Enterasys G3G170-24, Справочное руководство CLI

Страница: 336 / 679

Configuring IGMP at Layer 2
10-2 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 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
show igmpsnooping
Use this command to display IGMP snooping information.
Syntax
show igmpsnooping
Parameters
None.
For information about... Refer to page...
show igmpsnooping 10-2
set igmpsnooping adminmode 10-3
set igmpsnooping interfacemode 10-4
set igmpsnooping groupmembershipinterval 10-4
set igmpsnooping maxresponse 10-5
set igmpsnooping mcrtrexpiretime 10-6
set igmpsnooping add-static 10-6
set igmpsnooping remove-static 10-7
show igmpsnooping static 10-7
show igmpsnooping mfdb 10-8
clear igmpsnooping 10-9