Igmp Configuration Summary; Enabling / Disabling Igmp; Purpose; Commands - Enterasys Matrix DFE-Gold Series Configuration Manual

IGMP Configuration Summary

However, note that IGMP neither alters nor routes any IP multicast packets. Since IGMP is not
concerned with the delivery of IP multicast packets across subnetworks, an external IP multicast
switch device is needed if IP multicast packets have to be routed across different subnetworks.
IGMP Configuration Summary
Multicasting is used to support real‐time applications such as video conferences or streaming
audio. A multicast server does not have to establish a separate connection with each client. It
merely broadcasts its service to the network, and any hosts that want to receive the multicast
register with their local multicast switch/router. Although this approach reduces the network
overhead required by a multicast server, the broadcast traffic must be carefully pruned at every
multicast switch/router it passes through to ensure that traffic is only passed to the hosts that
subscribed to this service.
The Enterasys Matrix Series switch device uses IGMP (Internet Group Management Protocol) to
query for any attached hosts who want to receive a specific multicast service. The device looks up
the IP Multicast Group used for this service and adds any port that received a similar request to
that group. It then propagates the service request on to any neighboring multicast switch/router to
ensure that it will continue to receive the multicast service.

Enabling / Disabling IGMP

Purpose

To display IGMP information and to enable or disable IGMP snooping on the device.

Commands

For information about...

show igmp enable

set igmp enable
set igmp disable
show igmp enable
Use this command to display the status of IGMP on one or more VLAN(s).
Syntax
show igmp enable vlan-list
Parameters
vlan‐list
Defaults
None.
9-2 IGMP Configuration
Specifies the VLAN(s) for which to display IGMP status.
show igmp enable
Refer to page...
9-2
9-3
9-3