C613-50100-01 REV C Command Reference for x930 Series 1621
AlliedWare Plus™ Operating System - Version 5.4.6-1.x
IGMP AND IGMP SNOOPING COMMANDS
IP
IGMP SOURCE-ADDRESS-CHECK
ip igmp source-address-check
Overview This command enables the checking of the Source Address for an IGMP Report,
rejecting any IGMP Reports originating on devices outside of the local subnet.
Use the no variant of this command to disable the checking of the Source Address
for an IGMP Report, which allows IGMP Reports from devices outside of the local
subnet.
Syntax
ip igmp source-address-check
no ip igmp source-address-check
Default Source address checking for IGMP Reports is enabled by default.
Mode Interface Configuration for a VLAN interface.
Usage This is a security feature, and should be enabled unless IGMP Reports from outside
the local subnet are expected, for example, if Multicast VLAN Registration is active
in the network.
The no variant of this command is required to disable the IGMP Report source
address checking feature in networks that use Multicast VLAN Registration to allow
IGMP Reports from devices outside of the local subnet.
Examples To deny IGMP Reports from outside the current subnet for vlan20, use the
following commands:
awplus# configure terminal
awplus(config)# interface vlan20
awplus(config-if)# ip igmp source-address-check
To allow IGMP Reports from outside the current subnet for vlan10, use the
following commands:
awplus# configure terminal
awplus(config)# interface vlan10
awplus(config-if)# no ip igmp source-address-check
Validation
Commands
show ip igmp interface
show running-config
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