Enabling The Pseudo-Querier; Changing Igmp Timers - 3Com 3CRWX120695A, 3CRWX440095A Configuration Manual

224 C 10: C
HAPTER ONFIGURING AND
Enabling the
Pseudo-Querier
Changing IGMP
Timers
M IGMP S
ANAGING
To disable or reenable proxy reporting, use the following command:
set igmp proxy-report {enable | disable} [vlan vlan-id]
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.
3Com 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]
You can change the following IGMP timers:
Query interval — Number of seconds that elapse between general
queries sent by the WX switch to advertise multicast groups.
Other-querier-present interval — Number of seconds that the WX
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
WX switch waits for a receiver to respond to a group-specific query
message before removing the receiver from the receiver list for the
group.
The query interval, other-querier-present interval, and query response
interval are applicable only when the WX 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 224.
Last member query interval — Number of tenths of a second that
the WX 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.
NOOPING