Troubleshooting guide

5-22
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-02
Chapter 5 Troubleshooting Switch Router ATM Interface Connections
Troubleshooting 155-Mbps and 622-Mbps Interfaces
Follow these steps to troubleshoot a 155-Mbps or 622-Mbps physical interface:
Step 1 Use the show interfaces atm card/subcard/port command to check the configuration.
Switch# show interfaces atm 1/0/0
ATM1/0/0 is up, line protocol is up
Hardware is oc3suni
MTU 4470 bytes, sub MTU 4470, BW 156250 Kbit, DLY 0 usec, rely 255/255, load 1/255
Encapsulation ATM, loopback not set, keepalive not supported
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 2000 bits/sec, 6 packets/sec
5 minute output rate 3000 bits/sec, 9 packets/sec
4703704 packets input, 249296312 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
54 input errors, 55 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
5737496 packets output, 304087288 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Switch#
Step 2 Check the ATM field to see whether the interface is up.
If down, check for the following:
• Disconnected or faulty cabling—Check cables.
• Hardware failure—Swap hardware.
If administratively down, the interface has been administratively taken down. Use the no shutdown
interface configuration command to reenable the interface.
Step 3 Check the line protocol field to see whether the status is up.
If down, check for the following:
• The line protocol software processes might have determined that the line is unusable. Try swapping
the cable.
• The local or remote interface might be misconfigured. Check the interface configuration.
• Clocking might be misconfigured or the source interface might have failed. Refer to the “Initially
Configuring the ATM Switch Router” chapter in the
ATM Switch Router Software Configuration Guide.
• Hardware might have failed. Try swapping the port adapter.
Step 4 Check the Encapsulation field. Confirm that the encapsulation method matches the interface type.
Step 5 Check the Last input and Last output fields. They show the number of hours, minutes, and seconds since
the last packet was successfully received or transmitted by the interface.
Step 6 Check the output hang field. It shows the number of hours, minutes, and seconds since the last reset
caused by a lengthy transmission.