129
Multicast routing on this interface: enabled
Require-router-alert: disabled
Version1-querier-present-timer-expiry: 00:00:20
# Display IGMP group information on Switch A.
[SwitchA] display igmp group
Total 1 IGMP Group(s).
Interface group report information of VPN-Instance: public net
Vlan-interface100(192.168.1.1):
Total 1 IGMP Groups reported
Group Address Last Reporter Uptime Expires
224.1.1.1 192.168.1.2 00:02:04 00:01:15
The output shows that IGMP reports from the hosts are forwarded to Switch A through the proxy interface,
VLAN-interface 100 on Switch B.
Troubleshooting IGMP
No membership information on the receiver-side router
Symptom
When a host sends a report for joining multicast group G, no membership information of the multicast
group G exists on the router closest to that host.
Analysis
• The correctness of networking and interface connections and whether the protocol layer of the
interface is up directly affect the generation of group membership information.
• Multicast routing must be enabled on the router, and IGMP must be enabled on the interface
connecting to the host.
• If the IGMP version on the router interface is lower than that on the host, the router will not be able
to recognize the IGMP report from the host.
• 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. Use the display igmp interface command to verify that the networking, interface connection, and
IP address configuration are correct. If no information is output, the interface is in an abnormal
state. The reason is that you have configured the shutdown command on the interface, the
interface is not properly connected, or the IP address configuration is not correct.
2. Check that . Use the display current-configuration command to verify that multicast routing is
enabled. 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.
3. Use the display igmp interface command to verify that the IGMP version on the interface is lower
than that on the host.
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