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New Member

spanning tree multicast

hi

My question is:

if i have three switchs A B and C, and they have default configuration, except on all port of this three switches I have comand

block multicast

and I made a loop

       A

   /       \

B---------C

Is my STP bpdu will pass through all ports and STP block the loop or not?

2 REPLIES
Cisco Employee

spanning tree multicast

Hello,

A very good question indeed. The multicast block applies only to transit unknown multicast traffic. STP should not be limited in any way by this block. In other words, for STP, nothing will change and it will continue to work as expected.

Best regards,

Peter

New Member

spanning tree multicast

but what is transit traffic?

for switch C for example BPDU from A  will be transit traffic

and what is unknown?

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