Verifying The Line Protocol Is Up - Cisco ASR 1000 Series Software Configuration Manual

Troubleshooting the Gigabit Ethernet SPAs
• Be sure that the cable is fully connected.
• Verify that the cable is not bent or damaged. If the cable is bent or damaged, the signal will be degraded.
• Verify that a hardware failure has not occurred. Observe the LEDs to confirm the failure. See the other
• Check the autonegotiation status.

Verifying the Line Protocol Is Up

In the output of the show interfaces gigabitethernet, show interfaces tengigabitethernet, or show interfaces
fastethernet command, verify that the line protocol is up. If the line protocol is down, the line protocol
software processes have determined that the line is unusable.
Perform the following corrective actions:
• Replace the cable.
• Check the local and remote interface for misconfiguration.
• Verify that a hardware failure has not occurred. Observe the LEDs to confirm the failure. See the other
Verifying the CRC Counter
In the output of the show interfaces gigabitethernet, show interfaces tengigabitethernet, or show interfaces
fastethernet command, observe the value of the CRC counter. Excessive noise will cause high CRC errors
accompanied by a low number of collisions.
Perform the following corrective actions if you encounter high CRC errors:
• Check the cables for damage.
• Verify that the correct cables are being used for the SPA interface.
Verifying the Carrier Signal
In the output of the show interfaces gigabitethernet, show interfaces tengigabitethernet, or show interfaces
fastethernet command, observe the value of the carrier signal counters. The lost carrier counter shows the
number of times that the carrier was lost during transmission. The no carrier counter shows the number of
times that the carrier was not present during transmission.
Carrier signal resets can occur when an interface is in loopback mode or shut down.
Perform the following corrective actions if you observe the carrier signal counter incrementing outside of
these conditions:
• Check the interface for a malfunction.
• Check for a cable problem.
OL-14127-17
troubleshooting sections of this chapter, and refer to the
Router Hardware Installation Guide
troubleshooting sections of this chapter, and refer to the
Router Hardware Installation Guide
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Cisco ASR 1000 Series Aggregation Services
. If the hardware has failed, replace the SPA as necessary.
Cisco ASR 1000 Series Aggregation Services
. If the hardware has failed, replace the SPA as necessary.
Verifying the Line Protocol Is Up
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