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IGMP Snooping Querier Commands
CLI Command Reference
September 2014 Page 430
HP Moonshot Switch Module CLI Command Reference
IGMP Snooping Querier Commands
IGMP Snooping requires that one central switch or router periodically query all end-devices on the network to
announce their multicast memberships. This central device is the “IGMP Querier”. The IGMP query responses,
known as IGMP reports, keep the switch updated with the current multicast group membership on a port-by-
port basis. If the switch does not receive updated membership information in a timely fashion, it will stop
forwarding multicasts to the port where the end device is located.
This section describes commands used to configure and display information on IGMP Snooping Queriers on the
network and, separately, on VLANs.
set igmp querier
Use this command to enable IGMP Snooping Querier on the system, using Global Config mode, or on a VLAN.
Using this command, you can specify the IP address that the Snooping Querier switch should use as the source
address while generating periodic queries.
If a VLAN has IGMP Snooping Querier enabled and IGMP Snooping is operationally disabled on it, IGMP
Snooping Querier functionality is disabled on that VLAN. IGMP Snooping functionality is re-enabled if IGMP
Snooping is operational on the VLAN.
The IGMP Snooping Querier application supports sending periodic general queries on the VLAN to solicit
membership reports.
Note: This note clarifies the prioritization of MGMD Snooping Configurations. Many of the IGMP/
MLD Snooping commands are available both in the Interface and VLAN modes. Operationally the
system chooses or prefers the VLAN configured values over the Interface configured values for most
configurations when the interface participates in the VLAN.
Note: The Querier IP address assigned for a VLAN takes preference over global configuration.
Default disabled
Format
set igmp querier vlan-id [address ipv4_address]
Mode VLAN Database
Default disabled
Format
set igmp querier [address ipv4_address]
Mode Global Config