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If IGMP snooping is configured on some of the interfaces, there is a greater chance that multicast information transfers may be interrupted. IGMP proxy must be enabled or disabled on each individual interface. To use the IGMP proxy ensure that the VLANs on the controllers are extended to the upstream router.
On 4948 or 3560 I can disable igmp snooping in a specific VLAN: sw4948(config)#no ip igmp snooping vlan ? <1-1001> Vlan number <1006-4094> Vlan number. sw4948(config)#no ip igmp snooping vlan 10 ? explicit-tracking Enable IGMP explicit host tracking. immediate-leave Enable IGMPv2 immediate leave processing
IGMP snooping relies on listening to (snooping) passing IGMP packets. These packets contain information on which multicast groups the PC wants to join. The switch is then able to make a decision on which ports to send multicast traffic for the group to and which ones to block. Now consider a group where IGMP is not operating.
IGMP Snooping for Optimized Multimedia Traffic Delivery By listening in on the IGMP conversation between hosts and routers, the Gigabit Web Managed (Plus) switch can maintain a map as to which links need which IP multicast streams.
Nov 20, 2020 · Internet Group Management Protocol (IGMP; Defined in RFC 1112) is a protocol that allows a host to advertise its multicast group membership to neighboring switches and routers. IGMP is a standard protocol used by the TCP/IP protocol suite to achieve dynamic multicasting.