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 __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=39766&t=39766 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]