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bridge: implement BPDU blocking

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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>
This commit is contained in:
stephen hemminger
2012-11-13 07:53:07 +00:00
committed by David S. Miller
parent cd7537326e
commit a2e01a65cd
5 changed files with 16 additions and 1 deletions
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1
include/uapi/linux/if_link.h
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@@ -216,6 +216,7 @@ enum {
IFLA_BRPORT_PRIORITY, /* " priority */
IFLA_BRPORT_COST, /* " cost */
IFLA_BRPORT_MODE, /* mode (hairpin) */
IFLA_BRPORT_GUARD, /* bpdu guard */
__IFLA_BRPORT_MAX
};
#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)