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Bandwidth Allocation on 12.3 release

justinvo
Level 1
Level 1

Hi All,

I'm having difficulty of finding any document regarding how IOS 12.3 calculate it's bandwidth check.

Assuming that my frame relay traffic is 128K.

Under 12.2, I was able to define the BW for priority queue e.g. 32kbps and assign the sum of other classes up to 100% if I wanted to. Another word, priorty queue is not included into the bandwidth percentage calculation.

Under 12.3, I can't seem to do that anymore. I have to consider the BW of priority queue as part of the percentage allocation i.e 32kbps is considered as 25% therefore I can only allocate my other classes for up to 75% only.

Is this a new "feature" or just happen to be a bug ? Can Cisco or someone confirm this please ?

This is my sample config.

map-class frame-relay 128K

no frame-relay adaptive-shaping becn

frame-relay cir 128000

frame-relay mincir 128000

service-policy output CoS-Out

policy-map CoS-Out

class Cat0-MCast

priority 8

class Cat0-VoIP

priority 24

class Cat1

bandwidth percent 30

random-detect

class Cat2

bandwidth percent 20

random-detect

class Cat3

bandwidth percent 10

random-detect

class Cat9

bandwidth percent 5

random-detect

class class-default

fair-queue

random-detect

1 Reply 1

jasyoung
Level 7
Level 7

If you want to make reservations for more than 75% of the capacity of an interface, use the "max-reserved-bandwidth" command on that interface. You can change the maximum up to 100% if you need to. This command has been around for quite a while.

It's difficult to say why 12.2 would have allowed you to go to 100%, perhaps there was a bug.

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