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43.10.3 IGMP Snooping Examples
Scenario 1: IGMP Snooping function
Multicast router
Multicast Server 1
Multicast Server 2
Multicast port
IGMP Snooping
Group 1
Group 1
Group 1
Group 2
Enabling IGMP Snooping function
Figure 43-10-1
Example: As shown in the above figure, a VLA N 100 is configured in the switch and includes ports 1, 2, 6, 10
and 12. Four hosts are connected to port 2, 6, 10, 12 respectively and the multicast router is connected to port
1. As IGMP Snooping is disabled by default either in the switch or in the VLA Ns, If IGMP Snooping should be
enabled in VLAN 100, the IGMP Snooping should be first enabled for the switch in Global Mode and in VLA N
100 and set port 1 of VLA N 100 to be the mrouter port.
The configuration steps are listed below:
XGS 3-42000R(config)#ip igmp snooping
XGS 3-42000R(config)#ip igmp snooping vlan 100
XGS 3-42000R(config)#ip igmp snooping vlan 100 mrouter int erface ethernet 1/1
Multicast Configuration
Suppose two programs are provided in the Multicast Server using multicast address Group1 and Group2,
three of four hosts running multicast applications are connected to port 2, 6, 10 plays program1, while the host
is connected to port 12 plays program 2.
IGMP Snooping listening resul t:
The multicast table built by IGMP Snooping in VLA N 100 indicates ports 1, 2, 6, 10 in Group1 and ports 1, 12
in Group2.
All the four hosts can receive the program of their choice: ports 2, 6, 10 will not receive the traffic of program 2
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