Re: [Diffserv] [OFFLIST] MPLS+Diffserv(mapping DSCP to EXP)

Mark Duffy <mduffy@quarrytech.com> Tue, 04 February 2003 12:38 UTC

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Date: Tue, 04 Feb 2003 07:29:20 -0500
To: nerdboy@rediffmail.com, Diffserv@ietf.org
From: Mark Duffy <mduffy@quarrytech.com>
Subject: Re: [Diffserv] [OFFLIST] MPLS+Diffserv(mapping DSCP to EXP)
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Have a look at <http://www.ietf.cnri.reston.va.us/rfc/rfc3270.txt>

At 11:50 AM 2/4/2003 +0530, nerdboy wrote:
>Hi,
>
>i know this is offtopic but i didnt know where else to ask.
>
>i understand that the EXP bits in MPLS are used to provide DSCP
>functionality(Diffserv) for EXp inferred LSP's in MPLS.
>
>1. i want to know how the DSCP bits are mapped to the EXP bits ?
>
>2. Further, since the DSCP  ( pow(2,8) = 256 combinations ) is 8 bits and
>provides 22 different PHB's(or roughly 7 different classes),
>      and the EXP is just 3 bits and therefore can provide only upto 8
>different classes, wouldnt there be loss of info while mapping DSCP->EXP ?
>
>any help would be greatly appreciated.
>
>Warm Regards
>nerd
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