
+	}
+	break;
+    case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64:
+        while (subl >= 8) {
+	    printf(", 0x%08x%08x",
+		   EXTRACT_32BITS(tptr),
+		   EXTRACT_32BITS(tptr+4));
+	    tptr+=8;
+	    subl-=8;
+	}
+	break;
+    default:
+	if(!print_unknown_data(tptr,"\n\t\t    ",
+			       subl))
+	  return(0);
+	break;
+    }
+    return(1);
+	
+trunctlv:
+    printf("%spacket exceeded snapshot",ident);
+    return(0);
+}
+
+/*
+ * this is the common IS-REACH subTLV decoder it is called
+ * from isis_print_ext_is_reach()
+ */
+
+static int
+isis_print_is_reach_subtlv (const u_int8_t *tptr,u_int subt,u_int subl,const char *ident) {
+
+        u_int te_class,priority_level;
+        union { /* int to float conversion buffer for several subTLVs */
+            float f; 
+            u_int32_t i;
+        } bw;
+
+        /* first lets see if we know the subTLVs name*/
+	printf("%s%s subTLV #%u, length: %u",
+	       ident,
+               tok2str(isis_ext_is_reach_subtlv_values,
+                       "unknown",
+                       subt),
+               subt,
+               subl);
+
+	if (!TTEST2(*tptr,subl))
+	    goto trunctlv;
+
+        switch(subt) {
+        case ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP:      
+        case ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID:
+        case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
+	    if (subl >= 4) {
+	      printf(", 0x%08x", EXTRACT_32BITS(tptr));
+	      if (subl == 8) /* draft-ietf-isis-gmpls-extensions */
+	        printf(", 0x%08x", EXTRACT_32BITS(tptr+4));
+	    }
+	    break;
+        case ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
+        case ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
+            if (subl >= sizeof(struct in_addr))
+              printf(", %s", ipaddr_string(tptr));
+            break;
+        case ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
+	case ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW:  
+            if (subl >= 4) {
+              bw.i = EXTRACT_32BITS(tptr);
+              printf(", %.3f Mbps", bw.f*8/1000000 );
+            }
+            break;
+        case ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
+            if (subl >= 32) {
+              for (te_class = 0; te_class < 8; te_class++) {
+                bw.i = EXTRACT_32BITS(tptr);
+                printf("%s  TE-Class %u: %.3f Mbps",
+                       ident,
+                       te_class,
+                       bw.f*8/1000000 );
+		tptr+=4;
+	      }
+            }
+            break;
+        case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS: /* fall through */
+        case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD:
+            printf("%sBandwidth Constraints Model ID: %s (%u)",
+                   ident,
+                   tok2str(diffserv_te_bc_values, "unknown", *tptr),
+                   *tptr);
+            tptr++;
+            /* decode BCs until the subTLV ends */
+            for (te_class = 0; te_class < (subl-1)/4; te_class++) {
+                bw.i = EXTRACT_32BITS(tptr);
+                printf("%s  Bandwidth constraint CT%u: %.3f Mbps",
+                       ident,
+                       te_class,
+                       bw.f*8/1000000 );
+		tptr+=4;
+            }
+            break;
+        case ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC:
+            if (subl >= 3)
+              printf(", %u", EXTRACT_24BITS(tptr));
+            break;
+        case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
+            if (subl >= 2) {
+              printf(", %s, Priority %u",
+		   bittok2str(gmpls_link_prot_values, "none", *tptr),
+                   *(tptr+1));
+            }
+            break;
+        case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
+            if (subl >= 36) {
+              printf("%s  Interface Switching Capability:%s",
+                   ident,
+                   tok2str(gmpls_switch_cap_values, "Unknown", *(tptr)));
+              printf(", LSP Encoding: %s",
+                   tok2str(gmpls_encoding_values, "Unknown", *(tptr+1)));
+	      tptr+=4;
+              printf("%s  Max LSP Bandwidth:",ident);
+              for (priority_level = 0; priority_level < 8; priority_level++) {
+                bw.i = EXTRACT_32BITS(tptr);
+                printf("%s    priority level %d: %.3f Mbps",
+                       ident,
+                       priority_level,
+                       bw.f*8/1000000 );
+		tptr+=4;
+              }
+              subl-=36;
+              /* there is some optional stuff left to decode but this is as of yet
+                 not specified so just lets hexdump what is left */
+              if(subl>0){
+                if(!print_unknown_data(tptr,"\n\t\t    ",
+				       subl))
+                    return(0);
+              }
+            }
+            break;
+        default:
+            if(!print_unknown_data(tptr,"\n\t\t    ",
+				   subl))
+                return(0);
+            break;
+        }
+        return(1);
+
+trunctlv:
+    printf("%spacket exceeded snapshot",ident);
+    return(0);
+}
+
+
+/*
+ * this is the common IS-REACH decoder it is called
+ * from various EXTD-IS REACH style TLVs (22,24,222)
+ */
+
+static int
+isis_print_ext_is_reach (const u_int8_t *tptr,const char *ident, int tlv_type) {
+
+    char ident_buffer[20];
+    int subtlv_type,subtlv_len,subtlv_sum_len;
+    int proc_bytes = 0; /* how many bytes did we process ? */
+    
+    if (!TTEST2(*tptr, NODE_ID_LEN))
+        return(0);
+
