[mpls] Consensus poll on Design directive for the MPLS Open DT

[Loa Andersson <[e-mail]>]

Working Group, Design Tean,

The Open DT has discussed the relationship between GAL/G-ACh and the new 
methods for indicating and transporting ancillary data in and after the 
label stack.

We have decided to give the MPLS Open DT the following design directive:

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Following the discussion in the MPLS Open DT 2021-08-19 we have have 
decided to give the MPLS Indicator and Open Design team this design 
directive.

RFC 5586 "MPLS Generic Associated Channel" (including the updates by RFC 
7274, RFC 6423, RFC 7214, and RFC 7026) will not be changed by the MPLS 
Open Design Team. The associated channel (GAL/G-ACh) will continue to 
operate as specified. No changes should be made to the associated 
channel, without careful coordination with what will be specified by the 
MPLS Pen design team.

The Open design team will continue define methods bases on indicators 
(e.g. FAI-style SPL) and ancillary data.

A packet can not carry both the associated channel and the new methods 
for transporting ancillary data indicated by the FAI-style SPL, i.e. the 
GAL and the FAI-style SPL can not both be present in a label stack. The 
reason is that the way the ACH is specified there is a high risk of 
collision of "data after the BoS" specified by other methods.

---------------------end --------------------------------------------

The design team will start working according to this design directive, 
but for a period of two weeks we will comments on the directive.

Please send comments to the MPLS wg mailing list ([e-mail])

/Loa

for the co-chairs
-- 

Loa Andersson                        email: [e-mail]
Senior MPLS Expert                          [e-mail]
Bronze Dragon Consulting             phone: [phone]