626 CHAPTER 46: IGMP CONFIGURATION
# Enable IP multicast routing on Switch C, and enable IGMP (version 2) on
VLAN-interface 200.
<SwitchC> system-view
[SwitchC] multicast routing-enable
[SwitchC] interface vlan-interface 200
[SwitchC-Vlan-interface200] igmp enable
[SwitchC-Vlan-interface200] igmp version 2
[SwitchC-Vlan-interface200] quit
3 Verify the configuration
Carry out the display igmp interface command to view the IGMP configuration
and running status on each switch interface. For example:
# View IGMP information on VLAN-interface 200 of Switch B.
[SwitchB] display igmp interface vlan-interface 200
Vlan-interface200(10.110.2.1):
IGMP is enabled
Current IGMP version is 2
Value of query interval for IGMP(in seconds): 60
Value of other querier timeout for IGMP(in seconds): 125
Value of maximum query response time for IGMP(in seconds): 10
Querier for IGMP: 10.110.2.1 (this router)
Total 1 IGMP Group reported
Troubleshooting IGMP
No Member Information
on the Receiver-Side
Router
Symptom
When a host sends a report for joining multicast group G, there is no member
information of the multicast group G on the router closest to that host.
Analysis
■ The correctness of networking and interface connections directly affects the
generation of group member information.
■ Multicast routing must be enabled on the router.
■ If the igmp group-policy command has been configured on the interface, the
interface cannot receive report messages that fail to pass filtering.
Solution
1 Check that the networking is correct and interface connections are correct.
2 Check that the interfaces and the host are on the same subnet. Use the display
current-configuration interface command to view the IP address of the
interface.
3 Check that multicast routing is enabled. Carry out the display
current-configuration command to check whether the multicast
routing-enable command has been executed. If not, carry out the multicast
routing-enable command in system view to enable IP multicast routing. In
addition, check that IGMP is enabled on the corresponding interfaces.
4 Check that the interface is in normal state and the correct IP address has been
configured. Carry out the display igmp interface command to view the interface
information. If no interface information is output, this means the interface is
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