Enterasys SecureStack C2, Configuration Manual, Page: 348 / 607

Configuring IGMP at Layer 2
11-2 IGMP Configuration
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 SecureStack C2 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.
Configuring IGMP at Layer 2
Purpose
To configure IGMP snooping from the switch CLI.
Commands
show igmpsnooping
Use this command to display IGMP snooping information.
Syntax
show igmpsnooping
For information about... Refer to page...
show igmpsnooping 11-2
set igmpsnooping adminmode 11-3
set igmpsnooping interfacemode 11-4
set igmpsnooping groupmembershipinterval 11-4
set igmpsnooping maxresponse 11-5
set igmpsnooping mcrtrexpiretime 11-5
set igmpsnooping add-static 11-6
set igmpsnooping remove-static 11-7
show igmpsnooping static 11-7
show igmpsnooping mfdb 11-8
clear igmpsnooping 11-8