User guide

IGMP snooping Functional Overview (Includes New Functionality) IGMP snooping
3-5
iMG/RG Software Reference Manual (IGMP)
FIGURE 3-1 IGMP messages flow when Snoop-Only mode is active
3.1.2.2.1 Joining a Multicast Group
The Residential Gateway detects unsolicited IGMP Report messages that hosts send to join a multicast channel.
The Residential Gateway updates the local multicast group database storing the information about the
requested stream and the requesting port.
The IGMP process then forwards immediately the IGMP Report message to the multicast router.
Local igmp entries can be displayed via the bridge list igmpsnooping groupinfo command.
As soon the multicast router opens the multicast stream towards the Residential Gateway, the port that
requested that stream starts to receive it.