Information Technology Reference
In-Depth Information
Table19-1
X.25: No Connections over X.25 Link (continued)
Possible Problem
Solution
Protocol
parameters are
misconfigured.
(continued)
1.
Enable the
debug lapb
privileged exec command and look
for SABMs being sent. If no SABMs are being sent, disable
the
debug lapb
command and enable the
debug x25 events
privileged exec command.
2.
Look for RESTART messages (for PVCs
6
) or CLEAR
REQUESTS with nonzero cause codes (for SVCs
7
).
To interpret X.25 cause and diagnostic codes provided in the
debug x25 events
output, refer to the
Debug Command
Reference
.
Verify that all critical LAPB parameters (modulo, T1, N1,
N2, and k) and the critical X.25 parameters (modulo, X.121
addresses, SVC ranges, PVC definitions, and default
window and packet sizes) match the parameters required by
the service provider.
3.
