From: Donny MATEO (donny.mateo@sg.ca-indosuez.com)
Date: Sat Nov 15 2003 - 13:42:54 GMT-3
Just came across something interesting, I seems to remember something from
those days reading DocCD over and over again
"The recommended DSCP value for EF PHB is 101110", this is take from
"Implementing Diffserv for End-to-End Quality of Service Overview", those
interested can look it up in the following
URL:http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/fqcprt7/qcfdfsrv.htm
Anyway...if my math is correct 101110 is 46 in decimal world.
Donny
----- Forwarded by Donny MATEO/ADPC/ASIA/BANQUE_INDOSUEZ/FR on 11/16/2003
12:38 AM -----
"Donny MATEO" <donny.mateo@sg.ca-indosuez.com>
Sent by: nobody@groupstudy.com
11/16/2003 12:34 AM
Please respond to "Donny MATEO"
To: "Michael Snyder" <msnyder@wk.net>
cc: ccielab@groupstudy.com, nobody@groupstudy.com, (bcc: Donny
MATEO/ADPC/ASIA/BANQUE_INDOSUEZ/FR)
Subject: Re: Does Precedence 5 always equal DCSP CS5?
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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