Hitachi GR2000 Series User Manual
Page 200
Hitachi Gigabit Router GR2000 Series Enhanced Version Operations - Device Management Overview
7-34
GR2K-GA-0015
Ver. 07-02
Step 3.
When communication to the destination turns out to be missing with the
ping
command, use ping on the neighbor device to see if communication to
the destination is available.
Step 4.
As a result of ping command execution, go to ((d) Inspection of ARP
Information with Neighbor Device) when the failure range is an adjacent
router. Go to (e) Inspection of Route Information when it is a remote router.
(c) 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
command.
Step 2.
Use the
ping
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
command, use ping 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, 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.
(d) Inspection of ARP Information with Neighbor Device
When communication to a neighbor host/router is unavailable with the
ping
command, the address may not have been resolved by the ARP. The procedure for
confirming the address resolution status with the neighbor device is given below:
Step 1.
Log in to the own router.
Step 2.
Use the
show ip arp
command to inspect the address resolution status with
the neighbor device (existence of ARP entry information).
Step 3.
If the address for the neighbor device is resolved (ARP entry information
exists), Go to (e) Inspection of Route Information.
Step 4.
Confirm that the IP network setting of the adjacent router is available to
communicate with the router when the address between adjacent routers is
not resolved (not including ARP entry information).
(e) Inspection of Route Information
Communication may be disabled in the middle of the route to the destination, or the
route might not be working properly, even though the address for the neighbor host/
router is solved. The procedure for confirming the route information that this device
has obtained is given below.
Step 1.
Log in to this router.
Step 2.
Use the
show ip route
command to inspect the route information that this
device has obtained.
Step 3.
Go to Section 7.6, “Communication failure in IPv4 unicast routing”, when
the route information of an interface in which a communication failure has
occurred is not contained in the route information that the router acquired
or when the next hop address is illegal.
Step 4.
A problem is judged to exist in the functions below that are set to the
interface in which communication is not possible when the route
information of an interface in which a communication failure has occurred