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STP Root Guard Cause STP Topology Change ?

Hi Anyone,

Can anyone please advise if implementing Root Guard on the Root Bridge will cause a STP Topology Change, thus effectively causing a LAN outage because STP reconvergence is required?

 

I need to know this fact so I can decide to implement Root Guard during Business Hours or After Hours.

 

Thank you

Phuc

  • Other Network Infrastructure Subjects
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New Member

It all depends on your

It all depends on your topology and where you apply root guard. I think as long as you're only applying root guard to designated ports you will be ok.

If you apply root guard to a root port, where you would expect BPDUs, the port will stop forwarding.

Root bridge:
All (designated) ports configured for root guard.

STP switches:
All non-root (designated) ports configured for root guard.
 

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