+    printf("%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN));
+    tptr+=(NODE_ID_LEN);
+
+    if (tlv_type != ISIS_TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */
+        if (!TTEST2(*tptr, 3))    /* and is therefore skipped */
+	    return(0);
+	printf(", Metric: %d",EXTRACT_24BITS(tptr));
+	tptr+=3;
+    }
+        
+    if (!TTEST2(*tptr, 1))
+        return(0);
+    subtlv_sum_len=*(tptr++); /* read out subTLV length */
+    proc_bytes=NODE_ID_LEN+3+1;
+    printf(", %ssub-TLVs present",subtlv_sum_len ? "" : "no ");
+    if (subtlv_sum_len) {
+        printf(" (%u)",subtlv_sum_len);
+        while (subtlv_sum_len>0) {
+            if (!TTEST2(*tptr,2))
+                return(0);
+            subtlv_type=*(tptr++);
+            subtlv_len=*(tptr++);
+            /* prepend the ident string */
+            snprintf(ident_buffer, sizeof(ident_buffer), "%s  ",ident);
+            if(!isis_print_is_reach_subtlv(tptr,subtlv_type,subtlv_len,ident_buffer))
+                return(0);
+            tptr+=subtlv_len;
+            subtlv_sum_len-=(subtlv_len+2);
+            proc_bytes+=(subtlv_len+2);
+        }
+    }
+    return(proc_bytes);
+}
+
+/*
+ * this is the common Multi Topology ID decoder
+ * it is called from various MT-TLVs (222,229,235,237)
+ */
+
+static int
+isis_print_mtid (const u_int8_t *tptr,const char *ident) {
+    
+    if (!TTEST2(*tptr, 2))
+        return(0);
+
+    printf("%s%s",
+           ident,
+           tok2str(isis_mt_values,
+                   "Reserved for IETF Consensus",
+                   ISIS_MASK_MTID(EXTRACT_16BITS(tptr))));
+
+    printf(" Topology (0x%03x), Flags: [%s]",
+           ISIS_MASK_MTID(EXTRACT_16BITS(tptr)),
+           bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_16BITS(tptr))));
+
+    return(2);
+}
+
+/*
+ * this is the common extended IP reach decoder
+ * it is called from TLVs (135,235,236,237)
+ * we process the TLV and optional subTLVs and return
+ * the amount of processed bytes
+ */
+
+static int
+isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi) {
+
+    char ident_buffer[20];
+#ifdef INET6
+    u_int8_t prefix[sizeof(struct in6_addr)]; /* shared copy buffer for IPv4 and IPv6 prefixes */
+#else
+    u_int8_t prefix[sizeof(struct in_addr)]; /* shared copy buffer for IPv4 prefixes */
+#endif
+    u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
+
+    if (!TTEST2(*tptr, 4))
+        return (0);
+    metric = EXTRACT_32BITS(tptr);
+    processed=4;
+    tptr+=4;
+    
+    if (afi == IPV4) {
+        if (!TTEST2(*tptr, 1)) /* fetch status byte */
+            return (0);
+        status_byte=*(tptr++);
+        bit_length = status_byte&0x3f;
+        if (bit_length > 32) {
+            printf("%sIPv4 prefix: bad bit length %u",
+                   ident,
+                   bit_length);
+            return (0);
+        }
+        processed++;
+#ifdef INET6
+    } else if (afi == IPV6) {
+        if (!TTEST2(*tptr, 1)) /* fetch status & prefix_len byte */
+            return (0);
+        status_byte=*(tptr++);
+        bit_length=*(tptr++);
+        if (bit_length > 128) {
+            printf("%sIPv6 prefix: bad bit length %u",
+                   ident,
+                   bit_length);
+            return (0);
+        }
+        processed+=2;
+#endif
+    } else
+        return (0); /* somebody is fooling us */
+
+    byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
+   
+    if (!TTEST2(*tptr, byte_length))
+        return (0);
+    memset(prefix, 0, sizeof prefix);   /* clear the copy buffer */
+    memcpy(prefix,tptr,byte_length);    /* copy as much as is stored in the TLV */
+    tptr+=byte_length;
+    processed+=byte_length;
+
+    if (afi == IPV4)
+        printf("%sIPv4 prefix: %15s/%u",
+               ident,
+               ipaddr_string(prefix),
+               bit_length);
+#ifdef INET6
+    if (afi == IPV6)
+        printf("%sIPv6 prefix: %s/%u",
+               ident,
+               ip6addr_string(prefix),
+               bit_length);
+#endif 
+   
+    printf(", Distribution: %s, Metric: %u",
+           ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up",
+           metric);
+
+    if (afi == IPV4 && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
+        printf(", sub-TLVs present");
+#ifdef INET6
+    if (afi == IPV6)
+        printf(", %s%s",
+               ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal",
+               ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : "");
+#endif
+    
+    if ((ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)  && afi == IPV4) ||
+        (ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) && afi == IPV6)) {
+        /* assume that one prefix can hold more
+           than one subTLV - therefore the first byte must reflect
+           the aggregate bytecount of the subTLVs for this prefix
+        */
+        if (!TTEST2(*tptr, 1))
+            return (0);
+        sublen=*(tptr++);
+        processed+=sublen+1;
+        printf(" (%u)",sublen);   /* print out subTLV length */
+        
+        while (sublen>0) {
+            if (!TTEST2(*tptr,2))
+                return (0);
+            subtlvtype=*(tptr++);
+            subtlvlen=*(tptr++);
+            /* prepend the ident string */
+            snprintf(ident_buffer, sizeof(ident_buffer), "%s  ",ident);
+            if(!isis_print_ip_reach_subtlv(tptr,subtlvtype,subtlvlen,ident_buffer))
+                return(0);
+            tptr+=subtlvlen;
+            sublen-=(subtlvlen+2);
+        }
+    }
+    return (processed);
+}
+
+/*
+ * isis_print
+ * Decode IS-IS packets.  Return 0 on error.
