IGMP Versions
OcNOS supports IGMPv2 and IGMPv3, as well as IGMPv1 report reception. By default, OcNOS enables IGMPv3 when PIM is enabled on an interface.
IGMPv3 includes the following key changes from IGMPv2:
• Support for Source-Specific Multicast (SSM), which builds shortest path trees from each receiver to the source, through the following feature:
• Host messages that can specify both the group and the source.
• The multicast state that is maintained for groups and sources, not just for groups as in IGMPv2.
• Hosts no longer perform report suppression, which means that hosts always send IGMP membership reports when an IGMP query message is received.
Last modified date: 10/20/2023