Administrator Guide

Layer 3 Routing Commands 1451
Default Configuration
Disabled is the default state.
Command Mode
Interface VLAN Configuration mode
User Guidelines
IGMP is enabled when ip pim sparse-mode, ip pim dense-mode, ip dvmrp,
or ip igmp-proxy are enabled.
A multicast routing protocol (e.g. PIM) should be enabled whenever IGMP is
enabled.
L3 IP multicast must be enabled for IGMP to operate.
Example
The following example globally enables IGMP the IGMP proxy service on
VLAN 1.
console(config)#ip multicast-routing
console(config)#interface vlan 1
console(config-if-vlan1)#ip igmp mroute-proxy
ip igmp query-interval
Use the ip igmp query-interval command in Interface Configuration mode to
configure the query interval for the specified interface. The query interval
determines how fast IGMP Host-Query packets are transmitted on this
interface.
Syntax
ip igmp query-interval seconds
no ip igmp query-interval
• seconds — Query interval. (Range: 1-3600)
Default Configuration
The default query interval value is 125 seconds.