3Com 4210, 5500G, 4200G manual Configuration on Switch B, Configuration on Switch C

142CHAPTER 16: MULTICAST CONFIGURATION GUIDE

vlan 100 igmp-snooping enable igmp-snooping querier

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interface Ethernet1/0/1 port access vlan 100

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interface Ethernet1/0/2 port access vlan 100

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Configuration on Switch B

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unknown-multicast drop enable

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igmp-snooping enable

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vlan 100 igmp-snooping enable

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interface Ethernet1/0/1 port access vlan 100

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interface Ethernet1/0/2 port access vlan 100

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interface Ethernet1/0/3 port access vlan 100

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Configuration on Switch C

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igmp-snooping enable

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vlan 100 igmp-snooping enable

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interface Ethernet1/0/1 port access vlan 100

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interface Ethernet1/0/2 port access vlan 100

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interface Ethernet1/0/3 port access vlan 100

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Configuring Multicast In the traditional multicast-on-demand mode, when users in different VLANs on a

VLANLayer 2 device need multicast information, the multicast router needs to forward a separate copy of the multicast data to each of these VLANs. This mode wastes a great deal of bandwidth.

With the multicast VLAN feature, you can configure a VLAN as the multicast

VLAN, which can be used to transmit multicast traffic to users in different VLANs.