Web Management Guide

Table Of Contents
Chapter 13
| Multicast Filtering
Layer 2 IGMP (Snooping and Query for IPv4)
– 445
To show the all interfaces attached to a multicast router:
1.
Click Multicast, IGMP Snooping, Multicast Router.
2.
Select Current Multicast Router from the Action list.
3.
Select the VLAN for which to display this information. Ports in the selected
VLAN which are attached to a neighboring multicast router/switch are
displayed.
Figure 278: Showing Current Interfaces Attached a Multicast Router
Setting IGMP
Snooping Status per
Interface
Use the Multicast > IGMP Snooping > Interface (Configure VLAN) page to configure
IGMP snooping attributes for a VLAN. To configure snooping globally, refer to
“Configuring IGMP Snooping and Query Parameters” on page 437.
Command Usage
Multicast Router Discovery
There have been many mechanisms used in the past to identify multicast routers.
This has lead to interoperability issues between multicast routers and snooping
switches from different vendors. In response to this problem, the Multicast Router
Discovery (MRD) protocol has been developed for use by IGMP snooping and
multicast routing devices. MRD is used to discover which interfaces are attached to
multicast routers, allowing IGMP-enabled devices to determine where to send
multicast source and group membership messages. (MRD is specified in draft-ietf-
magma-mrdisc-07.)
Multicast source data and group membership reports must be received by all
multicast routers on a segment. Using the group membership protocol query
messages to discover multicast routers is insufficient due to query suppression.
MRD therefore provides a standardized way to identify multicast routers without
relying on any particular multicast routing protocol.
Note:
The default values recommended in the MRD draft are implemented in the
switch.