Configuring QoS on ATM Sub-Interfaces

Unanswered Question
Sep 13th, 2007
User Badges:


I have a policy map defined on a 3845 router running c3845-advipservicesk9-mz.124-3b.bin.

Iam trying to configure the service policy under the PVC, but it does not reflect in the running config.

PLease find the ATM PVC config below.

interface ATM1/0.130 point-to-point

ip x.x.x.x

ip access-group sqlfix out

ip wccp web-cache redirect out

ip wccp 80 redirect out

ip wccp 81 redirect out

ip wccp 82 redirect out

ip wccp 83 redirect out

ip pim sparse-dense-mode

ip multicast boundary multicast_boundary_medbw

ip multicast rate-limit out 1024

ip mrm test-receiver

ip summary-address eigrp 100 x.x.x.x

pvc abcd 2/130

vbr-nrt 1920 1920 1

max-reserved-bandwidth 100

Appreciate your help.



  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Joseph W. Doherty Thu, 09/13/2007 - 05:15
User Badges:
  • Super Bronze, 10000 points or more

Does you policy use absolute bandwidth values? Does the policy's total bandwidth exceed the interface's bandwidth? If so, I've seen IOS quietly drop the policy at the command line. (Belive it syslogs it, though.)

If your are using absolute bandwidth values in your policy, trying using percentage based bandwidth values.

navneet_78 Fri, 09/14/2007 - 02:32
User Badges:

Thanks for your Reply Joseph!!

I have shaping parameter defined under my class maps. Does that create an issue?

class video-bearer

bandwidth percent 1

shape average percent 1

class medium-priority

bandwidth percent 40

shape average percent 40



Joseph W. Doherty Fri, 09/14/2007 - 03:49
User Badges:
  • Super Bronze, 10000 points or more

Shapers throttle traffic; setting a maximum bandwidth allowance. The bandwidth statement sets a minimum allowance, except for LLQ where it also is a rate limiter. If this is what you intend, shouldn't be an issue.


Normally, you allow classes to use excess bandwidth.


This Discussion