Re: OT:QOS understanding

You know what, I am reading through this again, and if you have a value of
0xA0 in the TOS field what you have is DSCP 40

0xA0 = 1010 0000
Now, DSCP is the first MSB so you have : 101000 = DSCP 40

Are your ACLs matching DSCP 40?

On Thu, Jun 16, 2011 at 4:34 PM, Dennis Worth <dennis.worth_at_gmail.com>wrote:

> Hi Group,
>
> I was working on an access-layer routed approach config, and trying to
> understand the marking of QOS TOS from the switchport level.
>
> I have an IP phone on a 3750X switch that then gets routed to a a core
> switch. What I am not seeing is a marking of the voice traffic from say
> vlan
> 20. I created an ACL on the routed interface at core switch to match IP
> PREC, DSCP values, but nothing seems to match. According to my config on
> the
> Voip phone it should be TOS = A0 or IP PPREC 5 or what I thought was EF.
>
> I am guessing that the TOS byte is just not being automatically mapped to
> DSCP, but not real sure.
>
> Thanks for any help guiding me through this.
>
> --
> Dennis Worth
>
> "Of all men's miseries the bitterest it this: to know so much and to have
> control over nothing."
> --Herodotus
>
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Joe Astorino
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"He not busy being born is busy dying" - Dylan
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