Setting Igmp Snooping Status Per Interface - Edge-Core ES3528MV2 Management Manual

| Multicast Filtering
C 17
HAPTER
Layer 2 IGMP (Snooping and Query for IPv4)
S IGMP
ETTING
S S
NOOPING TATUS
I
PER NTERFACE
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 610.
CLI R
EFERENCES
"IGMP Snooping" on page 1204
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C U
OMMAND SAGE
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.
The default values recommended in the MRD draft are implemented
N :
OTE
in the switch.
Multicast Router Discovery uses the following three message types to
discover multicast routers:
Multicast Router Advertisement – Advertisements are sent by routers to
◆
advertise that IP multicast forwarding is enabled. These messages are
sent unsolicited periodically on all router interfaces on which multicast
forwarding is enabled. They are sent upon the occurrence of these
events:
Upon the expiration of a periodic (randomized) timer.
■
As a part of a router's start up procedure.
■
During the restart of a multicast forwarding interface.
■
On receipt of a Solicitation message.
■
◆ Multicast Router Solicitation – Devices send Solicitation messages in
order to solicit Advertisement messages from multicast routers. These
messages are used to discover multicast routers on a directly attached
link. Solicitation messages are also sent whenever a multicast
forwarding interface is initialized or re-initialized. Upon receiving a
solicitation on an interface with IP multicast forwarding and MRD
enabled, a router will respond with an Advertisement.
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