Unanswered Question
Apr 27th, 2009

Hi all, is IGMP snooping enabled by default on cisco switches, also do they use IGMP proxy function?

If so how do I turn these functions off / on

I have this problem too.
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Harold Ritter Mon, 04/27/2009 - 09:56


IGMP snooping is enabled by default. IGMP proxy is not. To disable IGMP snooping:


no ip igmp snooping

(per vlan)

no ip igmp snooping vlan xxx


carl_townshend Tue, 04/28/2009 - 00:26

should this be turned off then? or should I leave it on? How can I check the group to port assignments ?

also what benefit is IGMP snooping and IGMP proxy ?

Giuseppe Larosa Tue, 04/28/2009 - 03:44

Hello Carl,

as we discussed in another thread it is a question of implementation:

on switches supporting IGMP snooping in HW using an ASIC it is good to have it enabled.

Hope to help


aciscolook Wed, 05/13/2009 - 15:29

what if i use igmp snooping to constrain multicast traffic but don't have a router in the mix. Will this work?

Again, just one (maybe two) switch with IGMP snooping and no router.


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