+ */
+
+static int isis_print (const u_int8_t *p, u_int length)
+{
+    const struct isis_common_header *isis_header;
+
+    const struct isis_iih_lan_header *header_iih_lan;
+    const struct isis_iih_ptp_header *header_iih_ptp;
+    const struct isis_lsp_header *header_lsp;
+    const struct isis_csnp_header *header_csnp;
+    const struct isis_psnp_header *header_psnp;
+
+    const struct isis_tlv_lsp *tlv_lsp;
+    const struct isis_tlv_ptp_adj *tlv_ptp_adj;
+    const struct isis_tlv_is_reach *tlv_is_reach;
+    const struct isis_tlv_es_reach *tlv_es_reach;
+
+    u_int8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len;
+    u_int8_t ext_is_len, ext_ip_len, mt_len;
+    const u_int8_t *optr, *pptr, *tptr;
+    u_short packet_len,pdu_len;
+    u_int i,vendor_id;
+
+    packet_len=length;
+    optr = p; /* initialize the _o_riginal pointer to the packet start -
+                 need it for parsing the checksum TLV */
+    isis_header = (const struct isis_common_header *)p;
+    TCHECK(*isis_header);
+    pptr = p+(ISIS_COMMON_HEADER_SIZE);
+    header_iih_lan = (const struct isis_iih_lan_header *)pptr;
+    header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
+    header_lsp = (const struct isis_lsp_header *)pptr;
+    header_csnp = (const struct isis_csnp_header *)pptr;
+    header_psnp = (const struct isis_psnp_header *)pptr;
+
+    if (!eflag)
+        printf("IS-IS");
+
+    /*
+     * Sanity checking of the header.
+     */
+
+    if (isis_header->version != ISIS_VERSION) {
+	printf("version %d packet not supported", isis_header->version);
+	return (0);
+    }
+
+    if ((isis_header->id_length != SYSTEM_ID_LEN) && (isis_header->id_length != 0)) {
+	printf("system ID length of %d is not supported",
+	       isis_header->id_length);
+	return (0);
+    }
+
+    if (isis_header->pdu_version != ISIS_VERSION) {
+	printf("version %d packet not supported", isis_header->pdu_version);
+	return (0);
+    }
+
+    max_area = isis_header->max_area;
+    switch(max_area) {
+    case 0:
+	max_area = 3;	 /* silly shit */
+	break;
+    case 255:
+	printf("bad packet -- 255 areas");
+	return (0);
+    default:
+	break;
+    }
+
+    id_length = isis_header->id_length;
+    switch(id_length) {
+    case 0:
+        id_length = 6;	 /* silly shit again */
+	break;
+    case 1:              /* 1-8 are valid sys-ID lenghts */
+    case 2:
+    case 3:
+    case 4:
+    case 5:
+    case 6:
+    case 7:
+    case 8:
+        break;
+    case 255:
+        id_length = 0;   /* entirely useless */
+	break;
+    default:
+        break;
+    }
+
+    /* toss any non 6-byte sys-ID len PDUs */
+    if (id_length != 6 ) { 
+	printf("bad packet -- illegal sys-ID length (%u)", id_length);
+	return (0);
+    }
+
+    pdu_type=isis_header->pdu_type;
+
+    /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/
+    if (vflag < 1) {
+        printf("%s%s",
+               eflag ? "" : ", ",
+               tok2str(isis_pdu_values,"unknown PDU-Type %u",pdu_type));
+
+	switch (pdu_type) {
+
+	case ISIS_PDU_L1_LAN_IIH:
+	case ISIS_PDU_L2_LAN_IIH:
+	    printf(", src-id %s",
+                   isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN));
+	    printf(", lan-id %s, prio %u",
+                   isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN),
+                   header_iih_lan->priority);
+	    break;
+	case ISIS_PDU_PTP_IIH:
+	    printf(", src-id %s", isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN));
+	    break;
+	case ISIS_PDU_L1_LSP:
+	case ISIS_PDU_L2_LSP:
+	    printf(", lsp-id %s, seq 0x%08x, lifetime %5us",
+		   isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
+		   EXTRACT_32BITS(header_lsp->sequence_number),
+		   EXTRACT_16BITS(header_lsp->remaining_lifetime));
+	    break;
+	case ISIS_PDU_L1_CSNP:
+	case ISIS_PDU_L2_CSNP:
+	    printf(", src-id %s", isis_print_id(header_csnp->source_id,NODE_ID_LEN));
+	    break;
+	case ISIS_PDU_L1_PSNP:
+	case ISIS_PDU_L2_PSNP:
+	    printf(", src-id %s", isis_print_id(header_psnp->source_id,NODE_ID_LEN));
+	    break;
+
+	}
+	printf(", length %u", length);
+
+        return(1);
+    }
+
+    /* ok they seem to want to know everything - lets fully decode it */
+    printf("%slength %u", eflag ? "" : ", ",length);
+
+    printf("\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
+           tok2str(isis_pdu_values,
+                   "unknown, type %u",
+                   pdu_type),
+           isis_header->fixed_len,
+           isis_header->version,
+           isis_header->pdu_version,
+	   id_length,
+	   isis_header->id_length,
+           max_area,
+           isis_header->max_area);
+
+    if (vflag > 1) {
+        if(!print_unknown_data(optr,"\n\t",8)) /* provide the _o_riginal pointer */
+            return(0);                         /* for optionally debugging the common header */
+    }
+
+    switch (pdu_type) {
+
+    case ISIS_PDU_L1_LAN_IIH:
+    case ISIS_PDU_L2_LAN_IIH:
+	if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) {
+	    printf(", bogus fixed header length %u should be %lu",
+		   isis_header->fixed_len, (unsigned long)ISIS_IIH_LAN_HEADER_SIZE);
+	    return (0);
+	}
+
+	pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len);
+	if (packet_len>pdu_len) {
+            packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
+            length=pdu_len;
+	}
+
+	TCHECK(*header_iih_lan);
+	printf("\n\t  source-id: %s,  holding time: %us, Flags: [%s]",
+               isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN),
+               EXTRACT_16BITS(header_iih_lan->holding_time),
+               tok2str(isis_iih_circuit_type_values,
+                       "unknown circuit type 0x%02x",
+                       header_iih_lan->circuit_type));
+
+	printf("\n\t  lan-id:    %s, Priority: %u, PDU length: %u",
+               isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN),
