controller E1 0/2: AIS detected

Unanswered Question
May 21st, 2008
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Hello,

We have a E1 line toward our ISP and this line is very unstable. Below is the syslog we get on our router:


%CONTROLLER-5-UPDOWN: Controller E1 0/2, changed state to down (AIS detected)


And below is the config on our E1 controller:


controller E1 0/2

framing NO-CRC4

channel-group 0 timeslots 1-24 speed 64

!


Please give us advices to solve the problem....


regards

Thanh

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drnteam Wed, 05/21/2008 - 02:43
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Thanh,


Check the framing and CRC set fron the ISP. If that is ON change turn on the framing and CRC on your side also. If that value mismatch you can notice that controller is going up and down.


Please Rate


Thanks and regards

Eldo

t511820 Wed, 05/21/2008 - 04:23
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Hi Eldo, thanks for quick respons..

Bellow is the network diagram of our network so that you can understand our problem better:


RouterA:E1 <--->ISP network with E1-T1 converter<--->RouterB:T1


RouterA#sho run


controller E1 0/2

framing NO-CRC4

channel-group 0 timeslots 1-24 speed 64

!


RouterB# show run

controller T1 0/0

framing esf

linecode b8zs

channel-group 0 timeslots 1-24 speed 64


Can you verify that these config. is correct.?


Best regards

Thanh

paolo bevilacqua Wed, 05/21/2008 - 04:34
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Hi, AIS either means the circuit is interrupted and out of service, or the device on the other end is turned off or shutdown. All these things you have to work with the SP.


Hope this helps, please rate post if it does!

t511820 Wed, 05/21/2008 - 04:48
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Hi, The ISP said that this error shoul be the time syncronization and they said that they do not provide clocking to both sides. I have tried to set master clock on E1 controller side, but no luck.


RouterA#

controller E1 0/2

framing NO-CRC4

channel-group 0 timeslots 1-24 speed 64

clock source internal


RouterB#

controller T1 0/0

framing esf

linecode b8zs

channel-group 0 timeslots 1-24 speed 64

!


Regards

Thanh

Pravin Phadte Wed, 05/21/2008 - 05:09
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add the below commands and try

controller E1 0/2

linecode hdb3

clock source line and also internal.


Let us know if it helps

t511820 Wed, 05/21/2008 - 05:29
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Hello Pravinxyz,

Please let me know why this will help us. We have try to "clock source internal", nut no help. Why "linecode hdb3" ? . I am affraid to do this , because it will affect the operation. The problem is the line is flapping 1 time in about 2 days..


Regards

Thanh

Pravin Phadte Wed, 05/21/2008 - 05:43
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The linecode hdb3 is a dafult line code for E1.


You can check it out in show controllers command and you will find it.


Some time we miss use default and which does create some problems and issue in the configuration and depends on how ios behaves.


It was just to confurm that all the conigs are done on the interface. As above it was also siad that this could be a line problem with the isp which i totaly agree.


As you said the flapping is 1 time in about 2 days would not be a big deal for me if the downtime is in seconds and is not casueing any problems to the production network.

In case if this is causing an outage to the network then you need to get it reolved.


I would also suggest to get the line tested from both the direction with the telco. A stress test.

t511820 Fri, 05/23/2008 - 03:30
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Hi Pra,

-The line code hdb3 is showed in show controllers command.

-The down time is usually quite long, about 1-2 hour. Our ISP usually says that the problems is not in their network.


-Thanh

paolo bevilacqua Wed, 05/21/2008 - 05:47
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One flaps time in two day is not bad. Are the serial if's up running ? Are these clean of errors ?

t511820 Fri, 05/23/2008 - 03:36
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Hi,

The serial int is up and running. Below is the output data for controller/int statistics:


Router A #show controllers E1

E1 0/2 is up.

Applique type is Channelized E1 - balanced

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20030807, FPGA: 11

Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 0.

Data in current interval (536 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

E1 0/3 is down.

Applique type is Channelized E1 - balanced

Far End Block Errors Detected

Receiver has loss of signal.

alarm-trigger is not set

Version info Firmware: 20030807, FPGA: 11

Framing is CRC4, Line Code is HDB3, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 0.

Data in current interval (542 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 542 Unavail Secs

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 86400 Unavail Secs

DE-DAR-EUM1#show int

DE-DAR-EUM1#show interfaces se0/2:0

Serial0/2:0 is up, line protocol is up

Hardware is GT96K Serial

Description: US-NOAA-EUM1-DARW_MARYLD_NP1

Internet address is 192.168.93.225/30

MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 48/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:00, output 00:00:01, output hang never

Last clearing of "show interface" counters 4d00h

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 3

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/16/256 (active/max active/max total)

Reserved Conversations 3/3 (allocated/max allocated)

Available Bandwidth 1072 kilobits/sec

30 second input rate 290000 bits/sec, 34 packets/sec

30 second output rate 7000 bits/sec, 9 packets/sec

5490528 packets input, 367054387 bytes, 0 no buffer

Received 38914 broadcasts, 0 runts, 0 giants, 0 throttles

7 input errors, 7 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort

2445395 packets output, 227715652 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

2 carrier transitions

Timeslot(s) Used:1-24, SCC: 3, Transmitter delay is 0 flags

Router A#


-Thanh

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