[c-nsp] atm ubr settings?

[Clayton Zekelman]

Opening up all your PVC's to full line rate is fine if you don't care if a DoS attack against one customer floods out all your customers.

Also, if your telco starts enforcing PVC size by policing your traffic, you'll find your customers will start getting huge amounts of packet loss.

If your carrier polices at a PIR of 8000, and you're sending traffic with no shaping, you're most certain to get cell discards.

It sounds as if the other "engineer" is speaking from limited experience.  Just because it works doesn't mean its correct.

----- Original Message ---------------

Subject: [c-nsp] atm ubr settings?
   From: goemon at anime.net
   Date: Mon, 3 Apr 2006 15:42:59 -0700 (PDT)
     To: cisco-nsp at puck.nether.net

>I am arguing with another engineer over provisioning of our customer ATM 
>PVCs.
>
>His argument goes something like:
>
>"Configuring every ubr pvc to 45mbps by default does not hurt anything, 
>regardless if the customer's circuit is telco provisioned for 256k or
>1.544mbps or anything else. Therefore, this is a valuable method to 
>prevent us from having to waste any time ever configuring customer pvcs 
>at all"
>
>He justifies his position with some tcp download tests of the pvc set for 
>the proper (telco provisioned) line rate, and then comparing it to tcp 
>download tests with the pvc set to ubr 45mbps, and seeing "no difference".
>
>I suspect this is a bad idea, but I would like an ATM expert's input on this.
>
>-Dan
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