+               (header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK,
+               pdu_len);
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_IIH_LAN_HEADER_SIZE))
+                return(0);
+        }
+
+	packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
+	pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
+	break;
+
+    case ISIS_PDU_PTP_IIH:
+	if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) {
+	    printf(", bogus fixed header length %u should be %lu",
+		   isis_header->fixed_len, (unsigned long)ISIS_IIH_PTP_HEADER_SIZE);
+	    return (0);
+	}
+
+	pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len);
+	if (packet_len>pdu_len) {
+            packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
+            length=pdu_len;
+	}
+
+	TCHECK(*header_iih_ptp);
+	printf("\n\t  source-id: %s, holding time: %us, Flags: [%s]",
+               isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN),
+               EXTRACT_16BITS(header_iih_ptp->holding_time),
+               tok2str(isis_iih_circuit_type_values,
+                       "unknown circuit type 0x%02x",
+                       header_iih_ptp->circuit_type));
+
+	printf("\n\t  circuit-id: 0x%02x, PDU length: %u",
+               header_iih_ptp->circuit_id,
+               pdu_len);
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_IIH_PTP_HEADER_SIZE))
+                return(0);
+        }
+
+	packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
+	pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
+	break;
+
+    case ISIS_PDU_L1_LSP:
+    case ISIS_PDU_L2_LSP:
+	if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) {
+	    printf(", bogus fixed header length %u should be %lu",
+		   isis_header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE);
+	    return (0);
+	}
+
+	pdu_len=EXTRACT_16BITS(header_lsp->pdu_len);
+	if (packet_len>pdu_len) {
+            packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
+            length=pdu_len;
+	}
+
+	TCHECK(*header_lsp);
+	printf("\n\t  lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t  chksum: 0x%04x",
+               isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
+               EXTRACT_32BITS(header_lsp->sequence_number),
+               EXTRACT_16BITS(header_lsp->remaining_lifetime),
+               EXTRACT_16BITS(header_lsp->checksum));
+
+        /* if this is a purge do not attempt to verify the checksum */
+        if ( EXTRACT_16BITS(header_lsp->remaining_lifetime) == 0 &&
+             EXTRACT_16BITS(header_lsp->checksum) == 0)
+            printf(" (purged)");
+        else
+            /* verify the checksum -
+             * checking starts at the lsp-id field at byte position [12]
+             * hence the length needs to be reduced by 12 bytes */
+            printf(" (%s)", (osi_cksum((u_int8_t *)header_lsp->lsp_id, length-12)) ? "incorrect" : "correct");
+
+	printf(", PDU length: %u, Flags: [ %s",
+               pdu_len,
+               ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : "");
+
+	if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) {
+	    printf("%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "");
+	    printf("%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "");
+	    printf("%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "");
+	    printf("%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "");
+	    printf("ATT bit set, ");
+	}
+	printf("%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "");
+	printf("%s ]", tok2str(isis_lsp_istype_values,"Unknown(0x%x)",ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)));
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_LSP_HEADER_SIZE))
+                return(0);
+        }
+
+	packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
+	pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
+	break;
+
+    case ISIS_PDU_L1_CSNP:
+    case ISIS_PDU_L2_CSNP:
+	if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) {
+	    printf(", bogus fixed header length %u should be %lu",
+		   isis_header->fixed_len, (unsigned long)ISIS_CSNP_HEADER_SIZE);
+	    return (0);
+	}
+
+	pdu_len=EXTRACT_16BITS(header_csnp->pdu_len);
+	if (packet_len>pdu_len) {
+            packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
+            length=pdu_len;
+	}
+
+	TCHECK(*header_csnp);
+	printf("\n\t  source-id:    %s, PDU length: %u",
+               isis_print_id(header_csnp->source_id, NODE_ID_LEN),
+               pdu_len);
+	printf("\n\t  start lsp-id: %s",
+               isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN));
+	printf("\n\t  end lsp-id:   %s",
+               isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN));
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_CSNP_HEADER_SIZE))
+                return(0);
+        }
+
+	packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
+	pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
+        break;
+
+    case ISIS_PDU_L1_PSNP:
+    case ISIS_PDU_L2_PSNP:
+	if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) {
+	    printf("- bogus fixed header length %u should be %lu",
+		   isis_header->fixed_len, (unsigned long)ISIS_PSNP_HEADER_SIZE);
+	    return (0);
+	}
+
+	pdu_len=EXTRACT_16BITS(header_psnp->pdu_len);
+	if (packet_len>pdu_len) {
+            packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
+            length=pdu_len;
+	}
+
+	TCHECK(*header_psnp);
+	printf("\n\t  source-id:    %s, PDU length: %u",
+               isis_print_id(header_psnp->source_id, NODE_ID_LEN),
+               pdu_len);
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_PSNP_HEADER_SIZE))
+                return(0);
+        }
+
+	packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
+	pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
+	break;
+
+    default:
+	if(!print_unknown_data(pptr,"\n\t  ",length))
+	    return(0);
+	return (0);
+    }
+
+    /*
+     * Now print the TLV's.
