3Com 10014299 manual Set its X.121 address as, Fault Diagnosis Troubleshooting

72CHAPTER 4: TERMINAL SERVICE

cEnter the view of interface Serial 0 and set its link layer protocol as X.25 DTE IETF.

[RouterA]interface serial 0 [RouterA-serial0]link-protocol x25 dte ietf

dSet its X.121 address as 123456.

[RouterA-serial0]x25 x121-address 123456

2Configure Router B:

aEnter the view of interface Serial 0 and set its link layer protocol as X.25 DTE IETF.

[RouterB]interface serial 0 [RouterB-serial0]link-protocol x25 dte ietf

bSet its X.121 address as 5678.

[RouterB-serial0]x25 x121-address 5678

cReturn to the system view and place the X.25 PAD call to router A

[RouterB] pad 123456

Trying 123456...Open

Username:paduser

Password:

User paduser logged in.

[RouterA]

Fault Diagnosis and

Troubleshooting of X.25

PAD

Fault one: If after X.25 calls a remote terminal, logon fails. The screen displays Trying xxxxxxxxxx...Destination unreachable.

Troubleshooting: Follow the steps below.

■X.25 protocol is encapsulated on the serial port that is used for connection and both ends support X.25 PAD protocol.

■After the above condition is met, make sure that the serial port at the Server side used to receive X.25 calls has set the X.121 address and the address is correctly called at the Client side.

■After the above conditions are satisfied, then you should confirm that the serial interface used to accept the X.25 PAD calls at the Server end has specified the X.121 address, and the Client has correctly called this address.

■If the above condition is also satisfied, please check if the Client side has set switch attributes (i.e., x25 switching command is used under system view), but does not set the route to the Server side. If so, the data cannot be transmitted from the Client side to the Server side in the packet mode. It is not mandatory for the Client side to configure the route to access the Server, though. If the Client side does not configure switch attributes, X.25 will choose the default route for the call. Therefore, please confirm that the Client side is not configured with the switch attributes or the Client side is configured with the switch attributes as well as the route to the Server side.