Stateful switchover (SSO) and IGMP snooping on 4500 switch
Hello all! I am testing stateful switchover on 4500 switch, and ran into issues with IGMP snooping and multicast.
I have a simple lab setup with two hosts connecting to the same 4500 switch, same blade. They are sending packets to each other at a regular rate, and I can measure the timeout during the sup switchover. IGMP snooping is enabled, and IGMP querier is configured on the switch. No routing is involved, same VLAN. Redundancy mode is SSO.
For unicast, I see 15-20 ms timeout, which is pretty good. For multicast, the timeout is anywhere between 2 and 10 seconds. I got same results with SUP 6E and 7E, up to date IOS versions.
So my questions are: Is this a typical behavior for the 4500 platform? is there any configuration that can improve the switchover time? My expectation was under a second failover for multicast, because of "Stateful IGMP snooping" feature.
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