Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
58
#: 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.
4Use the show mld-snooping
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:
MLD querying system:
• If the Switch is the MLD querier, make sure the IP address has been set
for the VLAN.
(1) If the IP address has been set for the VLAN, the following message
is displayed:
IP Address: fe80::200:87ff:fe10:1959*
(2) If the IP address has not been set for the VLAN, nothing is displayed
for
IP Address:
IP Address:
• If a multicast router is connected, check the
Mrouter-port setting.
>show mld-snooping 100
Date 2005/05/15 15:20:00
VLAN 100:
IP Address:fe80::200:87ff:fe10:1959 Querier :
enable
MLD querying system: fe80::200:87ff:fe10:1959
Port(2): 0/1,0/3
Mrouter-port: 0/1
Group Count :3
5Use the show mld-snooping
command with the
group
parameter 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 100
Date 2005/05/15 15:20:00
VLAN 100 Group count:2
Group Address MAC Address
ff0e::0e0a:0a01 3333.0e0a.0a01
Port-list 0/1-3
ff0e::0102:0c11 3333.0102.0c11
Port-list 0/1-2
No. Items to check and commands Action