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CRCS errors on serial E1 links

Posted on 2009-02-16
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Last Modified: 2012-05-06
Dear Experts

the router has been taking hits , and iam experiencing CRC errors on the serial E1 link of the router, the serial E1 link is connected to another router via microwave links
- below are the follwoing outputs whi could analyze the problems

sh log
-  Feb 15 22:57:05.406: %CONTROLLER-5-UPDOWN: Controller E1 0/0, changed state to d
own (AIS detected) <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Feb 15 22:57:07.406: %LINK-5-CHANGED: Interface Serial0/0:0, changed state to re
set <<<<<<<<<<<<<<<<<<<<<<<<<< 
Feb 15 22:57:08.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0
, changed state to down <<<<<<<<<<<<<< 
Feb 16 03:00:17.405: %CONTROLLER-5-UPDOWN: Controller E1 0/0, changed state to u
p
Feb 16 03:00:19.405: %LINK-3-UPDOWN: Interface Serial0/0:0, changed state to up
Feb 16 03:00:20.569: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0
, changed state to up
==========================

UCC-Plant-Router#sh processes cpu history

UCC-Plant-Router   03:03:35 PM Monday Feb 16 2009 LCT


    4477777777777777777777888884444488888444447777755555444448
    8899999888888888899999000004444411111888881111188888999994
100
 90
 80   *************************     *****                    ***
 70   *************************     *****     *****          ***
 60   *************************     *****     **********     ***
 50 ***************************     ****************************
 40 ************************************************************
 30 ************************************************************
 20 ************************************************************
 10 ************************************************************
   0....5....1....1....2....2....3....3....4....4....5....5....
             0    5    0    5    0    5    0    5    0    5
               CPU% per second (last 60 seconds)

    8888888887888888888888988888888888888888898888889888888888
    4321200009200102022311035422201422020220222005526032212201
100                                                 *         *
 90                       * *                *   ** *         *
 80 ************************************************************
 70 *#****************#****###*##**#*##*****##******************
 60 *####**###**###*####**####################*###*##*#*##*#*##*
 50 ############################################################
 40 ############################################################
 30 ############################################################
 20 ############################################################
 10 ############################################################
   0....5....1....1....2....2....3....3....4....4....5....5....
             0    5    0    5    0    5    0    5    0    5
               CPU% per minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%
                           1                               111  1
    9999998988999899898997909984999658997999899557789697976000850999646564
    6999496407999690801928609916999155490973396320999498945000890290117930
100 **** *    *** *    *  ****  ***    * **  **     * * *  ***  * *        *
 90 ******** ********* ** ****  ***  *** *** **    ** * *  **** ****      **
 80 *************************** ***  *** ******   *** ***  **** ****      **
 70 ***#*********************** ***  **********  **** ********* ****  *   **
 60 ***#*#*****####************ ***************  ******************** *** **
 50 #*####****######************************************************* *** **
 40 #*####***########*******************************************************
 30 #######*##########******************************************************
 20 ####################****************************************************
 10 ##################################################################**####
   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
             0    5    0    5    0    5    0    5    0    5    0    5    0
                   CPU% per hour (last 72 hours)
                  * = maximum CPU%   # = average CPU%
-===================================
UCC-Plant-Router#sh interfaces Serial0/0:0 | inc CRC
      123 input errors, 47 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort <<<<<< 
- the CRCs has been increasing with the same rate every 3 days i clear the counters

- my question is as follows

- is there any troubleshooting steps to analyze these kind of problems
- if i need to test or perform an end-to-end loop test from the router interface, what configuration steps can be done on the router wan interface and how do  i dispaly the output from these tests bearing in mins that wan link that conects the 2 sites is a microwave links without any csu/dsu or dce being involved in middle
- the process-cpu utlization output seems to be high as per above but does this mean that this should reflext on the connectivity , or should result in the link flapping between the 2 sites ?
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Question by:oelolemy
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3 Comments
 
LVL 16

Expert Comment

by:memo_tnt
ID: 23650746
try make a loop by using RJ45 and a cable
and connect pins 1,2 4,5
and on the other side of the cable reverse them,,,
then connect it to your E1 interface and check its status if same thing
change its slot, if the same error try check another one
 
 
 
0
 

Author Comment

by:oelolemy
ID: 23651308
its still not clear to me , can you provide more details please and  how should i check the status ??
0
 
LVL 16

Accepted Solution

by:
memo_tnt earned 1500 total points
ID: 23656816
T1/E1 cross-over cable pin-out:::
1 <-> 4
2 <-> 5
4 <-> 1
5 <-> 2

then check logs ,, either by
sh controller e1 0/0
and
sh logging
or
type terminal monitor
 
 
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