Re: [mpls] Open DT agenda for 2021-09-09

[John E Drake <[e-mail]>]

Loa,

Regarding your "Thoughts on Encapsulating ancillary data", I think we need to define for a given forwarding action whether it requires ancillary data.  I agree with Kireeti that any ancillary data required by forwarding actions should be encoded in the MPLS label stack.  So, what we should have is an LSE containing the forwarding actions followed by LSEs for each forwarding action that requires ancillary data.  These LSEs should be in the same order in which the forwarding actions are defined;  if forwarding actions 1, 3, and 5 require ancillary data, then following the LSE containing the forwarding actions there should be three LSEs, for forwarding actions 1, 3, and 5.

I also think we need to specify that a transit node should only process the forwarding actions it understands and ignore the others, and that when constructing the FAI LSEs the ingress node should only include forwarding actions understood both by it and by the egress node.  I think the implication of these rules is that a every node needs to understand every bit in the forwarding actions up to a given bit position.  I.e., it can't selectively support individual forwarding actions.   

Yours Irrespectively,

John


Juniper Business Use Only

> -----Original Message-----
> From: mpls <[e-mail]> On Behalf Of Loa Andersson
> Sent: Tuesday, September 7, 2021 4:46 AM
> To: [e-mail]
> Cc: [e-mail]; [e-mail]; DetNet Chairs <detnet-
> [e-mail]>
> Subject: [mpls] Open DT agenda for 2021-09-09
> 
> [External Email. Be cautious of content]
> 
> 
> MPLS Open DT,
> 
> We will have our meeting as usual meeting on Thursday (CEST 5pm).
> 
> Please find the agenda a:
> 
> https://urldefense.com/v3/__https://trac.ietf.org/trac/mpls/wiki/2021-09-09-
> agenda__;!!NEt6yMaO-gk!WANhHodAhWZuqCjTWdq1kjMWURaq8utN7dc--
> 65c9lu71w2JUVib03Ng1RrdKKk$
> 
> For the text on "Thoughts on Encapsulating ancillary data" I have received some
> comments, both off-line and on-line. I have added some responses at the end of
> the text.
> 
> /Loa
> --
> 
> Loa Andersson                        email: [e-mail]
> Senior MPLS Expert                          [e-mail]
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