Hitachi GR2000 Series - Manual (Page 233)

Troubleshooting
GR2K-GA-0015 7-67
Ver. 07-02
Step 2. Use the ping ipv6 command to check accessibility with relevant devices on
the route where the communication failed.
Step 3. When communication to the destination turns out to be missing with the
ping ipv 6 command, use ping ipv6 on the neighbor device to see if
communication to the destination is available.
Step 4. As a result of ping ipv6 command execution, go to Subsection 7.8.1.4,
“Inspection of NDP Information with Neighbor Device” when the failure
range is an adjacent router. Go to Subsection 7.8.1.5, “Inspection of
Unicast Routing Information” when it is a remote router.
7.8.1.3 Determination of Failure Range (Echo Test from Other End Device)
When or where login to the own router is not available, follow the procedure below to
determine the failure range of the communication from the other end device.
Step 1. Ensure that the other end device supports the ping ipv6 command.
Step 2. Use the ping ipv6 command to check accessibility between the other end
device and the destination.
Step 3. When communication to the destination turns out to be missing with the
ping ipv6 command, use ping ipv6 again to see if communication to the
destination from the device closest to the other end device is available.
Step 4. After determining the failure range by using ping ipv6 , and if the failure
turns out to be located in the own router, have the user or the service
personnel log in to the own router and investigate the failure cause
according to the troubleshooting flowchart (Figure 7-7).
7.8.1.4 Inspection of NDP Information with Neighbor Device
When communication to a neighbor host/router is unavailable with the ping ipv6
command, the address may not have been resolved by the NDP. Inspect the address
resolution status between this router and a neighbor device as follows:
Step 1. Log in to the own router from the device management terminal.
Step 2. Use the show ipv6 neighbors command to inspect the address resolution
status with the neighbor device (existence of NDP entry information).
Step 3. If the address for the neighbor device is resolved (ANDP entry information
exists), go to Subsection 7.8.1.5, “Inspection of Unicast Routing
Information”.
Step 4. Confirm that the IP network setting of the adjacent router coincides with
the router when the address between adjacent routers is not resolved (not
including NDP entry information).
7.8.1.5 Inspection of Unicast Routing Information
Confirm the route information which the router acquired, when communication is
not possible although the address between adjacent routers is resolved, when
communication becomes impossible halfway during IPv6 unicast communication, or
when the route to a communication peer is abnormal. The confirmation procedure is
described below.
Step 1. Log in to this router from the device management terminal.
Step 2. Use the show ipv6 route command to inspect the route information that
this device has obtained.
Step 3. Go to Section 7.9, “Communication failure in IPv6 unicast routing”, when
the route information of an interface in which a communication failure has