False carrier errors, line protocol bouncing

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Oct 8th, 2009
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I am seeing one of the swtich port on a ws-c2950T-24 switch port line protocol is bouncing and and show controllers ethernet-controller command shows 53 Symbol error frames, 1322 False carrier errors. also show interface command shows 53 input, 51 crc errors, 2 frame, 2 interface resets. Is the switch port going bad?

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rajibchicago Mon, 10/12/2009 - 06:13
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sorry for the delay

SW4#show controllers ethernet-controller f 0/14


Transmit Receive

224837717 Bytes 15723964 Bytes

2676458 Frames 135573 Frames

1454229 Multicast frames 102 FCS errors

1061466 Broadcast frames 16216 Multicast frames

0 Pause frames 1419 Broadcast frames

0 Single defer frames 0 Control frames

0 Multiple defer frames 0 Pause frames

0 1 collision frames 0 Unknown opcode frames

0 2-15 collisions 6 Alignment errors

0 Late collisions 0 Length out of range

0 Excessive collisions 108 Symbol error frames

0 Total collisions 2030 False carrier errors

0 Control frames 0 Valid frames, too small

0 VLAN discard frames 0 Valid frames, too large

0 Too old frames 13 Invalid frames, too small

0 Tagged frames 0 Invalid frames, too large

0 Aborted Tx frames 0 Discarded frames


Transmit and Receive

1034637 Minimum size frames

1666350 65 to 127 byte frames

47902 128 to 255 byte frames

61642 256 to 511 byte frames

849 512 to 1023 byte frames

638 1024 to 1518 byte frames

0 1519 to 1522 byte frames

rajibchicago Mon, 10/12/2009 - 06:14
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SW4#show interface fa 0/14

FastEthernet0/14 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 0019.55db.b70e (bia 0019.55db.b70e)

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)

Full-duplex, 100Mb/s, media type is 100BaseTX

input flow-control is unsupported output flow-control is unsupported

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

Last input 00:00:24, output 00:00:00, 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 1000 bits/sec, 2 packets/sec

135356 packets input, 15724992 bytes, 0 no buffer

Received 17636 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

108 input errors, 102 CRC, 6 frame, 0 overrun, 0 ignored

0 watchdog, 16217 multicast, 0 pause input

0 input packets with dribble condition detected

2676749 packets output, 224862486 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

rajibchicago Mon, 10/12/2009 - 06:16
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SW4#show log

Syslog logging: enabled (0 messages dropped, 1 messages rate-limited, 0 flushes,

0 overruns)

Console logging: level debugging, 1094 messages logged

Monitor logging: level debugging, 0 messages logged

Buffer logging: level debugging, 1095 messages logged

Exception Logging: size (4096 bytes)

File logging: disabled

Trap logging: level informational, 1099 message lines logged

Logging to xxxxxxxxxxxxx, 624 message lines logged


Log Buffer (4096 bytes):

o up

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to down

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to up

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to down

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to up

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to down

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to up

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to down

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to up

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to down

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to up

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to down

1w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/14, changed

state to up

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