IGMP

Addresses

• 224.0.0.0/4 for IPv4

• FF00::/8 for IPv6

IGMP (IP Multicast Group Membership Protocols) and MLD (Multicast Listener Discovery)

IGMPv2/MLDv1

• Used in ASM (Any Source Multicast) deployment

• Receiver cannot specify which source to receive multicast

• IGMPv2 default on NX-OS

IGMPv3/MLDv2

• Used in SSM (Source Specific Multicast) deployment

• Receiver specifies a list of sources to receive from

• MLDv2 default on NX-OS

Note on Nexus Switches

• Nexus starts IGMP and MLD automatically. Can't enable IGMP and MLD individually per interface

• Nexus automatically enables IGMP when PIM is activated and MLD when PIM6 is activated on an interface

Configuration and Verification

Verfication

• show ip igmp membership