Troubleshooting - HP MSR Router Series Wan Access Configuration Manual

Troubleshooting

Symptom
Two devices cannot ping each other over an ISDN PRI or BRI line.
Analysis
The following are typical ISDN call failure causes:
• The ISDN interface is not configured or activated.
The dial-up configuration is incorrect.
•
The line is not well connected.
•
Solution
To resolve the problem:
1. Execute the display isdn call-info command to verify the interface settings:
If the command displays nothing, configure an ISDN interface. For more information about
a.
configuring BRI, CE1/PRI, and CT1/PRI interfaces, see Interface Configuration Guide.
b. Verify the Q.921 state of the PRI or BRI interface:
−
−
−
2. Verify that the physical layer is active:
a. Enable Q.921 debugging.
b. If the system displays a "Failed to send" message, execute the shutdown and undo shutdown
command to re-enable the interface.
3. Verify that the dial-up configuration is correct.
4. Verify that the ISDN cables are securely connected.
If the PRI interface's link layer 1 is not in ISDN MULTIPLE_FRAME_ESTABLISHED state,
Q.921 negotiation has failed. You must check Q.921 settings or the physical connection.
If any link layers of the BRI interface are not in TE1_ASSIGNED state, Q.921 negotiation has
failed. You must check Q.921 settings or the physical connection.
If the Q.921 state is correct, verify the dialup configuration.
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