+     */
+
+    while (packet_len >= 2) {
+        if (pptr == snapend) {
+	    return (1);
+        }
+
+	if (!TTEST2(*pptr, 2)) {
+	    printf("\n\t\t packet exceeded snapshot (%ld) bytes",
+                   (long)(pptr-snapend));
+	    return (1);
+	}
+	tlv_type = *pptr++;
+	tlv_len = *pptr++;
+        tmp =tlv_len; /* copy temporary len & pointer to packet data */
+        tptr = pptr;
+	packet_len -= 2;
+	if (tlv_len > packet_len) {
+	    break;
+	}
+
+        /* first lets see if we know the TLVs name*/
+	printf("\n\t    %s TLV #%u, length: %u",
+               tok2str(isis_tlv_values,
+                       "unknown",
+                       tlv_type),
+               tlv_type,
+               tlv_len);
+
+        if (tlv_len == 0) /* something is malformed */
+	    continue;
+
+        /* now check if we have a decoder otherwise do a hexdump at the end*/
+	switch (tlv_type) {
+	case ISIS_TLV_AREA_ADDR:
+	    if (!TTEST2(*tptr, 1))
+		goto trunctlv;
+	    alen = *tptr++;
+	    while (tmp && alen < tmp) {
+		printf("\n\t      Area address (length: %u): %s",
+                       alen,
+                       isonsap_string(tptr,alen));
+		tptr += alen;
+		tmp -= alen + 1;
+		if (tmp==0) /* if this is the last area address do not attemt a boundary check */
+                    break;
+		if (!TTEST2(*tptr, 1))
+		    goto trunctlv;
+		alen = *tptr++;
+	    }
+	    break;
+	case ISIS_TLV_ISNEIGH:
+	    while (tmp >= ETHER_ADDR_LEN) {
+                if (!TTEST2(*tptr, ETHER_ADDR_LEN))
+                    goto trunctlv;
+                printf("\n\t      SNPA: %s",isis_print_id(tptr,ETHER_ADDR_LEN));
+                tmp -= ETHER_ADDR_LEN;
+                tptr += ETHER_ADDR_LEN;
+	    }
+	    break;
+
+        case ISIS_TLV_ISNEIGH_VARLEN:
+            if (!TTEST2(*tptr, 1) || tmp < 3) /* min. TLV length */
+		goto trunctlv;
+	    lan_alen = *tptr++; /* LAN address length */
+	    if (lan_alen == 0) {
+                printf("\n\t      LAN address length 0 bytes (invalid)");
+                break;
+            }
+            tmp --;
+            printf("\n\t      LAN address length %u bytes ",lan_alen);
+	    while (tmp >= lan_alen) {
+                if (!TTEST2(*tptr, lan_alen))
+                    goto trunctlv;
+                printf("\n\t\tIS Neighbor: %s",isis_print_id(tptr,lan_alen));
+                tmp -= lan_alen;
+                tptr +=lan_alen;
+            }
+            break;
+
+	case ISIS_TLV_PADDING:
+	    break;
+
+        case ISIS_TLV_MT_IS_REACH:
+            while (tmp >= 2+NODE_ID_LEN+3+1) {
+                mt_len = isis_print_mtid(tptr, "\n\t      ");
+                if (mt_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=mt_len;
+                tmp-=mt_len;
+
+                ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
+                if (ext_is_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                   
+                tmp-=ext_is_len;
+                tptr+=ext_is_len;
+            }
+            break;
+
+        case ISIS_TLV_IS_ALIAS_ID:
+	    while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */
+	        ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
+		if (ext_is_len == 0) /* did something go wrong ? */
+	            goto trunctlv;
+		tmp-=ext_is_len;
+		tptr+=ext_is_len;
+	    }
+	    break;
+
+        case ISIS_TLV_EXT_IS_REACH:
+            while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */
+                ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
+                if (ext_is_len == 0) /* did something go wrong ? */
+                    goto trunctlv;                   
+                tmp-=ext_is_len;
+                tptr+=ext_is_len;
+            }
+            break;
+        case ISIS_TLV_IS_REACH:
+	    if (!TTEST2(*tptr,1))  /* check if there is one byte left to read out the virtual flag */
+                goto trunctlv;
+            printf("\n\t      %s",
+                   tok2str(isis_is_reach_virtual_values,
+                           "bogus virtual flag 0x%02x",
+                           *tptr++));
+	    tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
+            while (tmp >= sizeof(struct isis_tlv_is_reach)) {
+		if (!TTEST(*tlv_is_reach))
+		    goto trunctlv;
+		printf("\n\t      IS Neighbor: %s",
+		       isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN));
+                isis_print_metric_block(&tlv_is_reach->isis_metric_block);
+		tmp -= sizeof(struct isis_tlv_is_reach);
+		tlv_is_reach++;
+	    }
+            break;
+
+        case ISIS_TLV_ESNEIGH:
+	    tlv_es_reach = (const struct isis_tlv_es_reach *)tptr;
+            while (tmp >= sizeof(struct isis_tlv_es_reach)) {
+		if (!TTEST(*tlv_es_reach))
+		    goto trunctlv;
+		printf("\n\t      ES Neighbor: %s",
+                       isis_print_id(tlv_es_reach->neighbor_sysid,SYSTEM_ID_LEN));
+                isis_print_metric_block(&tlv_es_reach->isis_metric_block);
+		tmp -= sizeof(struct isis_tlv_es_reach);
+		tlv_es_reach++;
+	    }
+            break;
+
+            /* those two TLVs share the same format */
