Available bandwidth calculation with prior to IOS 12.2

From: forwardtruth@yahoo.com
Date: Sat May 06 2006 - 04:36:07 ART


IEWB-RS Lab6 V3 Task 8.1 Breakdown

class-map match-all FTP
match protocol ftp
!
policy-map QOS
class FTP
bandwidth percent 50
!
interface FastEthernet0/0
service-policy output QOS
!
R1#sh queue e0/0 | in Available
Available Bandwidth 7500 kilobits/sec

Although 50% of the bandwidth on this interface is reserved for FTP, it is
a relative reservation of what is available. Since the available bandwidth on the
interface is 7.5Mbps, FTP is effectively guaranteed a minimum of 3.75Mbps
(50% of 75% of 10Mbps).

Since with the older IOS (prior to 12.2) it is relative no absolute, that means 50 % is from 7.5 Mbps (not from 10 Maps) which is equal to 3.75 Mbps.

If we do calculation for the above assumption:
7500  (50*7500/100) = 3750

Should not the available bandwidth be 3750 kbps, instead of 7500 kbps (R1#sh queue e0/0 | in Available
Available Bandwidth 7500 kilobits/sec) ?



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