From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Tue Nov 01 2005 - 15:25:27 GMT-3
Scott -
Doesn't the default values in the router calculate the minCIR and 1/2
the CIR? I thought that if you configure the minCIR to be the same as
the CIR, then the adaptive calculation will have no effect, since it can
only downshift from the CIR to the minCIR values. Do I have something
backwards here?
Dave Schulz, CCDP, CCNP, CCSP
Project Manager / TAC Supervisor
Data Processing Sciences Corporation
10810 Kenwood Road
Cincinnati, Ohio 45242
Phone - (513) 791-7100 ext.7411
Fax - (513) 791-4676
Email: dschulz@dpsciences.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Scott Morris
Sent: Tuesday, November 01, 2005 11:04 AM
To: 'Sam Munzani'; ccielab@groupstudy.com
Subject: RE: Frame Relay traffic shaping question
For REAL LIFE stuff, consider this:
While it's nice to back off when the SP network says they're congested
(BECN/FECN), why on Earth would you choose to back off to a number less
than
what you are paying for??? In your config below, you pay for 128K CIR
to
the provider, yet you are telling your router it's ok to drop back to
64K
(mincir) when they complain. Yet, you still pay for it.
In your example though, you have a mathematical problem. 5 spokes at
guaranteed 128K CIR exceeds the hubs 512K CIR. Usually, PVCs are set up
where both ends have guarantees, so are you sure that your hub doesn't
really have 5 x 128K CIR's?
With mismatched numbers, you're going to find that things don't quite
add up
nicely and may take some playing with based on what applications you're
running and where they're going to. I would suggest though, that you
adjust
the CIR you are actually paying for, knowing that you can burst above
that
speed (SP burst, not your own configured burst) but don't back down less
than what you are guaranteed. That may mean adjusting your bill a bit.
FRTS is what you want to achieve. BECN's, FECN's and mincir is the bare
minimum that you will achieve from the SP standpoint (what you are truly
paying for in SP-based CIR).
HTH,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sam
Munzani
Sent: Tuesday, November 01, 2005 10:45 AM
To: ccielab@groupstudy.com
Subject: Frame Relay traffic shaping question
What's best approach for frame-relay traffic shape in following
configuration?
Hub (1024K line, 512K CIR)
|
------------------------------------------
| | | | |
Site A B C D E
All remote sites are 256K line speed with 128K CIR.
Here is my dilemma,
If I configure following parameters at all sites, the hub site will
start
shaping when it reaches 128K. If I configure hub site with 512K of CIR,
it
can saturate remote site since remotes are small CIR.
map-class frame-relay frame-shape
frame-relay cir 128000
frame-relay mincir 64000
frame-relay adaptive-shaping becn
frame-relay bc 8000
frame-relay be 16000
Here is the approach I am thinking of:
1. Configure hub with sub interfaces.
2. Have sub interface parameters match remote site paramters.
Does it make sense? Any better option?
Thanks,
Sam
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