Multimedia Traffic Control with IP Multicast (IGMP)

More on IGMP Operation

The 33 specifies port B7.

The 2 shows that Fast Forced-Leave is disabled on port B7.

Figure 12-8. Listing the Forced Fast-Leave State for a Single Port

Configuring Per-Port Forced Fast-Leave IGMP. In the factory-default configuration, Forced Fast-Leave is disabled for all ports on the switch. To enable (or disable) this feature on individual ports, use the switch’s MIB commands, as shown below.

Syntax: setmib hpSwitchIgmpPortForcedLeaveState.1.<port-number> -i < 1 2 >

or

setmib 1.3.6.1.4.1.11.2.14.11.5.1.7.1.15.3.1.5.1.<port-number> -i < 1 2 >

where:

1= Forced Fast-Leave enabled

2= Forced Fast-Leave disabled

For example, to enable Forced Fast-Leave on ports B7 and B8:

Command

Verification

Figure 12-9. Example of Changing the Forced Fast-Leave Configuration on Ports 7 and 8

Querier Operation

The function of the IGMP Querier is to poll other IGMP-enabled devices in an IGMP-enabled VLAN to elicit group membership information. The switch performs this function if there is no other device in the VLAN, such as a multicast router, to act as Querier. Although the switch automatically ceases Querier operation in an IGMP-enabled VLAN if it detects another Querier on the VLAN, you can also use a CLI command to disable the Querier function for that VLAN. For example, to disable the Querier function on VLAN 1 in the switch:

1.Disable Querier function on VLAN 1.

HPswitch(config)# no vlan 1 ip igmp querier

2.Disable Querier function on VLAN 1 from within the VLAN 1 context.

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