Hi,
I'm having a problem with a serial interface line
protocol going up and down every few seconds. All i
can see is the the carrier trasitions increasing, this
is a fiber link, so i presume, there shouldn't be alot
of errors. I have changed the cable, still no luck.
Telco still says they have run loops and dont see any
thing wrong with the link. I have also changed encap
to PPP, still no luck
Attached is the show interface output
Serial1/5 is up, line protocol is up
Hardware is M8T-X.21
Description: Bussiness Systems Ltd
Internet address is 212.xx.xx.xx/30
MTU 1500 bytes, BW 1024 Kbit, DLY 20000 usec,
reliability 172/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:02, output 00:00:02, output hang
never
Last clearing of "show interface" counters 04:58:14
Input queue: 0/75/0 (size/max/drops); Total output
drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max
total/threshold/drops)
Conversations 0/8/256 (active/max active/max
total)
Reserved Conversations 0/0 (allocated/max
allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
208 packets input, 4992 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0
throttles
3946 input errors, 3059 CRC, 0 frame, 17 overrun,
0 ignored, 870 abort
5703 packets output, 451522 bytes, 0 underruns
0 output errors, 0 collisions, 707 interface
resets
0 output buffer failures, 0 output buffers
swapped out
707 carrier transitions DCD=up DSR=up
DTR=up RTS=up CTS=up
--More--
*Mar 28 03:25:33.997 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to down
*Mar 28 03:28:24.013 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to up
*Mar 28 03:28:44.025 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to down
*Mar 28 03:29:34.029 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to up
*Mar 28 03:29:54.029 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to down
*Mar 28 03:31:24.037 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to up
*Mar 28 03:31:26.029 gmt: %LINK-3-UPDOWN: Interface
Serial1/5, changed state to
up
*Mar 28 03:31:54.061 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to down
*Mar 28 03:32:04.057 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to up
*Mar 28 03:32:34.065 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to down
*Mar 28 03:32:44.065 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to up
*Mar 28 03:33:04.065 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to down
*Mar 28 03:33:14.065 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to up
*Mar 28 03:33:34.073 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to down
*Mar 28 03:34:34.081 gmt: %LINEPROTO-5-UPDOWN: Line
protocol on Interface Serial
1/5, changed state to up
*Mar 28 03:34:36.073 gmt: %LINK-3-UPDOWN: Interface
Serial1/5, changed state to
up
Thanx in advance
Maamun
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