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New Member

QoS on ATM - Avaliable bandwidth confusion

I have an ATM sub interface

interface ATM0/0.xxx point-to-point

bandwidth 512

ip address x.x.x.x x.x.x.x

ip accounting output-packets

pvc ########## 1/0

protocol ip x.x.x.x

vbr-nrt 500 500

encapsulation aal5mux ip

service-policy output ##########

the vbr-nrt is set as 500 my understanding that avaliable bandwidth is 75 % of 500 less any reserverd bandwidth on the service policy, however

show queueing int ATM0/0.xxx

returns

Interface ATM0/0.xxx VC 1/0

Queueing strategy: weighted fair

Output queue: 0/512/64/121 (size/max total/threshold/drops)

Conversations 0/19/32 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 2500 kilobits/sec

Why is the avaliable bandwidth 5 x the real bandwidth???

3 REPLIES
Purple

Re: QoS on ATM - Avaliable bandwidth confusion

That seems like a bug. You are correct in that the available bandwidth should be:

0.75*500 - sum(bandwidth reservations)

What platform/IOS is this on ?

Paresh

New Member

Re: QoS on ATM - Avaliable bandwidth confusion

3725 with

Cisco Internetwork Operating System Software

IOS (tm) 3700 Software (C3725-SPSERVICESK9-M), Version 12.3(3a), RELEASE SOFTWAR

E (fc2)

Copyright (c) 1986-2003 by cisco Systems, Inc.

Compiled Wed 15-Oct-03 01:31 by dchih

Purple

Re: QoS on ATM - Avaliable bandwidth confusion

Unfortunately, I don't have a 3745 I can try this on at the moment... but it definitely seems like a bug. You might want to open up a TAC case if this is causing issues for you.

Paresh

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