QoS default class with a bandwidth statement or not?

Unanswered Question
Apr 30th, 2012

I'm putting together a 5-class QoS config for prioritizing Telepresence and VoIP to be configured on gig-ethernet interfaces in an ASR1001 WAN router.  My question has to do with whether or not to use a bandwidth statement in the class class-default.  From what I understand, class-default will use what ever bandwidth is remaining after the other classes.  Is that correct?

The classes in the QoS config are as follows with two version of class-default:

Voice = 50mb

Telepresence = 50mb

Signaling = 5mb

Network control = 5mb

Class-default = remaining (or 800mb)

1. - without bandwidth statement in class-default

policy-map DataCenter_and_Triangle_Gigabit_5class

   class Voice_Avaya

       priority 50000

   class Telepresence

       priority 50000

   class Signaling

       bandwidth 5000

   class Network

       bandwidth 1000

   class class-default

       fair-queue

          random-detect

2. - with bandwidth statement in class-default

policy-map DataCenter_and_Triangle_Gigabit_5class

   class Voice_Avay

      priority 50000

   class Telepresence

      priority 50000

   class Signaling

      bandwidth 5000

   class Network

      bandwidth 1000

   class class-default

      bandwidth 800000

      fair-queue

      random-detect

What would be the better way to configure class-default?

I have this problem too.
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rizwanr74 Mon, 04/30/2012 - 08:08

"From what I understand, class-default will use what ever bandwidth is remaining after the other classes.  Is that correct?"

Answer is yes.

"What would be the better way to configure class-default?

Please follow as shown below.

class class-default

   bandwidth remaining

     random-detect

FYI...

priority queue has strict policing.

Hope this answers your questions.

thanks

Rizwan Rafeek

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Posted April 30, 2012 at 7:13 AM
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