Cisco ASR 1000 Configuration Guide

20-4
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
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Chapter 20 Troubleshooting the Serial SPAs
Performing Basic Interface Troubleshooting
0 output buffer failures, 0 output buffers swapped out
2 carrier transitions
Table 20-1 shows the interface status conditions, possible problems associated with the conditions, and
solutions to those problems.
Ta b l e 20-1 Serial Lines: show interfaces serial Status Line Conditions
Status Line 
Condition Possible Problem Solution
Serial x is up, line
protocol is up
— This is the proper status line condition. No action is
required.
Serial x is down,
line protocol is
down
The router is not sensing a
carrier detect (CD) signal
(that is, the CD is not active).
The line is down or is not
connected on the far end.
Cabling is faulty or incorrect.
Hardware failure has
occurred in the channel
service unit/data service unit
(CSU/DSU).
1. Check the CD LEDs to see whether the CD is
active, or insert a breakout box on the line to
check for the CD signal.
2. Verify that you are using the proper cable (see
your hardware installation documentation).
3. Insert a breakout box and check all control
leads.
4. Contact your leased-line or other carrier service
to see whether there is a problem.
5. Swap faulty parts.
6. If you suspect faulty router hardware, change
the serial line to another port. If the connection
comes up, the previously connected interface
has a problem.

Cisco ASR 1000 Specifications

General

Brand	Cisco
Model	ASR 1000
Category	Network Router
Language	English