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Changing the IGMP Version

By default, the router runs IGMPv2. To change to IGMPv3 (for source-specific multicast [SSM] functionality), include the version statement:




version 3;

You can include this statement at the following hierarchy levels:

[edit protocols igmp interface interface-name]
[edit logical-systems logical-system-name protocols igmp interface interface-name]

To enable SSM functionality, you must configure version 3 on the host and the host’s directly connected router. If a source address is specified in a multicast group that is statically configured, the version must be set to IGMPv3.

Note: Routers running different versions of IGMP negotiate the lowest common version of IGMP that is supported by hosts on their subnet and operate in that version.

If you have already configured the router to use IGMP version 1 (IGMPv1) and then configure it to use IGMPv2, the router continues to use IGMPv1 for up to 6 minutes and then uses IGMPv2.

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