From: Donny MATEO (donny.mateo@sg.ca-indosuez.com)
Date: Sat Nov 15 2003 - 13:34:25 GMT-3
I seem to remember that DSCP is has another 3 bits addition to the ip
precedence bits.
Those 3 bits are the factor determining the drop preference....(actually
only 2 is used if I recall correctly). So yeah precedence 5 (EF), but what
kind of drop characteristic ?...... I'm not sure if the implementation on
IOS QOS coding actually take heed of those extra bits in DSCP, but who
knows.
Donny
"Michael Snyder" <msnyder@wk.net>
Sent by: nobody@groupstudy.com
11/16/2003 12:19 AM
Please respond to "Michael Snyder"
To: <ccielab@groupstudy.com>
cc: (bcc: Donny MATEO/ADPC/ASIA/BANQUE_INDOSUEZ/FR)
Subject: Does Precedence 5 always equal DCSP CS5?
I've been reading the new Cisco Press DQOS book. I highly recommend it.
It's basically a tutorial on each of cisco's queuing tools.
Anyway, it directly links Precedence and DCSP because of the overlapping
bit fields used in the packet.
Taking this concept a bit farer; my question is can you use DCSP CS5
and Precedence 5 interchangeably?
I can envision a lab question stating all voice traffic (via dial peer)
in the network should be marked with a DCSP value of 40.
Could you image the possible time wasted trying to mark the voice
traffic via dcsp, when a simple precedence command could do it.
Thanks for Your Time,
Michael
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