Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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configuration. For details about the procedure, see 3.25.1 Checking the filters and QoS
configuration information.
In addition, if DHCP snooping is used, packets might have been discarded by a terminal filter.
Check whether the setting conditions for DHCP snooping in the configuration are correct. For
details about the procedure, see 3.27 DHCP snooping problems.
(9) Checking the optional license OP-NPAR
If the target interface is a VRF interface and the configuration is present, but the interface is not
displayed by the
show ip interface command, the optional license OP-NPAR might have not
been registered or might be invalid. Use the
show license command to check optional licenses of
the Switch. To carry out the check, do the following:
1. Log in to the Switch.
2. Use the
show license command to check the license software and enabled options.
3. If OP-NPAR is not displayed for the license software, the OP-NPAR license key is not
registered. Register the OP-NPAR license key.
4. If OP-NPAR is displayed for the license software, but OP-NPAR is not displayed for the
enabled options, the hardware configuration of the Switch might not support OP-NPAR.
Check the hardware configuration. For details about the hardware configurations that do not
support OP-NPAR, see the Configuration Guide Vol. 1.
5. If the hardware configuration of the Switch supports OP-NPAR, but OP-NPAR is not
displayed for the enabled options, it is necessary to restart the Switch to enable the optional
license. Use the
reload command to restart the Switch.
6. If OP-NPAR is displayed for the enabled options, perform steps 4 onwards in (2) Checking
the interface status.
3.7.2 IP addresses cannot be assigned by the DHCP functionality
(1) Communication problems on DHCP and BOOTP relays
There are three probable causes for communication problems on DHCP and BOOTP relays:
1. A configuration related to the DHCP or BOOTP relay communication is changed.
2. The network configuration is changed.
3. The DHCP or BOOTP server fails.
For cause 2, check the differences in the network configuration before and after the change to
uncover any cause that could disable communication.
In this section, ALAXALA Networks Corporation considers a case to which the cause 1 or 3
applies, assuming that you have checked the client settings (such as network card settings and cable
connections). This is a case when, for example, after the configuration is changed, the DHCP or
BOOTP server cannot assign IP addresses, or when the configuration and network configuration
are correct, but IP addresses cannot be assigned to clients and IP communication fails. The
following describes the procedure for isolating the fault location to identify the cause of the
problem.
Use the following flowchart to isolate the fault location to identify the cause of the problem.