I think this will help :
Measuring the Utilization of ATM PVCs
http://www.cisco.com/warp/public/121/pvc_utiliz.html
Regards.
A.
On Mon, 8 Jul 2002, Tito Basa wrote:
TB> Date: Mon, 08 Jul 2002 04:19:22 -0700 (PDT)
TB> From: Tito Basa <titobi@yahoo.com>
TB> To: cisco-nsp@puck.nether.net
TB> Subject: [nsp] atm vbr-nrt
TB> Resent-Date: Mon, 08 Jul 2002 07:24:39 -0400
TB> Resent-From: cisco-nsp@puck.nether.net
TB>
TB> Hi!
TB>
TB> I'm playing with a PA-A3-T3 on our new ATM
TB> link and vbr-nrt SIR15M/PIR30M
TB>
TB> when I monitored my traffic on MRTG I can only see
TB> traffic being clipped at 12.8Mbps. Is there a simple
TB> explanation for this (overhead?)as 48 bytes/53 bytes
TB> is not equal to 12.8/15 or did I miss something?
TB>
TB> below is my test config:
TB>
TB> interface ATM3/0
TB> no ip address
TB> no ip directed-broadcast
TB> no ip route-cache cef
TB> atm scrambling cell-payload
TB> no atm ilmi-keepalive
TB> no atm enable-ilmi-trap
TB> !
TB> interface ATM3/0.1 point-to-point
TB> description
TB> ip address x.x.x.x 255.255.255.252
TB> no ip directed-broadcast
TB> no atm enable-ilmi-trap
TB> pvc 1/32
TB> vbr-nrt 30000 15000 100
TB>
TB> is there anything I can do to get the 15 Mbps. I
TB> understand that PIR is quite diffrent from the
TB> usual definition of burst as described in the link
TB> below:
TB>
TB> http://www.cisco.com/warp/public/121/atm_vbrshape.shtml
TB>
TB> thanks in advance!
TB>
TB> tito
TB>
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