Multicast Routing and IGMP Snooping

In this example, ports 1/g5 and 1/g10 are members of VLAN 100, and port 1/g15 is a member of VLAN

200.Both VLANs are configured as VLAN routing interfaces and are in different subnets. IGMP snooping is configured on VLAN 100 so that a member port will receive multicast data only if it sends an IMGP join message for that multicast group. IGMP and PIM-DM are enabled on each VLAN so that multicast data sent from a port on VLAN 200 can be routed to VLAN 100.

NOTE: If multicast routing and IGMP snooping are configured on the same switch, do not use the commands bridge multicast filtering forward-allor bridge multicast filtering forbidden on the VLAN interfaces. These commands should be used in IGMP Snooping configurations only.

1Create VLANs 100 and 200.

console#configure console(config)#vlan database console(config-vlan)#vlan 100,200

2Enable IGMP snooping on VLAN 100.

console(config-vlan)#ip igmp snooping 100 console(config-vlan)#exit

3Enable routing on the switch. console(config)#ip routing

4Configure VLAN 100 as a VLAN routing interface and assign an IP address and subnet mask.

console(config)#interface vlan 100 console(config-if-vlan100)#routing

console(config-if-vlan100)#ip address 10.10.10.1 255.255.255.0

5Enable IGMP and PIM-DM on the VLAN routing interface

console(config-if-vlan100)#ip igmp console(config-if-vlan100)#ip pimdm

NOTE: When you enable PIM-DM on the VLAN routing interface, PIM-SM is automatically enabled. This is a known limitation. Only one multicast routing protocol can be enabled globally on the switch at a time, so the PIM mode that is enabled globally is the PIM mode that is active on the interface.

6Configure VLAN 200 as a VLAN routing interface and assign an IP address and subnet mask.

console(config)#interface vlan 200 console(config-if-vlan200)#routing

console(config-if-vlan200)#ip address 20.20.20.1 255.255.255.0

7Enable IGMP and PIM-DM on the VLAN routing interface

console(config-if-vlan200)#ip igmp console(config-if-vlan200)#ip pimdm

Multicast

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