Enable Igmp Snooping - Extreme Networks ExtremeWare XOS Command Reference Manual

ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.

enable igmp snooping

enable igmp snooping {forward-mcrouter-only | vlan <name>}
Description
Enables IGMP snooping on the switch.
Syntax Description
forward-mcrouter-only
name
Default
Enabled.
Usage Guidelines
IGMP snooping is a layer 2 function of the switch. It does not require multicast routing to be enabled.
The feature reduces the flooding of IP multicast traffic. On the VLAN, IGMP snooping optimizes the
usage of network bandwidth and prevents multicast traffic from being flooded to parts of the network
that do not need it. The switch does not reduce any IP multicast traffic in the local multicast domain
(224.0.0.x).
IGMP snooping is enabled by default on the switch. If you are using multicast routing, IGMP snooping
can be enabled or disabled. If IGMP snooping is disabled, all IGMP and IP multicast traffic floods
within a given VLAN.
If a VLAN is specified, IGMP snooping is enabled only on that VLAN, otherwise IGMP snooping is
enabled on all VLANs.
This command applies to both IGMPv2 and IGMPv3.
An optional optimization for IGMP snooping is the strict recognition of routers only if the remote
devices are running a multicast protocol. 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), and any active member port to the local network that has one or more
subscribers.
NOTE
The forward-mcrouter-only mode for IGMP snooping is enabled/disabled on a switch-wide basis, not on a per-VLAN
basis. In other words, all the interfaces enabled for IGMP snooping are either in the forward-mcrouter-only mode or
in the non-forward-mcrouter-only mode, and not a mixture of the two modes.
ExtremeWare XOS 11.5 Command Reference Guide
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
enable igmp snooping
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