Troubleshooting igmp, Symptom, Analysis – H3C Technologies H3C SecPath F1000-E User Manual
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[DeviceB] interface gigabitethernet 1/2
[DeviceB-GigabitEthernet1/2] igmp enable
[DeviceB-GigabitEthernet1/2] quit
Step3
Verify the configuration
Use the display igmp interface command to view the IGMP configuration and operation
information on an interface. For example,
# Display the IGMP configuration and operation information on GigabitEthernet 1/1 of Device B.
[DeviceB] display igmp interface gigabitethernet 1/1 verbose
GigabitEthernet1/1(192.168.1.2):
IGMP proxy is enabled
Current IGMP version is 2
Multicast routing on this interface: enabled
Require-router-alert: disabled
Version1-querier-present-timer-expiry: 00:00:20
Use the display igmp group command to view the IGMP multicast group information. For example,
# Display the IGMP multicast group information on Device A.
[DeviceA] display igmp group
Total 1 IGMP Group(s).
Interface group report information of VPN-Instance: public net
GigabitEthernet1/1(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
As shown above, IGMP reports from the hosts are forwarded to Device A through the proxy interface,
GigabitEthernet 1/1 of Device B.
Troubleshooting IGMP
No Membership Information on the Receiver-Side Router
Symptom
When a host sends a report for joining multicast group G, there is no membership information of the
multicast group G 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.