Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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Figure 3-7: Failure analysis procedure on DHCP and BOOTP relays
(a) Checking the log and interface
One probable cause of disabled assignment of IP addresses to clients is that communication
between the client and the server has been disabled. Check the log displayed by the Switch or use
the
show ip interface command to check whether the interface status is Up or Down. For details
about the procedure, see 3.7.1 Communication is not possible or is disconnected.
(b) Identifying the range for a failure (from the Switch)
If a failure has not occurred on the Switch, a failure might have occurred somewhere on the route
between the Switch and the remote device. To identify the range for a failure in order to determine
the fault location on the route, do the following: