Multicast Topology change problem

[fatonk]

Hello,

I have a Cisco 3560 Switch configured in ip igmp snooping querier mode, since multicast traffic doesn't need to be routed but switched at L2.
I have another 3560 switch setup as a backup, the maximum multicast traffic reaches 540 Mbit/s. My problem is that when topology change occurs it saturates the quality of video stream (picture) for few seconds until the new multicast forwarding table is converged. I have tried to tweak TCN Flooding (even stoped flooding) but while topology change occurs it stops sending video stream until the convergence is reached. Does anyone has an idea how to tweak the multicast traffic from saturating the link.

Regards

Faton

 

[fatonk]

I see, no way to solve it at L2, the router should be setup.

 

[burtsbees]

Do you have PIM s/d mode set up in the 3560? What IOS?

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[fatonk]

No PIM enabled, 3560 is configured as L2 Switch no routing is enabled, I think that spanning-tree portfast should solve the problem, since it will supress Topology changes.

 

[burtsbees]

For STP, but not for any routing protocols...that is for any other devices (L3) involved, that is...

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