ADSL QOS service policy

[scotlandvisit]

My ISP has said they will set up their side to give 50% policed real time traffic and 30% for our application traffic burstable then 5% anything else burstable.  The QOS below is my attempt to do this but I was advised that to apply it to the Dialer 1 interface I hade to create a second policy-map (ADSLOut) which had the class-default and the child policy (QOSADSL) within that.

When I did this I can't apply it to the Dialer 1 interface but if I use the child policy then it will allow me to apply that, will this work the same way.

class-map match-all RealTime
 match ip dscp ef
class-map match-all General
 match any
class-map match-any Application
 match ip dscp cs3
 match ip dscp af41
!
policy-map QOSADSL
 class RealTime
  bandwidth percent 50
 class Application
  priority percent 30
 class General
  priority percent 5
 class class-default
  shape peak percent 85
policy-map ADSLOut
 class class-default
   service-policy QOSADSL

!

!

interface Dialer1

<Snipped>

 bandwidth 1240
 ip nbar protocol-discovery
 ip flow ingress
 ip flow egress
 load-interval 30
 tx-ring-limit 3
 tx-queue-limit 3
 service-policy output QOSADSL

or

service-policy output ADSLOut

[Martin Moran]

Hi @scotlandvisit,

My first opinion is a recomendation: in the policy-map, when you're configuring LLQ use the priority command for delay-sensitive traffic (Voice) and the bandwidth command for the rest. This is because the priority command is used to indentify a class as a "strict priority class" which in my opinion should be the voice traffic and the bandwidth command is used to allocate bandwidth to nonpriority classes.

The interface is not letting you apply the service-policy because you have to configure shaping inside the class-default of the parent policy-map. This shape is going to be the value in bps that you want to assing to the traffic classes that you've configured. For example, let's say that you want to allocate 1Mbps for all the classes.

-

policy-map QOSADSL
 class RealTime
  priority percent 50

 class Application
  bandwidth percent 30

 class General
  bandwidth percent 5

 class class-default
  shape peak percent 85

policy-map ADSLOut
 class class-default
  shape average 1000000
  service-policy QOSADSL

!

interface Dialer1
 service-policy output ADSLOut

-

Try this configuration and let me know.

HTH.

Rgrds,

Martin, IT Specialist

[Reuben Farrelly]

What version of IOS and what platform are you trying this one?  There are some recent enhancements to properly support this sort of configuration on Dialer interfaces that may be of interest to you.

You may have better luck applying this to an ATM PVC than a dialer interface of you are running older code.