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Command mode: Interface Mode
Usage Guide: This command is used to provide forward compatibility between different
versions. It should be noted that v1 and v2 are not interconnectable, and the
same version of IGMP must be ensured for the same network.
Example: Configure the IGMP running on the interface to version 1.
Switch (Config)#interface vlan 1
Switch(Config-If-Vlan1)#ip igmp version 1
16.6.3 Typical IGMP Scenario
As shown in the figure below, the Ethernet interfaces of SwitchA and SwitchB are added
to the appropriate vlan, and PIM-DM protocol is enabled on each vlan interface.
SWITCHA
SWITCHB
Et her net 1/ 1
vl an1
Et her net 1/ 1
vl an1
Et her net 1/ 2
vl an2
Fig 16-4 IGMP network topology
The followings are the configurations of SwitchA and SwitchB.
(1) Configuration of SWITCHA:
Switch (Config)#interface vlan 1
Switch(Config-If-Vlan1)#ip pim dense-mode
(2) Configuration of SWITCHB:
Switch(Config)#interface vlan1
Switch(Config-If-Vlan1)#ip pim dense-mode
Switch(Config-If-Vlan1)#exit
Switch(Config)#interface vlan2
Switch(Config-If-Vlan2)#ip pim dense-mode
Switch(Config-If-Vlan2)#ip igmp version 1
Switch(Config-If-Vlan2)#ip igmp query-timeout 150
16.6.4 IGMP Troubleshooting Help