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New Member

multicast

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

5 REPLIES
Cisco Employee

Re: multicast

Carl,

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

(globally)

no ip igmp snooping

(per vlan)

no ip igmp snooping vlan xxx

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: multicast

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 ?

Hall of Fame Super Silver

Re: multicast

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

Giuseppe

New Member

Re: multicast

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.

Super Bronze

Re: multicast

Many switches that support IGMP snooping will act as an IGMP Snooping Querier, if enabled.

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