Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 756)

IGMP Snooping Commands
Software Reference for x310 Series Switches
31.18 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
ip igmp ra-option (Router Alert)
Use this command to enable strict Router Alert (RA) option validation. With strict RA
option enabled, IGMP packets without RA options are ignored.
Syntax ip igmp ra-option
no ip igmp ra-option
Default The default state of RA validation is unset.
Mode Interface Configuration for a VLAN interface.
Usage This command applies to interfaces configured for IGMP and IGMP Snooping.
Ensure your VLAN is configured first: see Chapter 16, Configuring VLANs .
Example
awplus# configure terminal
awplus(config)# interface vlan20
awplus(config-if)# ip igmp ra-option