Within the suppression duration, the S7700 sends only one copy of the same IGMP
messages continuously sent by hosts to the upstream router. This reduces the number of
redundant messages.
l Aging time of a router interface
When a short-run congestion occurs on the network, the transmission of Query messages
from the IGMP querier to the S7700 takes a longer time. If the router interface ages in this
period, the S7700 does not send Report or Leave messages to the router interface. In this
case, forwarding of multicast data may be interrupted. As a result, you should set a longer
aging time for router interfaces on an unstable network.
l Maximum response time for IGMP Query messages
When hosts are required to respond to IGMP Query messages quickly, you can set a shorter
maximum response time. To avoid congestion caused by a large number of Response
messages sent by hosts, you can set a longer maximum response time.
l Router Alert option
The S7700 determines whether to process IGMP messages by checking the Router Alert
option in the messages. You can determine whether IGMP messages contains the Router
Alert option.
l Source IP address of IGMP Query messages sent by the S7700
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
vlan vlan-id
The VLAN view is displayed.
Step 3 Run:
igmp-snooping suppress-time suppress-time
The suppression duration of IGMP messages is set.
By default, the suppression duration of IGMP messages is 10 seconds.
NOTE
For IGMP Report and Leave messages, it is recommended that you set the suppression duration the same
as the maximum response time for these messages in a VLAN.
Step 4 Run:
igmp-snooping router-aging-time router-aging-time
The aging time of the router interface is set.
By default, the S7700 sets the aging time of the router interface as follows:
l If the router interface receives an IGMP Query message, the S7700 sets the aging time of
the interface to 180 seconds.
l If the router interface receives a PIM Hello message and the holdtime value of the Hello
message is larger than the remaining aging time of the interface, the S7700 sets the aging
time of the interface to the holdtime value contained in the PIM Hello message. If the holdtime
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 2 IGMP Snooping Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
21
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