Mustafa Furat wrote: > > That' right... > But for me any reliability value less than 255/255 is a line > problem..
It's always a good idea to clear the counters in order to understand the rate of errors, in particular to determine whether the input and output errors are accumulating quickly at the present time. But you are right that the reliability figure can also be trusted without clearing the counters. The reason is that it's a 5-minute rolling average, with the most recent samples being weighted more heavily that older samples. Samples past 5 minutes ago aren't counted at all, from what I understand. The software calculates a sample every 5 seconds and provides a moving average over a 5-minute period. A moving average incorporates feedback from previous samples into the current result. The most recent sample is weighted more than previous samples, but because there are so many more previous samples in 5 minutes, they contribute to the result also. The weighting decays exponentially for each previous sample though, and as far as I know, samples past 5 minutes don't count at all. The details of the exponential average calculation are buried in a rather incomprehensible Cisco document titled �Definition of �bits/sec� from �sh int.�� The URL for the document is: http:// www.cisco.com/warp/public/66/3.html. Anyway, as far as troubleshooting the problem: It looks like it's on the 7200 side. In your mind, break the circuit at that side down into its components. Check cables and connectors from the router to the CSU/DSU, from the CSU/DSU to the demarc. Check for errors at the CSU/DSU. They can usually report a lot of errors. Do some loopback tests locally and then with the help of your provider. Cisco has a lot of info about troubleshooting serial lines here: http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1915.htm It might be sort of T1-focused though? But I think a lot would apply to DS-3 too. Good luck with it! _______________________________ Priscilla Oppenheimer www.troubleshootingnetworks.com www.priscilla.com > check the cables and connectors.. Did you change them?... > mustafa > > -----Original Message----- > From: Spio Wagus [mailto:[EMAIL PROTECTED] > Sent: Saturday, March 15, 2003 5:18 PM > To: [EMAIL PROTECTED] > Subject: RE: DS3 slow connection problem. [7:65491] > > > clear the counters on both routers and find out the rate of new > error > accumulation. > check the interface after say 5 mins and see if you get new > more errors > and > we can take it from there. > check the controllers for errors too. > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of > Mark Walmsley > Sent: Saturday, March 15, 2003 6:21 AM > To: [EMAIL PROTECTED] > Subject: DS3 slow connection problem. [7:65491] > > > Hi All, > > I need some help to troubleshoot a problem, I have a 7500 > router with a > ds3(45Mbps) connected to a 7200 ds3 (45Mbps). The line appears > to be > very > slow and is showing input errors on the 7200 and 7500 serial > interfaces. > Here's some info below from the serial interfaces on both the > 7200 and > the > 7500 showing the errors. > If you need more info please tell me what you need to see and > i'll post > it. > > Thanks very much for your help. > > 7200. > > Serial4/0 is up, line protocol is up > Hardware is M1T-T3 pa > Description: ****-DS3-**** > Internet address is ***.***.***.***/30 > MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, > reliability 254/255, txload 21/255, rxload 13/255 > Encapsulation HDLC, crc 16, loopback not set > Keepalive set (10 sec) > Restart-Delay is 0 secs > Last input 00:00:00, 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: > 2028 > Queueing strategy: fifo > Output queue :0/40 (size/max) > 5 minute input rate 2270000 bits/sec, 1660 packets/sec > 5 minute output rate 3721000 bits/sec, 1440 packets/sec > 5130206 packets input, 675673959 bytes, 0 no buffer > Received 0 broadcasts, 0 runts, 0 giants, 0 throttles > 0 parity > 70621 input errors, 68181 CRC, 0 frame, 601 overrun, 0 > ignored, > 1839 > abort > 4675498 packets output, 1691575679 bytes, 0 underruns > 0 output errors, 0 applique, 2 interface resets > 0 output buffer failures, 0 output buffers swapped out > 13 carrier transitions > rxLOS inactive, rxLOF inactive, rxAIS inactive > txAIS inactive, rxRAI inactive, txRAI inactive > > > 7500 > > Serial0/0/0 is up, line protocol is up > Hardware is cyBus PODS3 Serial > Description: ****-DS3-**** > Internet address is ***.***.***.***/30 > MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, > reliability 255/255, txload 8/255, rxload 19/255 > Encapsulation HDLC, crc 16, loopback not set > Keepalive set (10 sec) > Last input 00:00:00, output 00:00:00, output hang never > Last clearing of "show interface" counters never > Queueing strategy: fifo > Output queue 0/40, 215 drops; input queue 0/75, 0 drops > 5 minute input rate 3357000 bits/sec, 1318 packets/sec > 5 minute output rate 1502000 bits/sec, 1513 packets/sec > 256936267 packets input, 174282583 bytes, 0 no buffer > Received 0 broadcasts, 0 runts, 7 giants, 0 throttles > 0 parity > 159026910 input errors, 159025003 CRC, 0 frame, 1640 > overrun, 761 > ignored, 267 abort > 279300042 packets output, 2839210992 bytes, 0 underruns > 0 output errors, 0 applique, 1 interface resets > 0 output buffer failures, 0 output buffers swapped out > 619 carrier transitions > LC=up CA=down TM=down LB=down TA=down LA=down > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=65498&t=65491 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
