Hitachi GR2000 Series - Manual (Page 212)

Hitachi Gigabit Router GR2000 Series Enhanced Version Operations - Device Management Overview
7-46 GR2K-GA-0015
Ver. 07-02
In the state where RP congestion occurs, packets for monitoring PPPoE session
connection may be discarded and the session may be disconnected. (However, the
session is automatically reconnected when it has been set so that it is reconnected
by the automatic reconnection time (auto_connection) of a configuration definition
command (CLI type 1) (PPPoE). In this case, notice that the log message below is
collected.
E4 PPPoE NIF:x LINE:x 00020008 0850 :000000000000 :
Disconnection of PPP session detected via Link Status Monitoring. Check
the line cable connection with modem/ONU and the peer router’s status.
7.5.3.2 Determination of Failure Range (Echo Test from This Router)
When no failure is found in the own router, a failure may exist somewhere in the
route between this router and the destination. To determine the failure range from
this router, follow the procedure below.
Step 1. Log in to the own router.
Step 2. Use the ping command to check accessibility with relevant devices on the
route where the communication failed. (See Subsection 5.2.2, “Confirming
the communication with relevant destination address” for an example of
ping operation and how to read the execution result.)
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 Subsection 7.5.3.4,
“Confirmation of PPPoE Session Status” when the failure range is an
adjacent router. Go to Subsection 7.5.3.5, “Inspection of Route
Information” when it is a remote router.
7.5.3.3 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 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.
7.5.3.4 Confirmation of PPPoE Session Status
Even if the hardware in this device is operating normally, it is still possible for an
impediment to occur in the hardware in the adjacent connected device.
The procedure is given below on how to confirm the PPPoE session status between
this device and the adjacent device.