Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

VIP Purple

SDSL line flaps with high load

Hello all,

I have a Cisco 2611XM with a G.SDSL module installed. The 2MB SDSL goes down when the load on the circuit is roughly above 80%. The ATM interface actually goes down and then back up again. I have replaced the entire router, upgraded to the latest IOS (12.3) but to no avail.

Has anyone experienced similar problems ?

Thanks for sharing your thoughts.


Georg Pauwen

  • Other Network Infrastructure Subjects
Cisco Employee

Re: SDSL line flaps with high load

One other possibility is that errors are occuring on the line. When the load increases, the amount of errors may become too big leading the DSL module to restart the link. Check show dsl interface and the controllers to see if errors are recorded.

New Member

Re: SDSL line flaps with high load

I am experiencing the same problem with G.SHDSL on 1760 routers. When the load gets high, the circuit flaps. I am using a fire alarm circuit between two 1760's connecting a training center with our main office. The loads in my situation do not approach 80%, more like 65%. I have also upgraded IOS, but have not changed hardware. In back to back testing, I do not experience the flapping, of course I cannot recreate the realtime loads in my test enviroment. I have had the local telco check the line and it shows clean, no loading, etc. I have checked the controllers, there are no errors. Any insight will be greatly appreciated.

Thank You,

Dave Muncey

This widget could not be displayed.