[PWE3] draft-ietf-pwe3-arch-04.txt

[Stewart Bryant <stbryant@cisco.com>]

I just rev'd the arch draft to correct an omission in section
5.4.4.

In draft-ietf-pwe3-arch-04.txt we now define the reserved bits
in the MPLS Payload Type Indentifier to be zero.

There are no other changes.

The revised section is shown below

Stewart

------------------------------------------------------------------------

5.4.4. MPLS Payload Identifier


   If technical considerations result in a PW control word that may
   alias an IP packet, the control word SHOULD be preceeded by an MPLS
   payload type identifier.

   The MPLS payload type is defined as follows:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |0 0 0 1|     reserved = 0      | PPP DLL Protocol Number       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           As defined by PPP DLL protocol definition           |
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       Figure 14: MPLS Payload Type Identifier

       PPP DLL Protocol Number [16:31]:
           These numbers are assigned by IANA.

   Bits 4 to 15 inclusive are reserved for future use and must be zero.

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