Setting Igmp Snooping Status Per Interface - Edge-Core ES3510MA-DC Management Manual

Layer 2 switch with 8 10/100base-tx rj-45 ports, and 2 gigabit combination ports rj-45/sfp
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C
18
HAPTER
Layer 2 IGMP (Snooping and Query)
S
IGMP
ETTING
S
S
NOOPING
TATUS
I
PER
NTERFACE
Use the Multicast > IGMP Snooping > Interface (Configure) page to
configure IGMP snooping attributes for a VLAN interface. To configure
snooping globally, refer to
Parameters" on page
456.
CLI R
EFERENCES
"IGMP Snooping" on page 895
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.
– 464 –
"Configuring IGMP Snooping and Query

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