C
HAPTER
39
| Multicast Filtering Commands
IGMP Snooping
– 916 –
COMMAND MODE
Global Configuration
COMMAND USAGE
â—† Multicast Router Discovery (MRD) uses multicast router advertisement,
multicast router solicitation, and multicast router termination messages
to discover multicast routers. 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.
â—† 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 expiration of a periodic timer, as a part of a router's
start up procedure, during the restart of a multicast forwarding
interface, and on receipt of a solicitation message. When the multicast
services provided to a VLAN is relatively stable, the use of solicitation
messages is not required and may be disabled using the no ip igmp
snooping vlan mrd command.
â—† This command may also be used to disable multicast router solicitation
messages when the upstream router does not support MRD, to reduce
the loading on a busy upstream router, or when IGMP snooping is
disabled in a VLAN.
EXAMPLE
This example disables sending of multicast router solicitation messages on
VLAN 1.
Console(config)#no ip igmp snooping vlan 1 mrd
Console(config)#
ip igmp snooping
vlan proxy-address
This command configures a static source address for locally generated
query and report messages used by IGMP proxy reporting. Use the no form
to restore the default source address.
SYNTAX
[no] ip igmp snooping vlan vlan-id proxy-address source-address
vlan-id - VLAN ID (Range: 1-4093)
source-address - The source address used for proxied IGMP query
and report, and leave messages. (Any valid IP unicast address)
DEFAULT SETTING
0.0.0.0
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