Cisco 1800 Serial WAN Link Unstable

140 pts.
Tags:
Cisco 1800
Serial Link
WAN
I have a 1800 and the Serial link to a remote site keeps shutting down everytime there's traffic going over it. when I do a "no shut" it comes up for a while and as soon as there's even a ping being sent, it will go to a "shut" state
ASKED: March 31, 2009  2:19 PM
UPDATED: April 1, 2009  5:24 PM

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Contact your circuit provider and have them run analyses (BERT, clocking, etc.) on the link.

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  • Bahlezi
    I have asked them to run tests and they say there's no problem on my circuit....Could there be an issue with the hardware (cable) though? I honestly don't think so.
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  • Bahlezi
    Open a support case with Cisco. But be sure that you have updated the IOS on the gear.
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  • AKAdmin
    Before you open an expensive case with Cisco....Do you have CSU/DSU's on the customer side of the circuit on both ends? If so, those devices have built in loopback and testing capabilities. You should be able to send a loopback command to the far end and run your own Bit Error Rate Test (BERT). If it fails you know it is not in the serial cable. It is either in local, inhouse wiring, the service provider's cirucuit, the remote inhouse wiring or (rarely) the CSU/DSU itself. I tested a lot of circuits as a phone company data tech for 20 years. I found that, if the CSU/DSU test failed, about 80 % of the time the problem was in customer wiring and about 20% of the time it was in the Telco's equipment.
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