From: nilsi2002@gmail.com
Date: Fri Sep 07 2007 - 18:41:49 ART
It was certainly informative to see all the background information from the experts but I wonder if it is enough to calculate it this way?
CIR 256K
Since you have voice packets you can assume that you are allowed to choose a Tc of 10mSec. That will yield 256000 * 0.01 = 2560 (Bc)
So there are 2560 bits per interval... this yields a fragment size of 2560/8=320bytes
Does one need to specify "fragment" to trigger FRF.12?
Rich
-----Original Message-----
From: nobody@xxxxxxxxxxxxxx on behalf of Carlos Trujillo Jimenez
Sent: Sun 02-Sep-07 11:59 AM
To: ccielab@xxxxxxxxxxxxxx
Cc: ctrujillo@xxxxxxxxxx
Subject: CALCULATE FRAGMENT SIZE IN FRAME RELAY is there a formula??
Dear partners.
Please I want you to confirm if I am correct or not in the answer of the
following task.
Scenario:
Data and voice packets are traversing the frame relay circuit between RA and
RB.
Enable frame relay traffic shaping in a interface according to the provided
CIR (256 K). and ensure all the shaping intervals are the smallest possible,
and that a single packet cannot take more than one interval to be
transmited.
so in each router I enable frame relay traffic shaping, associating the
following map-class
map-class frame-relay SHAPING
frame relay cir 256000
frame relay bc 2560
frame relay fragment 320
For the last one "FRAME RELAY FRAGMENT 320" what is the formula for
calculating it?? I mean I know that when larga packets exced the 320 size,
they get compressed right?, but how do I get the 320 size?? is there a
formula to calculate it??
I noticed also when I do a "show traffic shape" without enabling
fragmentation it shows me the following response:
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
402 256000 320 2560 0 10 320 -
403 256000 320 2560 0 10 320 -
405 256000 320 2560 0 10 320 -
406 256000 320 2560 0 10 320 -
413 256000 320 2560 0 10 320 -
506 256000 320 2560 0 10 320 -
513 256000 320 2560 0 10 320 -
401 256000 320 2560 0 10 320 -
So my question is, for calculating the fragment size, I simply copy the
value of the "byte limit" who shows me the show traffic shape output??
Thanks a lot, and regards.
This archive was generated by hypermail 2.1.4 : Sat Oct 06 2007 - 12:01:10 ART