How to resolve this problem?

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Mar 14th, 2009
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I having cisco router(2600) with 2 serial interfaces. One interace s0/0 connected to 2 mpbs internet leased line and aother interface s0/1 connected to another 2 mbps internet line . Totally i m having 4 mpbs internet leased line. One interface frequently going down and up

Log messages shown below


Syslog logging: enabled (0 messages dropped, 0 flushes, 0 overruns)

Console logging: level debugging, 2339 messages logged

Monitor logging: level debugging, 0 messages logged

Buffer logging: level debugging, 2339 messages logged

Trap logging: disabled


Log Buffer (4096 bytes):

col on Interface Serial0/1, changed state to down

Mar 14 15:03:39: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:03:40: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:04:28: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:04:29: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:04:56: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:04:57: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:07:28: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:07:29: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:07:55: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:07:56: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:09:30: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:09:31: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:09:48: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:09:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:11:06: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:11:07: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:11:24: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:11:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:13:25: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:13:26: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:13:43: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:13:44: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:14:22: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:14:23: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:14:40: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:14:41: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:15:33: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:15:34: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:15:51: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:15:52: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:17:20: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:17:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:17:38: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up

Mar 14 15:17:39: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to up

Mar 14 15:18:52: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

Mar 14 15:18:53: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, chan

ged state to down

Mar 14 15:19:18: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up


How to resolve this prob? I have attaced the log file as an attachment.



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Giuseppe Larosa Sat, 03/14/2009 - 06:14
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Hello Vinoth,

to troubleshoot this issue:


use

sh int ser0/1 repeatedly and save the outputs on a text editor.

Try to see if there are incrementing errors and note what type of errors are.


note also the Last input line if the time increments the link is unidirectional


to check that your serial interface is healthy use:

debug serial interface

verify that the my sequence number increments over time


Call the provider and have them perform loopback tests: the link is probably too errored or unidirectional in this moment


Hope to help

Giuseppe


JamesLuther Sat, 03/14/2009 - 10:42
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Hi,


I would call your telco and arange a circuit test.



Regards

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