3Com 5500G, 4210, 4200G manual Complete Configuration Configuration on Switch a

		Configuring IGMP Snooping Only 141
<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.

3View 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.

Complete Configuration Configuration on Switch A

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unknown-multicast drop enable

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igmp-snooping enable

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