3com 5500 User Manual

<Switch A> display igmp-snooping group

Total 1 IP Group(s).

Total 1 MAC Group(s).

Vlan(id):100.

Total 1 IP Group(s).

Total 1 MAC Group(s).

Router port(s):

IP group(s):the following ip group(s) match to one mac group.

IP group address:224.1.1.1

Host port(s):Ethernet1/0/1

MAC group(s):

MAC group address:0100-5e7f-fffe

Host port(s):Ethernet1/0/1 

As shown above, a multicast group entry for the multicast group 224.1.1.1 has 
been created on Switch A, with Ethernet 1/0/1 as the member port. Acting as the 
IGMP Snooping querier, Switch A does not have a router port.

3 View the information on Switch C

# View the IGMP packet statistics on Switch C.

<SwitchC> display igmp-snooping statistics

Received IGMP general query packet(s) number:10.

Received IGMP specific query packet(s) number:0.

Received IGMP V1 report packet(s) number:0.

Received IGMP V2 report packet(s) number:0.

Received IGMP leave packet(s) number:.0

Received error IGMP packet(s) number:0.

Sent IGMP specific query packet(s) number:0. 

Switch C received only IGMP general queries from the querier.

# View the multicast group information on Switch C.

<Switch C> display igmp-snooping group

Total 0 IP Group(s).

Total 0 MAC Group(s).

Vlan(id):100.

Total 0 IP Group(s).

Total 0 MAC Group(s).

Router port(s):Ethernet1/0/1 

As shown above, no multicast entries have been created on Switch C. The switch 
must flood multicast data in the VLAN to allow the multicast data to flow to the 
receivers downstream. Therefore, do not enable the function of dropping 
unknown multicast packets on Switch C.

#

unknown-multicast drop enable

#

igmp-snooping enable

#