Troubleshooting Mld; No Member Information On The Receiver-Side Router - H3C LS-3100-52P-OVS-H3 Operation Manual

[SwitchB] display mld interface vlan-interface 100 verbose
Vlan-interface100(2001::2):
MLD proxy is enabled
Current MLD version is 1
Multicast routing on this interface: enabled
Require-router-alert: disabled
Use the display mld group command to view MLD multicast group information. For example,
# View the MLD multicast group information on Switch A.
[SwitchA] display mld group
Total 1 MLD Group(s).
Interface group report information
Vlan-interface100(2001::1):
Total 1 MLD Groups reported
Group Address
ff3e::101
As shown above, the MLD reports sent from the hosts are forwarded to Switch A through the proxy
interface, VLAN-interface 100 of Switch B.

Troubleshooting MLD

No Member Information on the Receiver-Side Router

Symptom
When a host sends a message for joining IPv6 multicast group G, there is no member information of
multicast group G on the immediate router.
Analysis
The correctness of networking and interface connections and whether the protocol layer of the
interface is up directly affect the generation of IPv6 group member information.
IPv6 multicast routing must be enabled on the router and MLD must be enabled on the interface
connecting to the host.
If the MLD version on the router interface is lower than that on the host, the router will not be able to
recognize the MLD report from the host.
If the mld group-policy command has been configured on an interface, the interface cannot
receive report messages that fail to pass filtering.
Solution
1) Check that the networking, interface connections, and IP address configuration are correct. Check
the interface information with the display mld interface command. If there is no information output,
the interface is in an abnormal state. This is usually because you have configured the shutdown
command on the interface, the interface is not properly connected, or the IPv6 address
configuration is not correctly done.
2) Check that the IPv6 multicast routing is enabled. Carry out the display current-configuration
command to check whether the multicast ipv6 routing-enable command has been executed. If
not, carry out the multicast ipv6 routing-enable command in system view to enable IPv6
multicast routing. In addition, enable MLD on the corresponding interface.
Last Reporter Uptime
2001::2 00:02:04
Expires
00:01:15
1-28