Specifications

712 ExtremeWare XOS 10.1 Command Reference Guide
IP Multicast Commands
enable igmp snooping
enable igmp snooping {forward-mcrouter-only | vlan <name>}
Description
Enables IGMP snooping on the switch.
Syntax Description
Default
Enabled.
Usage Guidelines
If a VLAN is specified, IGMP snooping is enabled only on that VLAN, otherwise IGMP snooping is
enabled on all VLANs.
Two IGMP snooping modes are supported:
• The forward-mcrouter-only mode forwards all multicast traffic to the multicast router (that is, the
router running PIM or DVMRP).
• When not in the forward-mcrouter-only mode, the switch forwards all multicast traffic to any IP
router (multicast or not).
To change the snooping mode you must disable IP multicast forwarding. To disable IP multicast
forwarding, use the command:
disable ipmcforwarding
To change the IGMP snooping mode from the forward-mcrouter-only mode to the
non-
forward-mcrouter-only mode, use the command:
disable igmp snooping forward-mcrouter-only
The snooping mode is not changed from the non-forward-mcrouter-only mode to the
forward-mcrouter-only mode solely by enabling that mode. You must disable IGMP snooping, then
enable IGMP snooping for multicast only. Disable IP multicast forwarding, then use the following
commands:
disable igmp snooping
enable igmp snooping forward-mcrouter-only
Example
The following command enables IGMP snooping on the switch:
enable igmp snooping
forward-mcrouter-only Specifies that the switch forwards all multicast traffic to the multicast router
only.
name Specifies a VLAN.