Troubleshooting Mld; No Member Information On The Receiver-Side Router - HP 6125G Configuration Manual

# Display MLD 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
The output shows that 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 to announce its joining IPv6 multicast group G, no member information
of multicast group G exists 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
Check that the networking, interface connections, and IP address configuration are correct. Check
1.
the interface information with the display mld interface command. If no information is 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.
Use the display current-configuration command to verify that the IPv6 multicast routing is enabled.
2.
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.
You can use the display mld interface command to verify that the MLD version on the interface is
3.
lower than that on the host.
Use the display current-configuration interface command to verify that no ACL rule has been
4.
configured to restrict the host from joining IPv6 multicast group G. If an IPv6 ACL is configured to
restrict the host from joining IPv6 multicast group G, the ACL must be modified to allow IPv6
multicast group G to receive report messages.
Last Reporter Uptime
2001::2 00:02:04
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