Troubleshooting a Leased Line Connection
19-8 PortMaster Configuration Guide
Troubleshooting a Leased Line Connection
Use the information in this section to debug your configuration.
If you have trouble with a leased line connection, verify the following:
• Enter the following commands to view the PPP negotiation on port S1, if this is the
port you are using:
Command> set console s1
Command> set debug 0x51
Command> reset s1
For information about the interpreting the results of the debug command, refer to
the
PortMaster Troubleshooting Guide
.
After you verify that the PPP negotiation is correct, enter the following commands
to turn off the debug utility:
Command> set debug off
Command> reset console
• The error counters should be 0 (zero) except for abort errors. If your counters are
nonzero, the problem is external to the PortMaster.
Note – CRC errors will occur if the cable is ever unplugged from the PortMaster.
• Verify that you are using the correct cable and that it is attached securely to the
correct port. Not all WAN ports are capable of the same speeds.
• Verify that the DIP switch next to the synchronous port is set to V.35 for Lucent
cables and that you are plugged into the correct V.35 interface on your CSU/DSU.
• Verify that the CSU/DSU is providing the clock to the PortMaster. The CSU/DSU can
generate the clock or receive it from the carrier.
• Verify that the CSU/DSU is configured properly.
• If you have a Cisco router on the other end of your connection, make sure that it is
running Cisco’s software release 9.14(5) or later and is using PPP encapsulation, not
High-Level Data Link Control (HDLC).
• If the framing errors are greater than 0, verify that the router on the other end of
the connection is running the PPP protocol.
✍
