About Multicasting; Configuring Igmp At Layer 2; Purpose; Show Igmpsnooping - Enterasys G3G170-24 Cli Reference Manual

Configuring IGMP at Layer 2

About Multicasting

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 G‐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 it to the egress list of the Level 3 interface. It then
propagates the service request on to any neighboring multicast switch/router to ensure that it will
continue to receive the multicast service.
Configuring IGMP at Layer 2

Purpose

To configure IGMP snooping from the switch CLI.
Commands
For information about...

show igmpsnooping

set igmpsnooping adminmode
set igmpsnooping interfacemode
set igmpsnooping groupmembershipinterval
set igmpsnooping maxresponse
set igmpsnooping mcrtrexpiretime
set igmpsnooping add-static
set igmpsnooping remove-static
show igmpsnooping static
show igmpsnooping mfdb
clear igmpsnooping
show igmpsnooping
Use this command to display IGMP snooping information.
Syntax
show igmpsnooping
Parameters
None.
10-2 IGMP Configuration
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