[Diffserv-interest] [OFFLIST] MPLS+Diffserv(mapping DSCP to EXP)

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Aaron

Begin forwarded message:

> From: nerdboy <nerdboy@rediffmail.com>
> Date: Tue Feb 4, 2003  1:20:01  AM America/Indianapolis
> To: Diffserv@ietf.org
> Subject: [Diffserv] [OFFLIST] MPLS+Diffserv(mapping DSCP to EXP)
> Reply-To: nerdboy@rediffmail.com
>
> 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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