Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
46
No. Items to check and
commands
Action
3 If multicast forwarding is not
performed, use the show
mld-snooping operation
command to check the MLD
snooping configuration.
Check the following:
- To check whether the MLD querier that monitors the group members
exists, make sure one of the following messages is displayed.
(1) If the MLD querier exists, the IP address of the MLD querier is
displayed:
MLD querying system: fe80::200:87ff:fe10:1959
#
(2) If the MLD querier does not exist, nothing is displayed for MLD
querying system:.
- If the Switch is the MLD querier, make sure the sender IP address has
been set by using the ipv6 mld snooping source configuration
command.
MLD querying system:
(3) If the sender IP address has not been set by the ipv6 mld
snooping source configuration command, nothing is displayed for
IP Address:.
IP Address:
- If a multicast router is connected, check the Mrouter-port setting.
>show mld-snooping 3001
Date 14.11.08 05:21:51 PM UTC
VLAN counts: 3
VLAN 3001:
IP Address: Querier: enable
MLD querying system:
Querier version: v1
Port (1): 0/12
Mrouter-port: 0/12
Group counts: 1
4 If multicast forwarding is not
performed, use the show
mld-snooping group
operation command to check
the IPv6 multicast group
address.
Check the following:
- Make sure the joined IPv6 multicast group address is displayed by the
show mld-snooping group command.
> show mld-snooping group 3001
Date 14.11.08 05:22:10 PM UTC
Total Groups: 3
VLAN counts: 3
VLAN 3001 Group counts: 1
Group Address MAC Address Version Mode
ff80:0:0:0:0:0:99:a0a 3333.0099.0a0a v1 -
Port-list: 0/12
#: If the Switch is the MLD querier, the same address is displayed for MLD querying system
and
IP Address. If any other switch is the MLD querier, the address displayed for MLD
querying system is not the same as the address displayed for IP Address.