Ip igmp snooping – Allied Telesis AT-DC2552XS User Manual
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AT-DC2552SX Switch Command Line Interface User’s Guide
429
IP IGMP SNOOPING
Syntax
ip igmp snooping
Parameters
None
Mode
Global Configuration mode
Description
Use this command to enable IGMP snooping on the switch. IGMP
snooping allows the switch to examine the contents of packets (sent
between hosts and routers) and filter multicast packets. Without IGMP, the
switch floods multicast packets to all the hosts that belong to a VLAN even
if only one host in the VLAN is a recipient of the multicast packet. By
default, IGMP snooping is enabled.
When IGMP snooping is enabled, the switch does not apply hardware
ACLs and policy maps to IGMP packets.
The switch supports jumbo frames up to 12,292 bytes; however, when
IGMP snooping is enabled, the ports discard:
Frames with VLAN tags larger than 1,518 bytes
Frames without VLAN tags larger than 1,522 bytes
Confirmation Command
Example
This example enables IGMP snooping on the switch:
awplus> enable
awplus# configure terminal
awplus(config)# ip igmp snooping