OT:QOS understanding

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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