CALCULATE FRAGMENT SIZE IN FRAME RELAY is there a formula??

From: Carlos Trujillo Jimenez (nergal888@hotmail.com)
Date: Sun Sep 02 2007 - 15:59:26 ART

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 - 12:01:09 ART