NEC ip8800-s6700 User Manual

3.   

Troubleshooting Functional Failures in Operation

51

Figure 3-7: Failure Analysis Procedure When IPv4 Communication Disabled

(1) Checking log

Communication may be interrupted by a line failure (or damage). The following procedure displays hardware error 
messages among this system's log messages.

For details about the log, see the manual "Message Log Reference."

1. Log in to the system.
2. Display the log using the show logging command.
3. The date and time when an error occurred are displayed in the log. Check to see if a log was displayed at the date/ 

time when communication was disabled.

4. For detailed information about the failure in the log displayed at the time and date of the communication interruption 

and the actions for failures, see the manual "Message Log Reference." Follow the instruction.

5. If there is no log recorded at the time and date when communication was disabled, go to "

Verify if there is a line failure log message.

A line failure log message exists.

No line failure log message exists.

Check the Up/Down status of the interface.

See the manual"Message Log Reference"and 

perform the action described in [Action] 

associated with each log message.

Identify the extent of the failure using the ping 

command.

Go to "

."

Communication between the neighboring host and router is disabled.

Communication 

between remote 

host and router is 

disabled.

Verify the status of address resolution using the show ip arp command.

Solved

Verify the route information using the 

show ip route command.

Unresolved

No route information 

exists or the next hop 

address is invalid.

Go to "

The route 

information exists.

Verify the IP network of remote system. 
Otherwise, go to "

<IPv4 communication is disabled.>

Confirm Option License OP-NPAR.

VRF interface is not displayed

down

up

" and "

."