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Serial connection problems, including interface and line protocol status, output drops, input drops, input errors, interface resets, and carrier transitions

Core Issue

These are some of the reasons these issues occur:

  • Clocking problems
  • Faulty cabling 
  • A TELCO line is down.
  • Keepalives are not sent by a remote router. 
  • Noisy line

Resolution

For a workaround, perform these steps:

  1. Issue the Router # sh interfaces serial < ID > command in EXEC mode.
  2. From the output, check the first line. This gives the interface status.

For additional information, refer to table 15-1 in the Serial Lines: show interfaces serial Status Line Conditions section of Troubleshooting Serial Line Problems.

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