1721 router dropping ethernet interface

[takaiwana]

my 1721 router is displaying the following message at regular intervals: PQUICC_ETHER-1-LOSTCARR: Unit 0, lost carrier. Transceiver problem?

loading of the ios is also very slow. any clues of of what is causing the problem?

thanks.

[erikhjacobsen]

Please post the output of the show proc cpu and show int fa0 commands.

[takaiwana]

Ethernet0 is up, line protocol is down

Hardware is PQUICC Ethernet, address is 0004.dd0d.0aaf (bia 0004.dd0d.0aaf)

Description: Ethernet Link to Zimbabwe ISP

Internet address is 217.15.121.106/29

MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

reliability 137/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Half-duplex, 10BaseT

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output 00:00:06, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

86 input errors, 0 CRC, 0 frame, 0 overrun, 86 ignored

0 input packets with dribble condition detected

86 packets output, 5456 bytes, 0 underruns

86 output errors, 0 collisions, 1 interface resets

0 babbles, 0 late collision, 0 deferred

86 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

FastEthernet0 is up, line protocol is up

Hardware is PQUICC_FEC, address is 000b.be95.ff08 (bia 000b.be95.ff08)

Description: LAN Interface - Zimbabwertr

Internet address is 10.5.0.1/24

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Auto-duplex, 10Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 4/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1000 bits/sec, 2 packets/sec

5 minute output rate 0 bits/sec, 1 packets/sec

1340 packets input, 118560 bytes

Received 348 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog

0 input packets with dribble condition detected

714 packets output, 139812 bytes, 0 underruns

2 output errors, 0 collisions, 1 interface resets

0 babbles, 0 late collision, 0 deferred

2 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

Virtual-Access1 is up, line protocol is up

Hardware is Virtual Access interface

MTU 1492 bytes, BW 100000 Kbit, DLY 100000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Base PPPoE vaccess, loopback not set

DTR is pulsed for 5 seconds on reset

Last input never, output never, output hang never

Last clearing of "show interface" counters 00:13:15

Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

even if the router is not connected to a hub or switch the error message of lost carrier still appears.

[klauset]

Sounds physical.

Most often, "Lost carrier" indicates a physical problem. Check your cabling - replace the drop cable, try another switch/hub port, test with a cross-over cable directly to a NIC if you can.

Also, be sure to lock your interface speed and Full-Duplex/Half-Duplex settings. "Auto negotiation" too often is neither.

[takaiwana]

the problem is occuring even when nothing is connected on the ethernet port.