Re: [Diffserv-interest] Fw: RFC 3662 on A Lower Effort Per-Domain Behavior (PDB)

Roland Bless <bless@tm.uka.de> Sat, 20 December 2003 22:50 UTC

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Date: Sat, 20 Dec 2003 23:48:42 +0100
From: Roland Bless <bless@tm.uka.de>
To: "Jeff Norman" <jnorman@nortelnetworks.com>
Cc: diffserv interest <diffserv-interest@ietf.org>
Subject: Re: [Diffserv-interest] Fw: RFC 3662 on A Lower Effort Per-Domain Behavior (PDB)
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On Fri, 19 Dec 2003 19:04:31 -0500 (EST) "Jeff Norman" <jnorman@nortelnetworks.com>; wrote:

> Hmmm.... I would have thought that a single DSCP value may have
> been suggested for the LE PHB... perhaps a value of 000110 would

It's a _PDB_ definition actually, so the document describes which PHBs
could be used (cf. RFC 3086). It doesn't need to make any suggestion 
or recommendation for a DSCP value (which may be appropriate for a PHB 
definition).

> suffice, although it's not compatible with precedence bits (which would
> be CS0, although I think is better than CS1 which conflicts with AF1*).
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
No, that's not true: CS1 doesn't conflict with AF1x. 
You'll ask: Why not? (It has been said so many times before:) 
DSCPs have no structure, so CS1=001000 is not in AF1x={001010,001100,001110}
(you should never apply any bit mask to the DSCP, because all six bits
must be considered). RFC2474, sec 4.2.2.1:
   The DS field values of 'xxx000|xx', or DSCP = 'xxx000' and CU
   subfield unspecified, are reserved as a set of Class Selector
   Codepoints.


> Just my 2.3 cents,
> --Jeff

Just my clarification,
 Roland

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