User's Manual

System Configuration
102
5
IGMP Settings
This page is used to configure IGMP Proxy, IGMP Snooping, Fast Leave, and
several other IGMP timeout attributes.
Click IGMP. Enable the required IGMP function, modify any of the timeout attributes
as required, and then click Apply.
Figure 5-53 IGMP Settings
Field Attributes
• Enable IGMP Proxy (Router Mode) – Collects and sends multicast group
membership information onto the upstream interface based on IGMP messages
monitored on downstream interfaces, and forwards multicast traffic based on that
information. (Default: Disabled)
• Enable IGMP Snooping – Passively monitors exchanges between attached hosts
and an IGMP-enabled device (most commonly a multicast router) to discover the
ports that want to join a multicast group, and sets its filters accordingly. (Default:
Enabled)
• Enable Fast Leave – Immediately deletes a member port of a multicast service if
a leave packet is received at that port. (Default: Enabled)
If immediate leave is not used, a multicast router (or querier) will send a
group-specific query message when an IGMPv2 group leave message is received.
The router/querier stops forwarding traffic for that group only if no host replies to
the query.
If immediate leave is enabled, the Gateway assumes that only one host is
connected to the interface. Therefore, immediate leave should only be enabled on