A presentation at Melbourne Networkers suggested the following guidelines when
configuring frame relay traffic shaping (for data only, not voice).
This assumes that you remote site has a lower access rate than the central site
(or the same access rate).
At remote:
Set CIR to match line speed
Leave Tc at default (125ms), therefore don't set Bc
Set mincir = network 'real' CIR value
Don't set Be (default=0)
At Central:
Set CIR to match remote line speed
Leave Tc at default (125ms), therefore don't set Bc
Set mincir = network 'real' CIR value
Don't set Be (default=0)
So in your case you would set cir to 1536000 or whatever a T1 is (sorry, we use
E1s here), and mincir to 512000, and leave the rest to default.
However note that this will not stop your user from getting above 512 Kbps; it
will allow up to the full T1 unless there is congestion - if there is
congestion, it will gradually throttle back to 512 Kbps.
If you want to put a cap on the amount of bandwidth used, set the CIR parameter
to 512 Kbps. This works well (a little too well sometimes - the default value
for CIR is 56 Kbps. If you set a frame-relay class command but fail to have a
matching frame-relay map-class (e.g. mistyped name), your traffic is limited to
56 Kbps. This can be unfortunate :-)
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 18/07/2000 08:55
---------------------------
John lay <[EMAIL PROTECTED]> on 18/07/2000 07:46:40
Please respond to John lay <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: JENNY MCLEOD/NSO/CSDA)
Subject: Frame-relay traffic shaping question
Guys,
What are the parameters that I should configure on the router to control the
bandwidth usage of the user on a frame-relay configuration.
For instance, the user has T1 line and I need to provide him only 512k. Is
it the CIR, BE, BC, MINCIR, and traffic rate only ?
and how do I calculate them ?
Thanks a lot
ME
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