Ip Igmp Snooping Vlan Mrd - Edge-Core ECS4810-12M Layer 2 Management Manual

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IGMP Snooping

ip igmp snooping

When a multicast host leaves a group, it sends an IGMP leave message.

When the leave message is received by the switch, it checks to see if

this host is the last to leave the group by sending out an IGMP group-

specific or group-and-source-specific query message, and starts a

timer. If no reports are received before the timer expires, the group

record is deleted, and a report is sent to the upstream multicast router.

A reduced value will result in reduced time to detect the loss of the last

member of a group or source, but may generate more bursty traffic.

This command will take effect only if IGMP snooping proxy reporting is

Console(config)#ip igmp snooping vlan 1 last-memb-query-intvl 700

Console(config)#

This command enables sending of multicast router solicitation messages.

Use the no form to disable these messages.

[no] ip igmp snooping vlan vlan-id mrd

vlan-id - VLAN ID (Range: 1-4093)

Global Configuration

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.

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

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