R3303-HP 6600/HSR6600 Routers IP Multicast Configuration Guide

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Current IGMP version is 2
Multicast routing on this interface: enabled
Require-router-alert: disabled
Version1-querier-present-timer-expiry: 00:00:20
# Display the IGMP group information on Router A.
[RouterA] display igmp group
Total 1 IGMP Group(s).
Interface group report information of VPN-Instance: public net
GigabitEthernet2/1/1(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
The output shows that IGMP reports from the hosts are forwarded to Router A through the proxy
interface, GigabitEthernet 2/1/1 of Router B.
Troubleshooting IGMP
This section describes common IGMP problems and how to troubleshoot them.
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 interface command to verify that the networking, interface connection, and IP
address configuration are correct. If the interface is physically down or the protocol state of the
interface is down, 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 correctly connected,
or that the IP address configuration is not correctly completed.
2. Use the display current-configuration command to verify that multicast routing is enabled. If not,
use 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.