[c-nsp] QoS for videoconferencing

[Oliver Boehmer (oboehmer)]

Vincent De Keyzer <> wrote on Thursday, February 08, 2007 11:54 AM:


> I need to set up QoS for a Internet access customer who wants to make
> sure that his VC system gets, no matter what, 512kbps out of his
> total 3 Mbps. 
>
> I would like somebody to validate my config because I am not too
> familiar with those things.
>
> Here is my proposed config (customer has IP range x.y.z.224/28, VC
> system will be .230):

> access-list 100 permit ip any host x.y.z.230
> access-list 199 deny   ip any host x.y.z.230
> access-list 199 permit ip any x.y.z.224 0.0.0.7
!
> class-map match-all AAUR02i-VideoConferencing
>  match access-group 100
> class-map match-all AAUR02i-Other
>  match access-group 199
> 
> !
> 
> policy-map AAUR02i
>  class AAUR02i-VideoConferencing
>   bandwidth 512
>  class AAUR02i-Other
>   bandwidth 2560

you can simplify this by

policy-map AAUR02i
 class AAUR02i-VideoConferencing
   bandwidth 512
 class class-default
  ...

you can apply RED or something else to class-default, no need to reserve
the remaining bandwidth there.. 
you can also evaluate to use LLQ ("priority"), but regular CBWFQ should
also work..


> int ATM 2/0.159 
>  service-policy output AAUR02i

did you configure any vbr/abr on this PVC? I think we need this to
properly create backpressure..

See http://www.cisco.com/warp/public/121/where_policy.html and related
links.

	oli