2-20
Displaying and Maintaining IGMP Snooping
To do... Use the command... Remarks
Display IGMP snooping multicast
group information (on a centralized
device)
display igmp-snooping group [ vlan
vlan-id ] [ verbose ]
Available in
any view
Display the statistics information of
IGMP messages learned by IGMP
snooping
display igmp-snooping statistics
Available in
any view
Clear IGMP snooping multicast
group information
reset igmp-snooping group
{ group-address | all } [ vlan vlan-id ]
Available in
user view
Clear the statistics information of all
kinds of IGMP messages learned
by IGMP snooping
reset igmp-snooping statistics
Available in
user view
z The reset igmp-snooping group command works only on an IGMP snooping–enabled VLAN.
z The reset igmp-snooping group command cannot clear the IGMP snooping multicast group
information for static joins.
IGMP Snooping Configuration Examples
Group Policy and Simulated Joining Configuration Example
Network requirements
z As shown in Figure 2-4, Router A connects to the multicast source through GigabitEthernet 1/0/2
and to Switch A through GigabitEthernet 1/0/1.
z IGMPv2 is required on Router A, IGMP snooping version 2 is required on Switch A, and Router A
will act as the IGMP querier on the subnet.
z It is required that the receivers, Host A and Host B, attached to Switch A can receive multicast
traffic addressed to multicast group 224.1.1.1 only.
z It is required that multicast data for group 224.1.1.1 can be forwarded through GigabitEthernet
1/0/3 and GigabitEthernet 1/0/4 of Switch A even if Host A and Host B accidentally, temporarily
stop receiving multicast data.
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