Re: [mpls] Open DT - thoughts for dicussion

[Loa Andersson <[e-mail]>]

Greg,

Thanks for reading and and commenting.

Inline please.

On 2021-12-12 09:12, Greg Mirsky wrote:
> Hi Loa,
> thank you for putting it all together. Now it is all so much clearer (to 
> me at least).
> I've got several questions and much appreciate your thoughts, 
> clarifications:
> 
>   * it appears that the first bSPL will always be used for i-indicators
>     even when all are cleared. If we accept the proposal to separate i-
>     and p-indicator spaces, perhaps the format might be like 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
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> | Base Special Purpose Label  (TBD)     |t a a|S|a a a a a a a x|
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> 
> 
>                      Label:  Label Value, 20 bits
>                      a:      Ancillary Data Indicator (ADI)
>                      x:      extension bit
>                      t:      ADI type: 0 - ISD, 1 - PSD
>                      S:      Bottom of Stack, 1 bit
> 
>   * I imagine that indicators will be assigned to particular functions
>     and, at some point, 10th, then 19th, and probably more indicator
>     will be allocated. With the current encoding schema to set 10th
>     indicator will require two LSEs, 19th - three. Seems a bit
>     expensive. Do you think there's a benefit to look how to compress
>     the zeroes that fill the indicator space of the whole bSPL?
> 
This is precisely why I put the text together.

I'm perfectly willing to discuss "how to compress". as a matter of fact 
I thought a bit about it, but the ideas I had was too complicated. If 
anyone has ideas please bring them to the list.

/Loa
> 
> Regards,
> Greg
> 
> On Fri, Dec 10, 2021 at 6:09 AM Loa Andersson <[e-mail] 
> <mailto:[e-mail]>> wrote:
> 
>     Folk,
> 
>     I had a long flight yesterday and had to do something.
> 
>     https://trac.ietf.org/trac/mpls/wiki/ADI-fields
>     <https://trac.ietf.org/trac/mpls/wiki/ADI-fields>
> 
>     /Loa
>     -- 
>     Loa Andersson                        email: [e-mail] <mailto:[e-mail]>
>     Senior MPLS Expert [e-mail] <mailto:[e-mail]>
>     Bronze Dragon Consulting             phone: [phone]
> 
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-- 
Loa Andersson                        email: [e-mail]
Senior MPLS Expert                          [e-mail]
Bronze Dragon Consulting             phone: [phone]