Re: [mpls] mail on ISD encodding

[[e-mail]]

Tony,

Inline plz!

>
> Hi Loa,
>
>
>>>>> [WG chair hat: off]
>>>>>
>>>>> Note that we have a few spare bits in format B.  We COULD in
>>>>> principle,
>>>>> change the current proposal to allow format D to follow format B. For
>>>>> example, we could change format B to look 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
>>>>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>> |   Opcode    |        Data             |U|IHS|S|  NASL |  NAL  |
>>>>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>
>>>>
>>>> What is U, is it what once was called P?
>>>
>>>
>>> Please see the draft.  U is the unknown action handling option.  I have
>>> no
>>> recollection of what P is or was.
>>
>> Plz look at draft-jags-mpls-ps-mna-hdr (you are a co-author) in
>> section 4. It allocates the reserved bit in the Format B LSE, as
>> a bit indicating post-stack data.
>
>
> You were expecting us to follow a context switch to an entirely different
> document?


hmmmm, yes!
>
> Yes, I’m proposing moving the U bit to where that draft places the P
> bit.  If we want to keep the P bit there, then perhaps we shuffle other
> bits around or remove one bit of data.

I'm not very concerned about where we put p-bit, as long as it is in a
Format B LSE.

We need an easy hook to hand PSD on!

/Loa
>
> T
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>