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3. Troubleshooting Functional Failures in Operation
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3.9 IPv6 Network Communication Failure
3.9.1 Communication Is Disabled or Is Disconnected
There are three possible causes that result in communication failure on the IPv6 network using this system.
1. Configuration on IPv6 communication has changed
2. Network configuration has changed
3. Network component failures
For 1 and 2 above, check for the differences in the configuration and network configuration provided before and after
the change. Check for any difference disabling communication.
This section describes procedure to identify the failed part and to isolate the problem, mainly for the cases of "IPv6
communication is disabled although the configuration and network configuration are correct." and "IPv6
communication had been normally running but it is disabled now." as described in 3 above.
To locate the faulty part and cause, follow the flow below.
Figure 3-13: Failure Analysis Procedure When IPv6 Communication Disabled
<IPv6 communication disabled>
Verify if there is an occurrence of line failure using the show
logging command.
No physical failure
message exists.
A physical failure
message exists.
Check the Up/Down status of the interface
using the show ipv6 interface command.
see the manual "Message Log Reference"and
perform the action described in [Action]
associated with each log message.
Identify the extent of failure using the
ping ipv6 command.
Go to "3.4 Network Interface
Communication Failure."
Communication between the
neighboring host and router
is disabled.
Communication between the
remote host and router is
disabled.
Unicast communication
Solved
Unresolve
The route
information
exists.
Verify the status of
address resolution
using the show ipv6
neighbors command.
Verify the route
information using the
show ipv6 route
command.
Verify RA address
distribution.
Distributed
Not
distributed
No route information exists or the
next hop address is invalid.
Verify the IP network of
remote system. Otherwise, go
to "3.4 Network Interface
Communication Failure."
Analyze the failure on each
routing protocol. (RIPng,
BGP4+, etc.)
Verify the filter
settings.
Verify the RA
settings.