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Encoding of MPLS label in MP-REACH-NLRI question

  • From: Yakov Rekhter <yakov@juniper.net>
  • Date: Fri, 05 Jan 2001 13:12:05 -0800
  • cc: "Rijsman, Bruno" <BRijsman@unispherenetworks.com>, "'mpls@UU.NET'" <mpls@UU.NET>, "BGP exploder (E-mail)" <bgp@ans.net>

Eric,

> Right now the draft says:
> 
>         The Label  field carries one or more  labels (that corresponds
>         to the  stack of labels [MPLS-ENCAPS]). Each  label is encoded
>         as  3 octets,  where the  high-order bit  contains  "Bottom of
>         Stack" (as defined in [MPLS-ENCAPS]). The following high-order
>         three bits  must be  zero. The remaining  20 bits  contain the
>         label value.
> 
> Barring objection, I will change this to:
> 
>         The Label  field carries one or more  labels (that corresponds
>         to the  stack of labels [MPLS-ENCAPS]). Each  label is encoded
>         as 3  octets, where the  high-order 20 bits contain  the label
>         value,  the following  three bits  must be  zero, and  the low
>         order  bit   contains  "Bottom   of  Stack"  (as   defined  in
>         [MPLS-ENCAPS]).
> 
> and reissue the draft.

I also wonder whether we need "the following three bits must be zero"...

Yakov.
>