[c-nsp] Effect of IGMP version on IGMP Snooping

[Aaron]

Did you enable IGMPv3 on the switch?

How did you ensure all your hosts were running IGMPv3?

>From memory I had to registry hack the windows hosts to get it to run the
expected version.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of John Neiberger
Sent: Tuesday, 25 January 2011 7:16 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Effect of IGMP version on IGMP Snooping

We have a flat layer two network with IGMP snooping turned on. We are
currently running IGMP v2 everywhere, but we need to enable v3. We
tested this a few nights ago and found that switching to v3 caused a
disruption. Everything started working again after we switched back to
v2. This doesn't make much sense to me.

We have an interface acting as IGMP querier, so snooping seems to be
working. But why would changing IGMP versions cause any disruption?
And why would switching back to v2 suddenly make it work?

If it matters, this is a Cisco 4948 running 12.2(25).
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