Re: [mpls] draft-decraene-mpls-slid-encoded-entropy-label-id (was RE: Please review the PALS/MPLS/DetNet Joint Session minutes)

Tony

> From: Tony Li <[email protected]> On Behalf Of Tony Li
> 
> 
> Bruno,
> 
> 
> However, this is not a guarantee. Any design that attempts to reuse this TTL field
> does run a non-zero risk of being impacted by designs that do check and reject
> such entries.
> [Bruno] RFC 6790 also says that on the Egress LSR “The EL's TTL MUST be
> ignored.”
> https://datatracker.ietf.org/doc/html/rfc6790#section-4.1
> 
> 
> Thank you, that’s a good point.
Thank you for acknowledging.

>  However, that’s still not a guarantee (i.e. 100%
> mathematical certainty). There is still risk involved. Small, but non-zero.

Indeed. Exactly like any other reserved field that an IETF WG had defined and then use to extend the protocol.
In the WGs that I'm following (mostly routing), I don't recall that extending (actually even defining) a reserved field had raised that amount of discussion about this mathematically non-zero probability. Discussions -if any- are mostly whether we should say MUST/MUST, SHOULD/SHOULD, MUST/SHOULD or SHOULD/MUST for the sender and receiver behaviors. And even with SHOULD, I don't recall that anyone express that non-zero probability.

Plus obviously, non-zero probability is everywhere. Including in much more live critical aspects. E.g. landing is mandatory 😉. And we all live with that. (or die occasionally)

--Bruno
 
> T


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