Slip Sec on E1

Unanswered Question
Oct 3rd, 2007

I Have a WIC/VIC/HWIC Card installed in a Cisco 2800. The Layer 2 is estabhlished but I am get very Large amounts of Slip Sec errors. I have had the Telco check the Line and all appears fine. The Controller is set to Line, but I have also tried Internal. The Telco are convinced this is a Issue with the Wic Card

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 3 (1 ratings)
royalblues Wed, 10/03/2007 - 04:57

Is it Possible for you to test the circuit with another WIC card?


Paolo Bevilacqua Wed, 10/03/2007 - 10:55

Please configure:

network-clock-participate wic X

network-clock-select 5 E1 X/0

and the slips will go away.

Hope this helps, please rate post if it does!,/i>

Mikha_Manakhov Tue, 10/16/2007 - 07:57


I do had the same problem, and I put clock source internal under e1 controller and Slip Secs error had gone. I have 6 E1 interfaces bundled as multilink and one of the interface kept getting error which was caused time out after some number of replies when I tried ping remote sites.

I just wanna ask if I have got sever E1 controller, do I need to put network-clock-participate wic X

network-clock-select 5 E1 X/0 for each slots?

thanks a lot in advance



Paolo Bevilacqua Tue, 10/16/2007 - 11:24

first of all, if the port are connected to telco circuits, you must configure clock source line on them all.

Then, you have to configure network-clock-participate for all the WIC involved, and network-clock-select with different priorities for all the circuits.

In reality the latter command is need only icase one or more circuits go down.

Mikha_Manakhov Wed, 10/17/2007 - 23:54

It`s strange, but I configure clock source to be internal on two E1 (clock source of other 4 E1 forming multilink are line) which are connected to telco circuirs and all Slip Secs error disappeared. I did not configure network-clock-participate at ala on my router. I wonder if it is one of the solution to get rid of slip sec error? Could you explain more about using network-clock-participate and network-clock-select command if possible? thank a lot


Paolo Bevilacqua Thu, 10/18/2007 - 02:19

Hello, the commands are needed to form a reliable clock source. Without them, you can have unpredictable results.


This Discussion