[c-nsp] Cisco ASR 1002-X PPPoE Subscriber QoS policies

[Brian Turnbow]

Hi,

> 
> Hi folks,
> 
> I have to setup a QoS policy to maximise the limited bandwidth on the
cross
> connects to our broadband backhaul provider.
> 
> To date I have used per session policies but I am not sure that this
will account
> for the scenario where all subscriber sessions request more bandwidth
that the
> cross-connect is provisioned for.  So I need to ensure that in this
given scenario
> that the business critical application/service for each session are
guaranteed a
> min. amount of bandwidth while dropping all other non-essential traffic.
> 
> I have read that without BRR the allocation of remaining bandwidth may
not be
> equally apportioned, but before that I need to ensure that the business
critical
> app gets it .min bandwidth.  That said is it a case of using a priority
queue to
> provide the necessary guarantee in the above scenario?

Why not do something like this

Create a shaper for all traffic  


interface GigabitEthernet1/0/0.10   
       encapsulation dot1Q 10
       pppoe enable group PPPOEGROUP
       no snmp trap link-status
      service-policy output SVLAN_50M
 
policy-map SVLAN_50M
  class class-default
    shape average 50000000      

and then your subscriber policy parent/child that you assign to the
sessions from radius setting the priority bandwidth

policy-map class Priority-child
  priority level 1
  police cir 128000 bc 6000 pir 256000 conform-action transmit
exceed-action drop  violate-action drop
class class-default
!
policy-map CVLAN_1M -parent                              
  class class-default
    bandwidth remaining ratio 1                  
        shape average 1000000                           
    service policy Priority-child


The ASR will provide the priority bandwidth before  dividing the remaining
bandwidth equally between the sessions.



HTH

Brian


> 
> I have some reading to do, but would be grateful for any advice /
input...
> 
> Many thanks advance..
> Neil
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