User Guide

OmniAccess SafeGuard OS Administration Guide
170
Chapter 5: Setting Up SafeGuard Switches
(SafeGuardOS) (config) #vlan database
(SafeGuardOS) (Vlan) #igmpsnooping vlan 2 mrouter-expire-time 2400
(SafeGuardOS) (Vlan) #exit
(SafeGuardOS) (config) #exit
(SafeGuardOS) #
To verify the configuration, use the Privileged Exec show igmpsnooping command. This
command is described further in Showing the IGMP Snooping Configuration on page 172.
Enabling Fast-Leave Mode
Fast-leave is an optional feature of IGMP Snooping for VLANs and is only supported on
IGMPv2 hosts. Use fast-leave processing only on VLANs where only one host is
connected to each interface. Fast-leave mode is disabled by default. If fast-leave is
enabled on VLANs where more than one host is connected to an interface, some hosts can
be dropped when connected to the same Layer 2 port receiving multicast traffic directed
to the group.
This feature allows the switch to remove the Layer 2 LAN interface from the forwarding-
table entry without first sending out MAC-based queries to the interface. To enable fast-
leave mode, use the igmpsnooping vlan fast-leave command in Vlan Configuration
mode. Use the no version of the command to disable the feature.
igmpsnooping vlan vlanid fast-leave
no igmpsnooping vlan vlanid fast-leave
The following example enables fast-leave mode on the VLAN:
(SafeGuardOS) #configure terminal
(SafeGuardOS) (interface interface 0/3) #igmpsnooping vlan 2 fast-leave
(SafeGuardOS) (interface interface 0/3) #exit
(SafeGuardOS) (config) #exit
(SafeGuardOS) #
To verify the configuration, use the Privileged Exec show igmpsnooping command. This
command is described further in Showing the IGMP Snooping Configuration on page 172.
Enabling Fast-Leave Mode On An Interface
to enable fast-leave mode on an interface, use the igmpsnooping fast-leave command
in Interface Configuration mode. To disable fast-leave mode on an interface, use the no
form of the command.
Syntax Description vlanid Enables fast-leave mode on a VLAN having
this identification number. Valid assignment
numbers are from 1 to 4094.