Ipv6 Network Communication Failure; Communication Is Disabled Or Is Disconnected - NEC IP8800/S2400 Series Troubleshooting Manual

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
No physical failure
message exists.
Check the Up/Down status of the interface
using the show ipv6 interface command.
Identify the extent of failure using the
Communication between the
neighboring host and router
Verify the status of
address resolution
using the show ipv6
neighbors command.
Unresolve
Verify the IP network of
remote system. Otherwise, go
to "3.4 Network Interface
Communication Failure."
<IPv6 communication disabled>
Verify if there is an occurrence of line failure using the show
logging command.
ping ipv6 command.
Communication between the
remote host and router is
is disabled.
Verify the route
Solved
information using the
show ipv6 route
command.
No route information exists or the
next hop address is invalid.
Analyze the failure on each
routing protocol. (RIPng,
BGP4+, etc.)
3.
Troubleshooting Functional Failures in Operation
A physical failure
message exists.
see the manual "Message Log Reference"and
perform the action described in [Action]
associated with each log message.
Go to "3.4 Network Interface
Communication
disabled.
Unicast communication
The route
Verify RA address
information
exists.
Distributed
Verify the filter
settings.
Failure."
distribution.
Not
distributed
Verify the RA
settings.
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