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Failed to ping the other side with X.25 on both sides being up
Symptom
Despite X.25 being up on both sides, the other side cannot be pinged.
Analysis
The maximum length of frames set at one side is too small.
Solution
Enable the debugging on both sides. If one side discards incoming frames without delivering them to
the upper layer, it indicates the maximum length of frames set for this side is too small. Change the
frame length configuration of this side.
Troubleshooting X.25 configuration
Assume the layer 2 LAPB of X.25 is up.
X.25 of two sides always being down with LAPB of two sides
being up
Symptom
X.25 of two sides is always down although LAPB of two sides is up.
Analysis
A possible reason is the two sides are operating in the same mode (DTE or DCE).
Solution
Change the operating mode of one side, and make sure that one side operates in DTE mode and the
other in DCE mode.
Failed to ping the other side with X.25 on both sides being up
Symptom
Despite X.25 being up on both sides, the other side cannot be pinged.
Analysis
The following are possible causes:
• The local X.121 address is not configured.
• The address mapping of the two sides is not configured on the local end.
• The peer's X.121 address is not configured.
• The address mapping of the two sides is not configured on the remote end.
• The channel range is not correct.
• Some wrong user facilities are carried.
Solution
• If addresses are not correct, change them to the correct ones.
• For the last two causes, contact the network administrator to get the correct channel range and
user facilities.
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