+	case ISIS_TLV_INT_IP_REACH:
+	case ISIS_TLV_EXT_IP_REACH:
+	    if (!isis_print_tlv_ip_reach(pptr, "\n\t      ", tlv_len))
+		return (1);
+	    break;
+
+	case ISIS_TLV_EXTD_IP_REACH:
+	    while (tmp>0) {
+                ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV4);
+                if (ext_ip_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=ext_ip_len;
+		tmp-=ext_ip_len;
+	    }
+	    break;
+
+        case ISIS_TLV_MT_IP_REACH:
+            mt_len = isis_print_mtid(tptr, "\n\t      ");
+            if (mt_len == 0) { /* did something go wrong ? */
+                goto trunctlv;
+            }
+            tptr+=mt_len;
+            tmp-=mt_len;
+
+            while (tmp>0) {
+                ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV4);
+                if (ext_ip_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=ext_ip_len;
+		tmp-=ext_ip_len;
+	    }
+	    break;
+
+#ifdef INET6
+	case ISIS_TLV_IP6_REACH:
+	    while (tmp>0) {
+                ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV6);
+                if (ext_ip_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=ext_ip_len;
+		tmp-=ext_ip_len;
+	    }
+	    break;
+
+	case ISIS_TLV_MT_IP6_REACH:
+            mt_len = isis_print_mtid(tptr, "\n\t      ");
+            if (mt_len == 0) { /* did something go wrong ? */
+                goto trunctlv;
+            }
+            tptr+=mt_len;
+            tmp-=mt_len;
+
+	    while (tmp>0) {
+                ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV6);
+                if (ext_ip_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=ext_ip_len;
+		tmp-=ext_ip_len;
+	    }
+	    break;
+
+	case ISIS_TLV_IP6ADDR:
+	    while (tmp>=sizeof(struct in6_addr)) {
+		if (!TTEST2(*tptr, sizeof(struct in6_addr)))
+		    goto trunctlv;
+
+                printf("\n\t      IPv6 interface address: %s",
+		       ip6addr_string(tptr));
+
+		tptr += sizeof(struct in6_addr);
+		tmp -= sizeof(struct in6_addr);
+	    }
+	    break;
+#endif
+	case ISIS_TLV_AUTH:
+	    if (!TTEST2(*tptr, 1))
+		goto trunctlv;
+
+            printf("\n\t      %s: ",
+                   tok2str(isis_subtlv_auth_values,
+                           "unknown Authentication type 0x%02x",
+                           *tptr));
+
+	    switch (*tptr) {
+	    case ISIS_SUBTLV_AUTH_SIMPLE:
+		for(i=1;i<tlv_len;i++) {
+		    if (!TTEST2(*(tptr+i), 1))
+			goto trunctlv;
+		    printf("%c",*(tptr+i));
+		}
+		break;
+	    case ISIS_SUBTLV_AUTH_MD5:
+		for(i=1;i<tlv_len;i++) {
+		    if (!TTEST2(*(tptr+i), 1))
+			goto trunctlv;
+		    printf("%02x",*(tptr+i));
+		}
+		if (tlv_len != ISIS_SUBTLV_AUTH_MD5_LEN+1)
+                    printf(", (malformed subTLV) ");
+		break;
+	    case ISIS_SUBTLV_AUTH_PRIVATE:
+	    default:
+		if(!print_unknown_data(tptr+1,"\n\t\t  ",tlv_len-1))
+		    return(0);
+		break;
+	    }
+	    break;
+
+	case ISIS_TLV_PTP_ADJ:
+	    tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
+	    if(tmp>=1) {
+		if (!TTEST2(*tptr, 1))
+		    goto trunctlv;
+		printf("\n\t      Adjacency State: %s (%u)",
+		       tok2str(isis_ptp_adjancey_values, "unknown", *tptr),
+                        *tptr);
+		tmp--;
+	    }
+	    if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) {
+		if (!TTEST2(tlv_ptp_adj->extd_local_circuit_id,
+                            sizeof(tlv_ptp_adj->extd_local_circuit_id)))
+		    goto trunctlv;
+		printf("\n\t      Extended Local circuit-ID: 0x%08x",
+		       EXTRACT_32BITS(tlv_ptp_adj->extd_local_circuit_id));
+		tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id);
+	    }
+	    if(tmp>=SYSTEM_ID_LEN) {
+		if (!TTEST2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN))
+		    goto trunctlv;
+		printf("\n\t      Neighbor System-ID: %s",
+		       isis_print_id(tlv_ptp_adj->neighbor_sysid,SYSTEM_ID_LEN));
+		tmp-=SYSTEM_ID_LEN;
+	    }
+	    if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) {
+		if (!TTEST2(tlv_ptp_adj->neighbor_extd_local_circuit_id,
+                            sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)))
+		    goto trunctlv;
+		printf("\n\t      Neighbor Extended Local circuit-ID: 0x%08x",
+		       EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id));
+	    }
+	    break;
+
+	case ISIS_TLV_PROTOCOLS:
+	    printf("\n\t      NLPID(s): ");
+	    while (tmp>0) {
+		if (!TTEST2(*(tptr), 1))
+		    goto trunctlv;
+		printf("%s (0x%02x)",
+                       tok2str(nlpid_values,
+                               "unknown",
+                               *tptr),
+                       *tptr);
+		if (tmp>1) /* further NPLIDs ? - put comma */
+		    printf(", ");
+                tptr++;
+                tmp--;
+	    }
+	    break;
+
+	case ISIS_TLV_TE_ROUTER_ID:
+	    if (!TTEST2(*pptr, sizeof(struct in_addr)))
+		goto trunctlv;
+	    printf("\n\t      Traffic Engineering Router ID: %s", ipaddr_string(pptr));
+	    break;
+
+	case ISIS_TLV_IPADDR:
+	    while (tmp>=sizeof(struct in_addr)) {
+		if (!TTEST2(*tptr, sizeof(struct in_addr)))
+		    goto trunctlv;
