Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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No. Items to check and commands Action
If Can't execute is displayed, remove the memory card and
check the memory card and memory card slot for dust.
If there is dust, wipe it off with a dry cloth, and then insert the
memory card into the slot again.
After inserting the memory card, execute the format mc
operation command again.
If the same message appears again, the memory card might have
been corrupted. Replace it with another memory card.
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For details about save events and the wait-to-write time, see the Configuration Guide
Vol. 1.
(3) When the binding database cannot be restored
If the binding database cannot be restored when the DHCP snooping functionality is used,
take action according to the tables below.
(a) Database cannot be restored from internal flash memory
Table 3-21 When the save location for the binding database is internal flash memory
No. Items to check and commands Action
1 Use the show ip dhcp snooping
binding operation command to
check the time that the database
was saved.
If a hyphen (-) is displayed for Agent URL, continue with No. 2.
If the time displayed for Last succeeded time is too old, continue
with No. 3.
2 Use the show running-config
operation command to check the
configuration.
If ip dhcp snooping database url flash is set, continue with
No. 3.
If ip dhcp snooping database url flash is not set, set the
ip dhcp snooping database url flash configuration
command.
3 Use the show logging operation
command to check the operation log
for restoration of the binding
database.
If It was not able to restore binding database from
flash. has been recorded, restoration has failed.
The binding database saved in internal flash memory might be
corrupted.
Clear the IP addresses on the DHCP client terminal. (In Windows,
in the Command Prompt window, execute ipconfig /release,
and then ipconfig /renew.)
(b) The database cannot be restored from a memory card
Table 3-22 When the save location for the binding database is a memory card
No. Items to check and commands Action
1 Use the show ip dhcp snooping
If a hyphen (-) is displayed for Agent URL, continue with No. 2.