Web Management Guide-R06

Table Of Contents
Chapter 14
| Multicast Filtering
Layer 3 IGMP (Query used with Multicast Routing)
– 581 –
Web Interface
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 367: Showing IPv6 Multicast Services and Corresponding Sources
Layer 3 IGMP (Query used with Multicast Routing)
IGMP Snooping – IGMP Snooping (page 548) 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 585).
Note:
Multicast Routing Discovery (MRD) is used to discover which interfaces are
attached to multicast routers. (For a description of this protocol, see “Multicast