+		printf("\n\t      IPv4 interface address: %s", ipaddr_string(tptr));
+		tptr += sizeof(struct in_addr);
+		tmp -= sizeof(struct in_addr);
+	    }
+	    break;
+
+	case ISIS_TLV_HOSTNAME:
+	    printf("\n\t      Hostname: ");
+	    while (tmp>0) {
+		if (!TTEST2(*tptr, 1))
+		    goto trunctlv;
+		printf("%c",*tptr++);
+                tmp--;
+	    }
+	    break;
+
+	case ISIS_TLV_SHARED_RISK_GROUP:
+	    if (tmp < NODE_ID_LEN)
+	        break;
+	    if (!TTEST2(*tptr, NODE_ID_LEN))
+                goto trunctlv;
+	    printf("\n\t      IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN));
+	    tptr+=(NODE_ID_LEN);
+	    tmp-=(NODE_ID_LEN);
+
+	    if (tmp < 1)
+	        break;
+	    if (!TTEST2(*tptr, 1))
+                goto trunctlv;
+	    printf(", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered");
+	    tmp--;
+
+	    if (tmp < sizeof(struct in_addr))
+	        break;
+	    if (!TTEST2(*tptr,sizeof(struct in_addr)))
+                goto trunctlv;
+	    printf("\n\t      IPv4 interface address: %s", ipaddr_string(tptr));
+	    tptr+=sizeof(struct in_addr);
+	    tmp-=sizeof(struct in_addr);
+
+	    if (tmp < sizeof(struct in_addr))
+	        break;
+	    if (!TTEST2(*tptr,sizeof(struct in_addr)))
+                goto trunctlv;
+	    printf("\n\t      IPv4 neighbor address: %s", ipaddr_string(tptr));
+	    tptr+=sizeof(struct in_addr);
+	    tmp-=sizeof(struct in_addr);
+
+	    while (tmp>=4) {
+                if (!TTEST2(*tptr, 4))
+                    goto trunctlv;
+                printf("\n\t      Link-ID: 0x%08x", EXTRACT_32BITS(tptr));
+                tptr+=4;
+                tmp-=4;
+	    }
+	    break;
+
+	case ISIS_TLV_LSP:
+	    tlv_lsp = (const struct isis_tlv_lsp *)tptr;
+	    while(tmp>=sizeof(struct isis_tlv_lsp)) {
+		if (!TTEST((tlv_lsp->lsp_id)[LSP_ID_LEN-1]))
+		    goto trunctlv;
+		printf("\n\t      lsp-id: %s",
+                       isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN));
+		if (!TTEST2(tlv_lsp->sequence_number, 4))
+		    goto trunctlv;
+		printf(", seq: 0x%08x",EXTRACT_32BITS(tlv_lsp->sequence_number));
+		if (!TTEST2(tlv_lsp->remaining_lifetime, 2))
+		    goto trunctlv;
+		printf(", lifetime: %5ds",EXTRACT_16BITS(tlv_lsp->remaining_lifetime));
+		if (!TTEST2(tlv_lsp->checksum, 2))
+		    goto trunctlv;
+		printf(", chksum: 0x%04x",EXTRACT_16BITS(tlv_lsp->checksum));
+		tmp-=sizeof(struct isis_tlv_lsp);
+		tlv_lsp++;
+	    }
+	    break;
+
+	case ISIS_TLV_CHECKSUM:
+	    if (tmp < ISIS_TLV_CHECKSUM_MINLEN)
+	        break;
+	    if (!TTEST2(*tptr, ISIS_TLV_CHECKSUM_MINLEN))
+		goto trunctlv;
+	    printf("\n\t      checksum: 0x%04x ", EXTRACT_16BITS(tptr));
+            /* do not attempt to verify the checksum if it is zero
+             * most likely a HMAC-MD5 TLV is also present and
+             * to avoid conflicts the checksum TLV is zeroed.
+             * see rfc3358 for details
+             */
+            if (EXTRACT_16BITS(tptr) == 0)
+                printf("(unverified)");
+            else printf("(%s)", osi_cksum(optr, length) ? "incorrect" : "correct");
+	    break;
+
+	case ISIS_TLV_MT_SUPPORTED:
+            if (tmp < ISIS_TLV_MT_SUPPORTED_MINLEN)
+                break;
+	    while (tmp>1) {
+		/* length can only be a multiple of 2, otherwise there is
+		   something broken -> so decode down until length is 1 */
+		if (tmp!=1) {
+                    mt_len = isis_print_mtid(tptr, "\n\t      ");
+                    if (mt_len == 0) /* did something go wrong ? */
+                        goto trunctlv;
+                    tptr+=mt_len;
+                    tmp-=mt_len;
+		} else {
+		    printf("\n\t      malformed MT-ID");
+		    break;
+		}
+	    }
+	    break;
+
+	case ISIS_TLV_RESTART_SIGNALING:
+            /* first attempt to decode the flags */
+            if (tmp < ISIS_TLV_RESTART_SIGNALING_FLAGLEN)
+                break;
+            if (!TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN))
+                goto trunctlv;
+            printf("\n\t      Flags [%s]",
+                   bittok2str(isis_restart_flag_values, "none", *tptr));
+            tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
+            tmp-=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
+
+            /* is there anything other than the flags field? */
+            if (tmp == 0)
+                break;
+
+            if (tmp < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN)
+                break;
+            if (!TTEST2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN))
+                goto trunctlv;
+
+            printf(", Remaining holding time %us", EXTRACT_16BITS(tptr));
+            tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
+            tmp-=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
+
+            /* is there an additional sysid field present ?*/
+            if (tmp == SYSTEM_ID_LEN) {
+                    if (!TTEST2(*tptr, SYSTEM_ID_LEN))
+                            goto trunctlv;
+                    printf(", for %s",isis_print_id(tptr,SYSTEM_ID_LEN));
