[c-nsp] [Fwd: Re: QoS possible on the 7600 Sup720-3bxl?]

[The Father]

Chris,

Here's the text from a previous response I sent which has my configs.
Hope you can figure something out from them:

Thanks for the suggestion.  I did something similar to what you wrote
below and here's my config and subsequent error messages:

access-list 76 permit any
access-list 101 permit ip any 192.168.41.0 0.0.0.255
!
class-map match-any all-traffic
description Match all traffic
match access-group 76
!
class-map match-any ACL101
description Match priority block
match access-group 101
!
policy-map test-voice-lan
class ACL101
  set mpls experimental imposition 5
   priority percent 33
class all-traffic
  set mpls experimental imposition 1
   bandwidth percent 66

Trying to apply the policy-map outbound resulted in this error:

7609-lab(config-if)#service-policy output test-voice-lan
%Priority command with parameter not supported on GE-WAN4/1. Please
configure police along with priority to limit the amount of traffic on
priority class
7609-lab(config-if)#

I tried making the config changes as suggested in the error message and
then I got this:

7609-lab(config)#int ge-4/1
7609-lab-hcap(config-if)#service-policy output test-voice-lan
%PRIORITY command with "match access-group" class not supported on
GE-WAN4/1
7609-lab(config-if)#

So I decided to change both queues to CBWFQ and this is what I got:

7609-lab(config)#int ge-4/1
7609-lab(config-if)#service-policy output test-voice-lan
%Weighted Fair Queuing with "match access-group" class not supported on
GE-WAN4/1
7609-lab(config-if)#

It looks like the router doesn't like matching on ACLs for this
particular setup.



Jose



Bisazza, Chris wrote:
> Note that the 7600 is different to standard routers where QoS is
> concerned (it's PFC QoS).
>
> 1. You cannot schedule output based on MPLS e-tags, you can only use the
> 'match mpls experimental' option to apply it to something else. (COS
> comes to mind). Note that setting the priority of a packet will (by
> default) re-write the DSCP values of your packet to match that value
> (unless you configure it otherwise). 
>
> Personally I think it's safer to match the packets you want to modify
> using an ACL (or similar) and set the DSCP values for those packets.
>
>   
>
> 2. 
>   
>> I've recently found out that the 7609 can only match on packet values 
>> that exist before it enters the router.
>>     
>
> not 100% true. Traffic will generally only pass through the PFC once,
> however, which means that you can only do one PFC operation. Setting the
> MPLS e-tag is one such operation. QoS is also applied (separately) on
> output. The PFC operation is different to the queueing function.
>
> Note that the policy-maps (or samples of them) would be useful in
> determining what you're trying to do.
>
> Chris.
>
>
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