Troubleshooting guide

3. Troubleshooting Functional Failures During Operation

prefix or address to the target client is set by the ipv6 dhcp relay destination configuration

command.

4. Check whether the

hop-limit value specified for the ipv6 dhcp relay hop-limit

configuration command is equal to or larger than an appropriate hop value for the client.

3.10.3 Troubleshooting IPv6 DHCP server problems

(1) The configuration distribution fails

There are five probable causes of a service operation failure that occurs when you use the prefix

distribution functionality of the IPv6 DHCP server on the Switch.

1. The number of actual clients is larger than the specified number of prefixes available for

distribution.

2. An incorrect client DUID (DHCP Unique Identifier) is specified.

3. The

ipv6 dhcp server setting is not correct.

4. A failure occurs during IPv6 DHCP server operation.

5. Other failures

Use the following procedure to isolate the failures listed above.

Figure 3-15: Failure analysis procedure on the IPv6 DHCP server

(a) Checking the log and interface

Probable causes of disabled communication are a failure (or damage) of the NIM or interface and

a failure of a neighboring device. Check the log displayed by the Switch or use the

show ipv6

interface command to check whether the interface status is Up or Down. For details about the

procedure, see 3.10.1 Communication is not possible or is disconnected.