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bpdu's

carl_townshend
Frequent Contributor
Frequent Contributor

Hi all, if I enable bpdu guard on my switch does this stop the switch using another root ?

3 Replies 3

Ahmede
Beginner
Beginner

PBDU gurad will disable any port configured as "portfast" when it receives BPDU on that port.

devang_etcom
Rising star
Rising star

The STP PortFast BPDU guard enhancement allows network designers to enforce the STP domain borders and keep the active topology predictable. The devices behind the ports that have STP PortFast enabled are not able to influence the STP topology. At the reception of BPDUs, the BPDU guard operation disables the port that has PortFast configured.

http://www.sysadminnews.com/sysadminnews-32-20060413ConfiguringPortFastAndBPDUGuard.html

rate this post if it helps

regards

Devang

Francois Tallet
Rising star
Rising star

Yes, as a side effect of shutting down the port as soon it receives a bpdu;-)

There is a related feature called "root guard", that will block a port if it receives better information (spanning-tree guard root). Configure it on ports you don't ever want to become root port. Be careful that it's rather a security policy enforcement to be configured on port for which it would not be appropriate to become root port (like a port connecting to an end user). Don't use this kind of feature to select your root port among a group of candidate.

Regards,

Francois

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