+            } 
+	    break;
+
+        case ISIS_TLV_IDRP_INFO:
+	    if (tmp < ISIS_TLV_IDRP_INFO_MINLEN)
+	        break;
+            if (!TTEST2(*tptr, ISIS_TLV_IDRP_INFO_MINLEN))
+                goto trunctlv;
+            printf("\n\t      Inter-Domain Information Type: %s",
+                   tok2str(isis_subtlv_idrp_values,
+                           "Unknown (0x%02x)",
+                           *tptr));
+            switch (*tptr++) {
+            case ISIS_SUBTLV_IDRP_ASN:
+                if (!TTEST2(*tptr, 2)) /* fetch AS number */
+                    goto trunctlv;
+                printf("AS Number: %u",EXTRACT_16BITS(tptr));
+                break;
+            case ISIS_SUBTLV_IDRP_LOCAL:
+            case ISIS_SUBTLV_IDRP_RES:
+            default:
+                if(!print_unknown_data(tptr,"\n\t      ",tlv_len-1))
+                    return(0);
+                break;
+            }
+            break;
+
+        case ISIS_TLV_LSP_BUFFERSIZE:
+	    if (tmp < ISIS_TLV_LSP_BUFFERSIZE_MINLEN)
+	        break;
+            if (!TTEST2(*tptr, ISIS_TLV_LSP_BUFFERSIZE_MINLEN))
+                goto trunctlv;
+            printf("\n\t      LSP Buffersize: %u",EXTRACT_16BITS(tptr));
+            break;
+
+        case ISIS_TLV_PART_DIS:
+            while (tmp >= SYSTEM_ID_LEN) {
+                if (!TTEST2(*tptr, SYSTEM_ID_LEN))
+                    goto trunctlv;
+                printf("\n\t      %s",isis_print_id(tptr,SYSTEM_ID_LEN));
+                tptr+=SYSTEM_ID_LEN;
+                tmp-=SYSTEM_ID_LEN;
+            }
+            break;
+
+        case ISIS_TLV_PREFIX_NEIGH:
+	    if (tmp < sizeof(struct isis_metric_block))
+	        break;
+            if (!TTEST2(*tptr, sizeof(struct isis_metric_block)))
+                goto trunctlv;
+            printf("\n\t      Metric Block");
+            isis_print_metric_block((const struct isis_metric_block *)tptr);
+            tptr+=sizeof(struct isis_metric_block);
+            tmp-=sizeof(struct isis_metric_block);
+
+            while(tmp>0) {
+                if (!TTEST2(*tptr, 1))
+                    goto trunctlv;
+                prefix_len=*tptr++; /* read out prefix length in semioctets*/
+                if (prefix_len < 2) {
+                    printf("\n\t\tAddress: prefix length %u < 2", prefix_len);
+                    break;
+                }
+                tmp--;
+                if (tmp < prefix_len/2)
+                    break;
+                if (!TTEST2(*tptr, prefix_len/2))
+                    goto trunctlv;
+                printf("\n\t\tAddress: %s/%u",
+                       isonsap_string(tptr,prefix_len/2),
+                       prefix_len*4);
+                tptr+=prefix_len/2;
+                tmp-=prefix_len/2;
+            }
+            break;
+
+        case ISIS_TLV_IIH_SEQNR:
+	    if (tmp < ISIS_TLV_IIH_SEQNR_MINLEN)
+	        break;
+            if (!TTEST2(*tptr, ISIS_TLV_IIH_SEQNR_MINLEN)) /* check if four bytes are on the wire */
+                goto trunctlv;
+            printf("\n\t      Sequence number: %u", EXTRACT_32BITS(tptr) );
+            break;
+
+        case ISIS_TLV_VENDOR_PRIVATE:
+	    if (tmp < ISIS_TLV_VENDOR_PRIVATE_MINLEN)
+	        break;
+            if (!TTEST2(*tptr, ISIS_TLV_VENDOR_PRIVATE_MINLEN)) /* check if enough byte for a full oui */
+                goto trunctlv;
+            vendor_id = EXTRACT_24BITS(tptr);
+            printf("\n\t      Vendor: %s (%u)",
+                   tok2str(oui_values,"Unknown",vendor_id),
+                   vendor_id);
+            tptr+=3;
+            tmp-=3;
+            if (tmp > 0) /* hexdump the rest */
+                if(!print_unknown_data(tptr,"\n\t\t",tmp))
+                    return(0);
+            break;
+            /*
+             * FIXME those are the defined TLVs that lack a decoder
+             * you are welcome to contribute code ;-)
+             */
+
+        case ISIS_TLV_DECNET_PHASE4:
+        case ISIS_TLV_LUCENT_PRIVATE:
+        case ISIS_TLV_IPAUTH:
+        case ISIS_TLV_NORTEL_PRIVATE1:
+        case ISIS_TLV_NORTEL_PRIVATE2:
+
+	default:
+            if (vflag <= 1) {
+                if(!print_unknown_data(pptr,"\n\t\t",tlv_len))
+                    return(0);
+            }
+	    break;
+	}
+        /* do we want to see an additionally hexdump ? */
+        if (vflag> 1) {
+	    if(!print_unknown_data(pptr,"\n\t      ",tlv_len))
+	        return(0);
+        }
+
+	pptr += tlv_len;
+	packet_len -= tlv_len;
+    }
+
+    if (packet_len != 0) {
+	printf("\n\t      %u straggler bytes", packet_len);
+    }
+    return (1);
+
+ trunc:
+    fputs("[|isis]", stdout);
+    return (1);
+
+ trunctlv:
+    printf("\n\t\t packet exceeded snapshot");
+    return(1);
+}
+
+/*
+ * Verify the checksum.  See 8473-1, Appendix C, section C.4.
+ */
+
+static int
+osi_cksum(const u_int8_t *tptr, u_int len)
+{
+	int32_t c0 = 0, c1 = 0;
+
+	while ((int)--len >= 0) {
+		c0 += *tptr++;
+		c0 %= 255;
+		c1 += c0;
+		c1 %= 255;
+	}
+	return (c0 | c1);
+}
+
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */