[cisco-voip] [OSL | CCIE_Voice] DSCP to COS map question

[Jonathan Charles]

Well, my question is do we need to modify it... we used to...


J

On Sun, May 10, 2009 at 8:24 AM, Wes Sisk <wsisk at cisco.com> wrote:
> Is it caused by change in recommended DSCP values over time.  ~4 years ago
> we changed recommended values for signaling at least.
>
> /Wes
>
> On Sunday, May 10, 2009 2:53:26 AM, Jonathan Charles <jonvoip at gmail.com>
> wrote:
>
> Apologies for the lack of clarification...
>
> The switch is a 3750-24PS
>
> The lab is v3.
>
> And yes, I know to trust CoS on trunks and DSCP on access ports to
> servers...
>
>
>
> Jonathan
>
> On Sat, May 9, 2009 at 9:37 PM, Michael Ciarfello
> <MCiarfello at iplogic.com> wrote:
>
>
> I'm a little confused what you are asking exactly.  And I think you have the
> mappings backwards from what your premise statement is.
>
> Depending on switch  / router model or software the COS to DSCP map may
> configure 24 or 26.  If the requirement is to put signaling traffic in CS3,
> then use 24.  Maybe the requirement would be to put it in AF31 so use 26.
>
> Also study up on trust cos vs trust dscp and where to use each and on what
> piece of equipment, etc.  Some 6500 line cards have all sorts of
> restrctions.  QoS SRND has a great discussion of these.
>
> If you have a home lab a sniffer is a great tool to check out the markings
> at various places and make sure they are carrying through.
>
> ah crap, power is flickering, gotta go.
>
> ________________________________________
> From: ccie_voice-bounces at onlinestudylist.com
> [ccie_voice-bounces at onlinestudylist.com] On Behalf Of Jonathan Charles
> [jonvoip at gmail.com]
> Sent: Saturday, May 09, 2009 5:43 PM
> To: cisco-voip at puck.nether.net; ccie_voice at onlinestudylist.com
> Subject: [OSL | CCIE_Voice] DSCP to COS map question
>
> So, autoQoS adds this:
>
> mls qos map cos-dscp 0 8 16 24 32 46 48 56
>
> Yet we are advised to do this:
>
> mls qos map cos-dscp 0 8 16 26 34 46 48 56
>
> Remapping AF31 to COS 3
>
> Well the default puts CS3 into COS 3, which is what you want to do now...
>
> Am I right?
>
>
> Jonathan
>
>
>
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