Re: Ip Precedence or DSCP

From: Godswill Oletu (oletu@inbox.lv)
Date: Fri Jul 07 2006 - 10:24:52 ART

Lewis,

If one have to work within the limits of the question, my understanding is CAR have to be used. Agreed, CAR can not be used to prioritize traffic on this router, but one can use it to mark a traffic with a higher precedence/DSCP value on this router and the next or subsequent routers can act on those markings to prioritze the traffic.

If a task mentioned that one should use CAR, the last thing that I will be thinking about is priority queuing. As you said, the CCIE lab is not a best practice lab. It is important that questions like these be clearified with the proctor.

Godswill Oletu
CCIE #16464

  ----- Original Message -----
  From: Chris Lewis
  To: Godswill Oletu
  Cc: Aamir Aziz ; ccielab@groupstudy.com
  Sent: Friday, July 07, 2006 8:48 AM
  Subject: Re: Ip Precedence or DSCP

  I would read this a little differently.

  First I don't see what CAR has to do with giving max priority. Second, if no marking value is supplied, I'd look for a way to do this without a marking requirement. One can use legacy priority queueing and assign all TCP traffic to the highest priority queue.

  http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/fqcprt2/qcfpq.htm

  This is probably not the way you'd want to do things in the real world these days, but then again that's not relevant to CCIE questions :)

  Chris

   
  On 7/7/06, Godswill Oletu <oletu@inbox.lv> wrote:
    Aamir,

    If there is no restriction or leading toward a particular solution, then any
    of them should be fine. Rememeber that ip precedence over laps with the
    DSCP.

    So something like:

    ..... conform-action set-dscp-transmit 46 exceed-action set-dscp-transmit 46

    OR

    ..... conform-action set-prec-transmit 5 exceed-action set-prec-transmit 5

    Are good candidates, when in doubt do ask the proctor and do not forget to
    enable or confirm that 'ip cef' is enabled.

    HTH.

    Godswill Oletu
    CCIE #16464

    ----- Original Message -----
    From: "Aamir Aziz" <aamiraz77@gmail.com >
    To: <ccielab@groupstudy.com>
    Sent: Friday, July 07, 2006 5:41 AM
    Subject: Ip Precedence or DSCP

> Hello ppl,
>
> I have a small question. If there is a CAR question which says Prioritize
> tcp traffic with MAX PRIORITY so are we going to use Ip Precedence or
    DSCP?
> and what values?
>
> Thanks
> Aamir
>
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