3Com MSR 50 Series, Руководство по настройке

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Configuring X.25 over TCP (XOT) 307
Troubleshooting X.25
PAD
Symptom: Failed to log onto a remote device after placing an X.25 PAD call to the
remote device. The system prompted the destination address was unreachable.
Solution:
Check that:
■
The two ends of the X.25 PAD call are connected through an X.25 network and
the physical connection is normal. The serial interfaces used for connection are
encapsulated with X.25 and both of them support X.25 PAD. One end is DCE,
the other is DTE, both using the same encapsulation type (ietf or nonstandard).
■
The destination X.121 address is correct. It must be the one assigned to the
intended serial interface at server end.
■
Check that X.25 switching is disabled, or a route is available to the server end
when X.25 switching is enabled. In the former case, the default route is used to
route the call. In the second case, at least one route must be configured for
routing the call.
Configuring X.25 over
TCP (XOT)
Introduction to XOT
Protocol
X.25 over TCP (XOT) carries X.25 packets over TCP to interconnect two X.25
networks across an IP network. The following figure presents an XOT application
environment.
Figure 67 Typical XOT application
Set the delay waiting for the
response to an Invite Clear
message x29 timer inviteclear-time
seconds
Optional
Defaults to 5 seconds
Exit to user view quit -
Place an X.25 PAD call to the
specified X.121 address pad x.121-address Required
To do... Use the command... Remarks
IP network
Router B
Router C
Router D Router A
X.25 network X.25 network