Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
67
No. Items to check and commands Action
7 Check whether the sending of flush
control frames is set on the Switch.
 When not set:
Wait until aging of the MAC address table on the upstream
switch has finished.
 When set:
Check the configuration of the port and the sending VLAN for
which sending of flush control frames has been set. If the
configuration is not correct, set the configuration again.
8 Check whether the sending of MAC
address update frames is set on the
Switch.
 When not set:
Wait until aging of the MAC address table on the upstream
switch has finished.
 When set:
- Check whether the VLAN that has learned the MAC
addresses on the port connected to the terminal is included
in the uplink port pair. If it is not included, specify the setting
again.
- Check whether the same VLAN is set for both ports of the
uplink port pair (primary and secondary). If different VLANs
are set, set the same VLAN.
For other cases, go to No. 9.
9 Use the operation command show
switchport backup
mac-address-table update
statistics to make sure the
value displayed for Transmission
over flows has been
incremented.
If the value has been incremented, the number of applicable MAC
addresses for MAC address update frames exceeds 1,024.
 If the MAC addresses not applicable for MAC address
update frames can be deleted at the VLAN level:
Set the VLAN to be processed.
 If the VLAN cannot be processed:
Wait until aging of the MAC address table on the upstream
switch has finished.