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Changing the IGMP Version

By default, the routing device runs IGMPv2. Routing devices running different versions of IGMP determine the lowest common version of IGMP that is supported by hosts on their subnet and operate in that version.

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

If a static multicast group is configured with the source address defined, and the IGMP version is configured to be version 2, the source is ignored and only the group is added. In this case, the join is treated as an IGMPv2 group join.

If you configure the IGMP version setting at the individual interface hierarchy level, it overrides the interface all statement.

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

To change to IGMPv3 for SSM functionality:

  1. Configure the IGMP interface.
    [edit protocols igmp]user@host# set interface ge-0/0/0 version 3
  2. Verify the configuration by checking the version field in the output of the show igmp interfaces command. The show igmp statistics command has version-specific output fields, such as V1 Membership Report, V2 Membership Report, and V3 Membership Report.
 

Related Documentation

 

Published: 2012-06-29

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