From: Todd.Osterberg@compucom.com
Date: Wed Apr 05 2006 - 00:41:19 GMT-3
I am trying to understand how IOS works under the hood, so to speak,
when performing frts. I understand the formula of T=Bc/CIR. If I
configure a map-class with a CIR value why do I need to specify a Bc.
Since the default of T is .125 seconds and I have then provided the CIR,
why doesn't IOS solve for Bc? Here is my configuration example:
Initial configuration:
map-class frame-relay frts
frame-relay cir 128000
Rack1R1#sh traffic-shape
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment
Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
105 128000 2000 128000 0 125 2000 -
When the map-class is modified to include a Bc, the results are
different:
map-class frame-relay frts
frame-relay cir 128000
frame-relay bc 16000
Rack1R1#sh traffic-shape
Interface Se0/0
Access Target Byte Sustain Excess Interval Increment
Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
105 128000 2000 16000 0 125 2000 -
Any thoughts as to why FRTS works this way?
Todd
Todd Allen Osterberg
Senior Consultant, Professional Services US Western Region
CompuCom
eMail: todd.osterberg@compucom.com
T: (916) 577-1066
C: (916) 316-4650
www.CompuCom.com
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