[mpls] Qyestion on draft-ietf-mpls-mna-hdr

All,

Sorry, resending - I forgot to add a subject.

/Loa

> Working Group, Authors.
>
> I have a question on draft-ietf-mpls-mna-hdr@ietf.org, in section 13.3 the
> document says>
>
>    There are at most 15 Format D LSEs
>    per opcode, so there are at most 20 + 15 * 30 = 470 bit positions.
>    The Bit Position is an integer with value 0-469.
>
> The encoding looks like:
>
>     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
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>    |      MNA-Label=bSPL (TBA)             | TC  |S|    TTL        | A
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>    |   Opcode    |        Data             |R|IHS|S| Res |U|  NASL | B
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>    |   Opcode    |             Data              |S|  Data |  NAL  | C
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>    ~1|                   Data                    |S|     Data      ~ D
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> The NASL and NAS are defined as.
>
>    *  NASL (4 bits) : The Network Action Sub-Stack Length (NASL).  The
>       number of additional LSEs in the sub-stack, not including the
>       leading Format A LSE and the Format B LSE.
>
>    *  NAL (4 bits): Network Action Length.  The number of LSEs of
>       additional data, encoded in LSE Format D (Section 4.4) following
>       this LSE.
>
> The highest value you can have in the NASL is 15, and that would include
> the Format C LSE, how can there be 15 Format D LSEs, if NAL is =15, the
> last Format D LSE would "stick beyond" the length of the NAS, right?
> Isn't the maximum number of Format D LSE 14?
>
>
> /Loa
>
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