31.3 IGMP snooping
The following explains IGMP snooping functionality and its operation. The format and timers for IGMP messages sent and received by the Switch conform to RFC 2236. Also, the format and values set for IGMP version 3 (abbreviated hereafter to IGMPv3) messages conform to RFC 3376.
If IGMP snooping is not used at the same time as IPv4 multicast or IPv6 multicast, the MAC address control method is used to control forwarding for multicast traffic. If IGMP snooping is used at the same time as IPv4 multicast or IPv6 multicast, the IP address control method is used to control forwarding for multicast traffic.