H3C Technologies H3C S12500 Series Switches - Manual (Page 48)

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Task Command Remarks
Display information about IGMP
snooping groups (in IRF mode).
display igmp-snooping group [ vlan vlan-id ]
[ chassis chassis-number slot slot-number ]
[ verbose ] [ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display information about the hosts
tracked by IGMP snooping (in
standalone mode).
display igmp-snooping host vlan vlan-id group
group-address [ source source-address ] [ slot
slot-number ] [ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display information about the hosts
tracked by IGMP snooping (in IRF
mode).
display igmp-snooping host vlan vlan-id group
group-address [ source source-address ]
[ chassis chassis-number slot slot-number ] [ |
{ begin | exclude | include }
regular-expression ]
Available in any view.
Display the statistics for IGMP
messages learned through IGMP
snooping.
display igmp-snooping statistics [ | { begin |
exclude | include } regular-expression ]
Available in any view.
Remove all the dynamic group
entries of an IGMP snooping group
or all IGMP snooping groups.
reset igmp-snooping group { group-address |
all } [ vlan vlan-id ] Available in user
view.
Clear the statistics for all IGMP
messages learned through IGMP
snooping.
reset igmp-snooping statistics
Available in user
view.
IGMP snooping configuration examples
IMPORTANT:
By default, Ethernet interfaces, VLAN interfaces, and aggregate interfaces are in the state of DOWN. To
configure such an interface, use the undo shutdown commands to bring it up first.
Group policy and simulated joining configuration example
Network requirements
As shown in Figure 14 , IGMPv2 runs on Router A, IGMPv2 snooping runs on Device A, and Router A acts
as the IGMP querier on the subnet.
The receivers (Host A and Host B) can receive multicast traffic only addressed to multicast group 224.1.1.1.
Multicast data for group 224.1.1.1 can be forwarded through GigabitEthernet 3/0/3 and
GigabitEthernet 3/0/4 of Device A even if Host A and Host B temporarily stop receiving multicast data.
Device A drops unknown multicast data and does not broadcast the data to the VLAN where Device A
resides.