Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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1. The configuration has been set but not distributed.
2. An operation or event has occurred that affects functions related to the automatic routing
information setting.
To isolate the cause of the problem, first, execute the
show ipv6 route -s command to display the
routing information. Next, execute the
show ipv6 dhcp server binding command to display the
information of the distributed prefixes. Then, compare the information obtained from the results
of the both commands.
Table 3-39: Isolating the cause of a failure related to the routing information setting for
prefix distribution targets
The routing information for prefix distribution targets is not always retained, as shown in the
following table.
Table 3-40: Conditions that affect whether the routing information for prefix distribution
targets is retained
Legend
Y: Retained
Y/N: Not retained (The information of each state might be retained.)
N: Not retained (The information is initialized and needs to be set again.)
Notes:
The route management functionality needed to perform the routing information setting
operation for prefix distribution targets
For details about other failures, see 3.10.1 Communication is not possible or is disconnected.
(a) Checking the routing information
Consider the case where the automatic route setting functionality is used for distributing prefixes
from the IPv6 DHCP server on the Switch to assignment targets. In this case, use the
show ipv6
route command with the -s parameter to check the routing information after prefix distribution.
Figure 3-16: Checking the routing information by using the operation command
> show ipv6 route -s
Total: 10routes
Conditions Causes
Does the binding information
exist?
Does the routing
information exist?
Yes Yes Not applicable. The status is active.
Yes N o Ca u s e 2
No Yes Cause 2
No No Causes 1 and 2
Prefix-related
information to be
retained
Events that affect whether the information is retained
The server functionality is
restarted
The routing manager is
restarted
The Switch is
estarted
By executing
a command
Due to a server
failure
Routing information for
clients
YY/NY N