Troubleshooting guide

10-42
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 10 Troubleshooting Ethernet, ATM Uplink, and POS Uplink Interfaces
Troubleshooting Packet-over-SONET Uplink with Enhanced Gigabit Ethernet Interface Modules
Displaying POS Interface Module Configurations
To display the interface configuration, use the following commands:
Follow these steps to troubleshoot the physical interface:
Step 1 Use the show interfaces pos card/subcard/port command to check the configuration.
Switch# show interfaces pos 3/0/0
POS3/0/0 is administratively down, line protocol is down
Hardware is Packet Over SONET
MTU 4470 bytes, BW 622000 Kbit, DLY 100 usec, rely 255/255, load 1/255
Encapsulation HDLC, crc 32, loopback not set, keepalive not set
Scramble enabled
Last input never, output never, 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 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 386 bytes, 0 no buffer
Received 0 broadcasts, 2 runts, 0 giants, 0 throttles
0 parity
3482907 input errors, 2 CRC, 0 frame, 3482903 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 applique, 3 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Switch#
Step 2 Check the POS field. If the link is down/down, start checking for active alarms and defects.
Troubleshooting here is similar to serial interface troubleshooting.
Alarm Red This alarm LED indicates one of
the following: LOS, LOF, LOP,
AIS-L, AIS-P, RDI-L, RDI-P,
UNEQ-P, or PLM-P.
Off No error.
Table 10-7 Packet-over-SONET OC-12c Uplink With Enhanced Gigabit Ethernet Interface Module LED
Descriptions (continued)
LED State Description
Command Purpose
show interfaces pos card/subcard/port Shows the status of the physical interface.
show controllers pos card/subcard/port Shows the interface memory management
and error counters.