Re: [mpls] What percentage will carry indicator/ancillary data in the future

[Kireeti Kompella <[e-mail]>]

Hi Loa,

The term ancillary data is ambiguous: as I understand, it refers to both ISD and PSD.

Two points:
1. High value traffic will frequently use FAI/ISD/PSD.  Best effort traffic probably will probably do so less often.
2. As we find more use cases for FAI, the percentages for both will go up.

For example, mandating CW for L2 PWs (as has been done, and may be reinforced) will mean more post-stack headers.

The way I understand your question is: how often is the PSD looked at (since it potentially creates lots of work for the forwarding engine).  We should consider the answer to be: very often (for high-value traffic), and make sure we handle this case well.  Even if the average number is small (lots of best effort traffic with no PSD), it wouldn’t serve the community well to only drop a few packets, but all of them high-value :)

:k

> On Oct 9, 2021, at 10:43, Loa Andersson <[e-mail]> wrote:
> 
> Design Team,
> 
> I have one thing that I been thinking about.
> 
> If we consider future mpls encapsulated packet, what percentage will carry indicators and ancillary data?
> 
> /Loa
> -- 
> 
> Loa Andersson                        email: [e-mail]
> Senior MPLS Expert                          [e-mail]
> Bronze Dragon Consulting             phone: [phone]
> 
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