Enable Igmp Snooping - Extreme Networks ExtremeWare Command Reference Manual

IP Multicast Commands

enable igmp snooping

enable igmp snooping {forward-mcrouter-only | vlan <vlan name>}
Description
Enables IGMP snooping on the switch.
Syntax Description
forward-mcrouter-only
vlan name
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
router running PIM or DVMRP).
• When not in the
forward-mcrouter-only
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
non-
forward-mcrouter-only
disable igmp snooping forward-mcrouter-only
The snooping mode is not changed from the non-
forward-mcrouter-only
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
1992
Specifies that the switch forwards all multicast traffic to the multicast router
only.
Specifies a VLAN.
mode forwards all multicast traffic to the multicast router (that is, the
mode, the switch forwards all multicast traffic to any IP
forward-mcrouter-only
mode, use the command:
forward-mcrouter-only
mode solely by enabling that mode. You must disable IGMP snooping, then
mode to the
mode to the
ExtremeWare 7.5 Command Reference Guide