Reference Guide

Table Of Contents
The time-to-live (TTL) field in the IGMP header and drops packets where TTL is not equal to 1. The
TTL field should always be set to 1 in the headers of IGMP reports and queries.
The presence of the router alert option (9404) in the IP packet header of the IGMPv2 message and
drops packets that do not include this option.
The presence of the router alert option (9404) and ToS Byte = 0xC0 (Internet Control) in the IP
packet header of IGMPv3 message and drops packets that do not include these options.
Default Enabled
Format set igmp header-validation
Mode Global Config
no set igmp header-validation
This command disables header validation for IGMP messages.
Format no set igmp header-validation
Mode Global Config
set igmp interfacemode
This command enables IGMP Snooping on all interfaces. 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.
Default
Disabled
Format set igmp interfacemode
Mode Global Config
no set igmp interfacemode
This command disables IGMP Snooping on all interfaces.
Format
no set igmp interfacemode
Mode Global Config
set igmp fast-leave
This command enables or disables IGMP Snooping fast-leave admin mode on a selected interface, a
range of interfaces, or a VLAN. Enabling fast-leave allows the switch to immediately remove the layer 2
LAN interface from its forwarding table entry upon receiving an IGMP leave message for that multicast
group without first sending out MAC-based general queries to the interface.
You should enable fast-leave admin mode only on VLANs where only one host is connected to each
layer 2 LAN port. This prevents the inadvertent dropping of the other hosts that were connected to the
Switching Commands
ExtremeSwitching 200 Series: Command Reference Guide for version 01 .02.04.0007 433