tree 3b51f10fa3e17cb734daba83b94d7466ac348a67
parent cd7537326e617e71b5a84b205b755bc86bee8d06
author stephen hemminger <shemminger@vyatta.com> 1352793187 +0000
committer David S. Miller <davem@davemloft.net> 1352942444 -0500

bridge: implement BPDU blocking

This is Linux bridge implementation of STP protection
(Cisco BPDU guard/Juniper BPDU block). BPDU block disables
the bridge port if a STP BPDU packet is received.

Why would you want to do this?
If running Spanning Tree on bridge, hostile devices on the network
may send BPDU and cause network failure. Enabling bpdu block
will detect and stop this.

How to recover the port?
The port will be restarted if link is brought down, or
removed and reattached.  For example:
 # ip li set dev eth0 down; ip li set dev eth0 up

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>