LevelOne GTL-2691 - Manual (Page 546)

C HAPTER 15 | Multicast Filtering
Layer 3 IGMP (Query used with Multicast Routing)
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◆ Request List – Sources included on the router’s request list.
◆ Exclude List – Sources included on the router’s exclude list.
W EB I NTERFACE
To display known MLD multicast groups:
1.
Click Multicast, MLD Snooping, Group Information.
2. Select the port or trunk, and then select a multicast service assigned to
that interface.
Figure 318: Showing IPv6 Multicast Services and Corresponding Sources
L AYER 3 IGMP (Q UERY USED WITH M ULTICAST R OUTING )
IGMP Snooping – IGMP Snooping ( page 515 ) is a key part of the overall set
of functions required to support multicast filtering. It is used to passively
monitor IGMP service requests from multicast clients, and dynamically
configure the switch ports which need to forward multicast traffic.
IGMP Query – Multicast query is used to poll each known multicast group
for active members, and dynamically configure the switch ports which need
to forward multicast traffic. Layer 3 IGMP Query, as described below, is
used in conjunction with both Layer 2 IGMP Snooping and multicast
routing.
IGMP – This protocol includes a form of multicast query specifically
designed to work with multicast routing. A router periodically asks its hosts
if they want to receive multicast traffic. It then propagates service requests
on to any upstream multicast router to ensure that it will continue to
receive the multicast service. IGMP can be enabled for individual VLAN
interfaces ( page 550 ).