3Com Switch 8800 Advanced Software V5 Configuration Guide

648 CHAPTER 44: MLD CONFIGURATION
Analysis
■ The correctness of networking and interface connections directly affects the
generation of IPv6 group member information.
■ IPv6 multicast routing must be enabled on the device.
Solution
1 Check that the networking is correct and that interface connections are correct.
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.
3 Check that the interface is normal and that a correct IPv6 address has been
configured. Carry out the display mld interface command to display the
interface information. If no interface information is output, the interface is
abnormal. Typically this is because the shutdown command has been executed
on the interface, or the interface connection is incorrect, or no correct IPv6 address
has been configured on the interface.
Inconsistent
Memberships on
Routers on the Same
Subnet
Symptom
Different memberships are maintained on different MLD routers or route switches
on the same subnet.
Analysis
■ A router or routing switch running MLD maintains multiple parameters for
each interface, and these parameters influence one another, forming very
complicated relationships. Inconsistent MLD interface parameter configurations
for routers or routing switches on the same subnet will surely result in
inconsistent MLD memberships.
■ If the Switch 8800s are working with other devices (third-party routers or
networking devices, for example) on the same network, there can be an issue
of inconsistent MLD versions. Two MLD versions are currently available. The
Switch 8800s only support MLDv1. Although routers or routing switches
running different MLD versions are compatible with hosts, all devices on the
same subnet must run the same MLD version. Inconsistent MLD versions
running on routers routing switches on the same subnet will also lead to chaos
of MLD memberships.
Solution
1 Check MLD configurations. Carry out the display current-configuration
command to display the MLD configuration information on the interface.
2 Carry out the display mld interface command on all routers or routing switches
on the same subnet to check the MLD timers for consistent configurations.
3 Use the display mld interface command to check that the routers or routing
switches are running the same MLD version.