Hitachi GR2000 Series - Manual (Page 192)

Hitachi Gigabit Router GR2000 Series Enhanced Version Operations - Device Management Overview
7-26 GR2K-GA-0015
Ver. 07-02
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.
7.5.1.5 Inspection of ARP Information with Neighbor Device
When communication to a neighbor host/router is unavailable with the result of ping
command execution, the address may not have been resolved by the ARP. 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 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 Subsection 7.5.1.6, “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 ARP entry information).
7.5.1.6 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 IPv4 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 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
is contained in the route information that the router acquired. Examine the
relevant function.
Multicast routing
Go to Subsection 7.5.1.7, “Inspection of Multicast Information”.
Filtering/QoS function
Go to Subsection 7.5.1.8, “Inspection of Filtering/QoS Definition
Information.
Policy Routing function
Go to Subsection 7.5.1.10, “Inspection of Policy Routing Definition
Information.
Tag-VLAN function
Go to Subsection 7.5.1.11, “Confirmation of Tag-VLAN Setting
Information.
NAT/NAPT function
Go to Subsection 7.5.1.10, “Inspection of Policy Routing Definition
Information.