3Com 4210 9-Port - IGMP Snooping Configuration Examples; Configuring IGMP Snooping

2-16
You can execute the reset command in user view to clear the statistics information about IGMP
Snooping.
Table 2-20 Display and maintain IGMP Snooping
Operation Command Remarks
Display the current IGMP
Snooping configuration
display igmp-snooping
configuration
Display IGMP Snooping
message statistics
display igmp-snooping
statistics
Display the information about
IP and MAC multicast groups in
one or all VLANs
display igmp-snooping
group [ vlan vlanid ]
You can execute the display
commands in any view.
Clear IGMP Snooping statistics
reset igmp-snooping
statistics
You can execute the reset
command in user view.
IGMP Snooping Configuration Examples
Configuring IGMP Snooping
Network requirements
To prevent multicast traffic from being flooded at Layer 2, enable IGMP snooping on Layer 2 switches.
z As shown in Figure 2-3, Router A connects to a multicast source (Source) through Ethernet1/0/2,
and to Switch A through Ethernet1/0/1.
z Run PIM-DM and IGMP on Router A. Run IGMP snooping on Switch A. Router A acts as the IGMP
querier.
z The multicast source sends multicast data to the multicast group 224.1.1.1. Host A and Host B are
receivers of the multicast group 224.1.1.1.
Network diagram
Figure 2-3 Network diagram for IGMP Snooping configuration
Multicast packets
Source
Router A Switch A
Receiver
Receiver
Host B
Host A
Host C
1.1.1.1/24
Eth1/0/4
Eth1/0/2
Eth1/0/3
IGMP querier
Eth1/0/1
Eth1/0/1
10.1.1.1/24
Eth1/0/2
1.1.1.2/24
VLAN100