Users Guide

510 Dell PowerConnect 55xx Systems User Guide
IGMP
Internet Group Multicast Protocol (IGMP) adds IGMP packets to Multicast
traffic. When IGMP Snooping is enabled globally, all IGMP packets are
forwarded to the CPU. The CPU analyzes the incoming packets and
determines:
• Which ports want to join which Multicast groups.
• Which ports have Multicast routers generating IGMP queries.
• What routing protocols are forwarding packets and Multicast traffic.
Ports requesting to join a specific Multicast group issue an IGMP report,
specifying that the Multicast group is accepting members. This results in the
creation of an entry in the Multicast filtering database.