Multimedia Traffic Control with IP Multicast (IGMP)

IGMP Operating Features

IGMP Configuration for the Selected

VLAN

IGMP Configuration

On the Individual

Ports in the VLAN

Figure 12-2. Example Listing of IGMP Configuration for A Specific VLAN

Enabling or Disabling IGMP on a VLAN. You can enable IGMP on a VLAN, along with the last-saved or default IGMP configuration (whichever was most recently set), or you can disable IGMP on a selected VLAN. Note that this command must be executed in a VLAN context.

Syntax: [no] ip igmp

For example, here are methods to enable and disable IGMP on the default

VLAN (VID = 1).

 

HPswitch(config)# vlan 1 ip

igmp

Enables IGMP on VLAN 1.

 

HPswitch(vlan-1)#

ip

igmp

 

Same as above.

 

HPswitch(config)#

no

vlan 1

ip igmp Disables IGMP on VLAN 1.

 

 

N o t e

If you disable IGMP on a VLAN and then later re-enable IGMP on that VLAN,

 

the switch restores the last-saved IGMP configuration for that VLAN. For more

on how switch memory operates, see Chapter 5, “Switch Memory and Config­ uration”.

You can also combine the ip igmp command with other IGMP-related com­ mands, as described in the following sections.

12-7