Name: Cisco Catalyst 2960 Series
Brand: Cisco
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This output shows a querier for VLAN 1 and 401 with their queries reaching the switch through

GigabitEthernet1/0/11:

Switch# show ip igmp snooping querier

Vlan IP Address IGMP Version Port

-------------------------------------------------------------

1 1.1.1.1 v2 Gi1/0/11

401 41.41.41.1 v2 Gi1/0/11

This is output for the show ip igmp snooping mrouter command for VLAN 1 and 401:

Switch# show ip igmp snooping mrouter

Vlan ports

---- -----

1 Gi1/0/11(dynamic), Gi1/0/12(dynamic)

401 Gi1/0/11(dynamic), Gi1/0/12(dynamic)

Similarly, both the Flex Links ports are a part of the learned groups. In this example, GigabitEthernet2/0/11

is a receiver/host in VLAN 1, which is interested in two multicast groups:

Switch# show ip igmp snooping groups

Vlan Group Type Version Port List

-----------------------------------------------------------------------

1 228.1.5.1 igmp v2 Gi1/0/11, Gi1/0/12, Gi2/0/11

1 228.1.5.2 igmp v2 Gi1/0/11, Gi1/0/12, Gi2/0/11

Whenever a host responds to the general query, the switch forwards this report on all the mrouter ports. When

you turn on this feature through the command-line port, and when a report is forwarded by the switch on

GigabitEthernet1/0/11, it is also leaked to the backup port GigabitEthernet1/0/12. The upstream router learns

the groups and starts forwarding multicast data, which is dropped at the ingress because GigabitEthernet1/0/12

is blocked. When the active link, GigabitEthernet1/0/11, goes down, the backup port, GigabitEthernet1/0/12,

begins forwarding. You do not need to send any proxy reports as the multicast data is already being forwarded

by the upstream router. By leaking reports to the backup port, a redundant multicast path has been set up, and

the time taken for the multicast traffic convergence is very minimal.

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