Changing Igmp Timers - D-Link DWS-1008 User Manual

DWS-1008 User's Manual DWS-1008 User's Manual
Note: D-Link 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
switch to advertise multicast groups.
• Other-querier-present interval - Number of seconds that the 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 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 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.
• Last member query interval - Number of tenths of a second that the 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.
Changing the Query Interval
To change the IGMP query interval timer, use the following command:
set igmp qi seconds [vlan vlan-id]
For seconds, you can specify a value from 1 through 65,535. The default is 125 seconds.
Changing the Other-Querier-Present Interval
To change the other-querier-present interval, use the following command:
set igmp oqi seconds [vlan vlan-id]
For seconds, you can specify a value from 1 through 65,535. The default is 255 seconds.
D-Link Systems, Inc.
Configuring and Managing IGMP Snooping
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