Cisco 857 speed limiting

[azaghul33]

Have had my 857W (IOS advsecurityk9-mz.124-15.T10) running for some time, recently changed to an 8Mb ADSL1 plan and if the download speed exceeds 725KBs (average) the router resets. I'm guessing it's suffering from a buffer over run and looses the plot.

I've tried applying

rate-limit input 7000000 7000000 7000000 conform-action transmit exceed-action drop

to the ATM and Dialer interfaces, but no success.

Have seen ways to limit speed by time of day (this would be ideal for peak/offpeak limits) but they can only be applied via class/policy maps which the 857's don't seem to support.

I've spent the past few hours searching for an answer without success...

Any advice appreciated

 

[burtsbees]

on the atm interface , lessen the clock rate...

atm0
clock rate aal5 7000000
clock rate aal2 2000000

You can tweak those values (hit the "?" to see options), but that should work.

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[azaghul33]

unfortunately I've no clock rate command under atm0

just updated to 124-15.T12 on the off chance, no change

 

[burtsbees]

rate-limit input 7000000 1500 8000 conform-action transmit exceed-action drop
rate-limit output 7000000 1500 8000 conform-action transmit exceed-action drop

Try those numbers.

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[azaghul33]

dropped it down to 6000000 so I should see a definite difference, but still no change.

the hard thing is picking the right torrents to force the download speed up that high.

as this router is ADSL2+ capable (24MB/s), i'm beginning to wonder if its not the equipment in the exchange resetting the link and can't keep up.

will try catching debug info to syslog to see if i can spot something there

 

[Minue]

Hello
At work we normally do CAR on the LAN interface.We have also tested some equipment that can't handle CAR,but I think with your link speed the 857 can.Try cranking down the speed some more,and post a "show interface x/x rate-limit" command.

Regards

 

[burtsbees]

Minue---I believe that if he puts CAR on the LAN interface, the packets will still go through the ATM interface, and won't get dropped until the LAN nterface...however, I think the problem is on the ATM interface, where the service is too much for some reason...never heard this one before...

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[azaghul33]

have tuned down the settings to 200000 8000 8000 on both input and output, and applied it to atm0, atm0.1, dialer0 and bvi1. all seem to have no effect, still hitting around 77KBs before i loose carrier. have managed to catch it on syslog (finally) with debug atm errors/events at 07-Mar-2010 18:27:52

i know, most people complain about links being slow... trust me to be different