l Run the display igmp group ssm-mapping [ verbose ] command to check the information
about the multicast group that is already configured with SSM mapping.
l Run the display igmp interface [ interface-type interface-number ] [ verbose ] command
to check the configuration and running status of IGMP on the interface.
l Run the display igmp routing-table [ group-address [ mask { group-mask | group-mask-
length } ] | source-address [ mask { source-mask | source-mask-length } ] ]
*
[ static ]
command to check the information about the IGMP routing table.
l Run the display igmp ssm-mapping { group [ group-address ] | interface [ interface-
type interface-number ] } command to check the information about SSM mapping of a
specific source or group.
----End
4.7.3 Debugging IGMP
Context
CAUTION
Debugging affects the performance of the system. So, after debugging, run the undo debugging
all command to disable it immediately.
Procedure
l Run the debugging igmp { all | event | leave [ basic-acl-number ] | report [ advanced-
acl-number ] | query [ basic-acl-number ] | timer } command to enable the debugging of
IGMP.
l Run the debugging igmp ssm-mapping [ advanced-acl-number ] command to enable the
debugging of SSM mapping.
----End
4.8 Configuration Examples
This section provides several configuration examples of IGMP.
4.8.1 Example for Configuring Basic IGMP Functions
Networking Requirements
On the network as shown in Figure 4-1, the unicast routing function is normal. You are required
to implement multicast on the network to enable hosts to receive the Video On Demand (VOD)
information.
When the hosts connected to a certain interface need to receive a popular program for a long
time, you can add the interface to a multicast group statically. As shown in the following figure,
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 4 IGMP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
89
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