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72 CHAPTER 4: TERMINAL SERVICE
c Enter 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
d Set its X.121 address as 123456.
[RouterA-serial0]x25 x121-address 123456
2 Configure Router B:
a Enter 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
b Set its X.121 address as 5678.
[RouterB-serial0]x25 x121-address 5678
c Return 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.