Troubleshooting Igmp - HP A8800 Configuration Manual

Verify the configuration
# Display IGMP information on GigabitEthernet 3/1/1 of Router B.
[RouterB] display igmp interface GigabitEthernet 3/1/1 verbose
GigabitEthernet3/1/1(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
# Display IGMP group information on Router A.
[RouterA] display igmp group
Total 1 IGMP Group(s).
Interface group report information of VPN-Instance: public net
GigabitEthernet3/1/1(192.168.1.1):
Total 1 IGMP Groups reported
Group Address
224.1.1.1
The output shows that IGMP reports from the hosts are forwarded to Router A through the proxy interface,
GigabitEthernet 3/1/1 of Router B.

Troubleshooting IGMP

No membership information exists 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 that
connects 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 you have configured the igmp group-policy command 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 might be that you have configured the shutdown command on the interface, that
the interface is not properly connected, or that the IP address configuration is not correctly
completed.
Last Reporter Uptime
192.168.1.2 00:02:04
108
Expires
00:01:15