Configuring IGMP at Layer 2
17-2 IGMP Configuration
In addition to passively monitoring IGMP query and report messages, the Enterasys C3 can also
actively send L3 IGMP query messages to learn locations of multicast devices and member hosts
in multicast groups within each VLAN.
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, multicast routing is
needed if IP multicast packets have to be routed across different subnetworks.
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.
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 17-2
set igmpsnooping adminmode 17-3
set igmpsnooping interfacemode 17-4
set igmpsnooping groupmembershipinterval 17-4
set igmpsnooping maxresponse 17-5
set igmpsnooping mcrtrexpiretime 17-6
set igmpsnooping add-static 17-6
set igmpsnooping remove-static 17-7
show igmpsnooping static 17-7
show igmpsnooping mfdb 17-8
clear igmpsnooping 17-9
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