Nortel Networks 2300 manual Enabling the Pseudo-Querier, Changing Igmp Timers

336Configuring and Managing IGMP Snooping

To disable or reenable proxy reporting, use the following command:

set igmp proxy-report {enable disable} [vlan vlan-id]

Enabling the Pseudo-Querier

The IGMP pseudo-querier enables IGMP snooping to operate in a VLAN that does not have a multicast router to send IGMP general queries to clients.

Note. Nortel recommends that you use the pseudo-querier only when the VLAN contains local multicast traffic sources and no multicast router is servicing the subnet.

To enable the pseudo-querier, use the following command:

set igmp querier {enable disable} [vlan vlan-id]

Changing IGMP Timers

You can change the following IGMP timers:

•Query interval—Number of seconds that elapse between general queries sent by the WSS switch to advertise multicast groups.

•Other-querier-present interval—Number of seconds that the WSS switch waits for a general query to arrive from another querier before electing itself the querier.

•Query response interval—Number of tenths of a second that the WSS switch waits for a receiver to respond to a group-specific query message before removing the receiver from the receiver list for the group.

Note. The query interval, other-querier-present interval, and query response interval are applicable only when the WSS switch is querier for the subnet. For the switch to become the querier, the pseudo-querier feature must be enabled on the switch and the switch must have the lowest IP address among all the devices eligible to become a querier. To enable the pseudo-querier feature, see “Enabling the Pseudo-Querier” on page 336.

•Last member query interval—Number of tenths of a second that the WSS switch waits for a response to a group-specific query after receiving a leave message for that group, before removing the receiver that sent the leave message from the list of receivers for the group. If there are no more receivers for the group, the switch also sends a leave message for the group to multicast routers.

•Robustness value—Number used as a multiplier to adjust the IGMP timers to the amount of traffic loss that occurs on the network. Set the robustness value higher to adjust for more traffic loss.

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