I need FRTS help or review

From: Jim Brown (Jim.Brown@xxxxxxxxxxxxx)
Date: Sun Aug 25 2002 - 17:04:24 GMT-3

   
Everything I have read about FRTS doesn't seem to clear up the use of BE,
BC, CIR, and MINCIR. I have been unable to locate a solid resource
explaining the concept with any finality.

I've read most of the relevant Usenet postings on Deja, watched the threads
on groupstudy, scoured CCO, and examined the QOS v1.0 course material.

I will throw out my assumptions and let list members either verify or shoot
holes on my take of FRTS.

A few definitions up front:

AR is the Access Rate or Port Speed of the connection to the frame relay
cloud. This is the maximum number of bits that can be transmitted to the
cloud.

CIR is the Committed Information Rate. This is the maximum number of bits
the provider promises to transmit. Anything above the CIR and below the
access rate will have the DE bit marked and is eligible for discard/drop
during times of congestion.

Lets take a hypothetical circuit for instance, a port speed of 96Kbps and a
CIR of 64Kbps.

The way I read the documentation, in a Cisco configuration CIR should be set
to the actual provider CIR or 64000. The BE or burst excess should be set to
the difference between the access rate and the CIR. I think BE should be set
to 32000, the difference between 96 and 64.

Here is a brief sample config:

map-class frame-relay TestShape
 frame-relay cir 64000
 frame-relay be 32000

The map-class could then be applied to the frame map or the interface. I was
previously under the impression you would set the Cisco CIR to the port
speed and the minCIR to the provider contracted CIR. I don't think this is
really the case?

Here is an example:

map-class frame-relay TestShape
 frame-relay cir 96000
 frame-relay mincir 64000

Comments or suggestions? Is this wrong, why or why not?

This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:37 GMT-3