Command Reference Guide

IGMP Snooping Configuration Commands
CLI Command Reference
September 2014 Page 421
HP Moonshot Switch Module CLI Command Reference
IGMP Snooping Configuration Commands
This section describes the commands you use to configure IGMP snooping. HP Moonshot Switch Module
software supports IGMP Versions 1, 2, and 3. The IGMP snooping feature can help conserve bandwidth
because it allows the switch to forward IP multicast traffic only to connected hosts that request multicast
traffic. IGMPv3 adds source filtering capabilities to IGMP versions 1 and 2.
set igmp
This command enables IGMP Snooping on the system (Global Config Mode), an interface, or a range of
interfaces. This command also enables IGMP snooping on a particular VLAN (VLAN Config Mode) and can
enable IGMP snooping on all interfaces participating in a VLAN.
If an interface has IGMP Snooping enabled and you enable this interface for routing or enlist it as a member of
a port-channel (LAG), IGMP Snooping functionality is disabled on that interface. IGMP Snooping functionality
is re-enabled if you disable routing or remove port-channel (LAG) membership from an interface that has IGMP
Snooping enabled.
The IGMP application supports the following activities:
• Validation of the IP header checksum (as well as the IGMP header checksum) and discarding of the frame
upon checksum error.
• Maintenance of the forwarding table entries based on the MAC address versus the IP address.
• Flooding of unregistered multicast data packets to all ports in the VLAN.
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.
Default disabled
Format
set igmp vlan_id
Mode VLAN Config
Default disabled
Format
set igmp
Mode • Global Config
•Interface Config