Re: [mpls] FW: New Version Notification for draft-jags-mpls-ps-mna-hdr-00.txt

All,

I have a question that is not new, and I’m still uncertain what the correct answer is. 

I’m not certain that we should consider “the first nibble” as part of the MNA PSD. Admittedly it is part of PSD, but not part of the MNA PSD. 

We could say that MNA PSD start after the first nibble. If the PSD-bit is set in the MNA-label LSE, we can safely ignore the first nibble, if it is not set we need to look at the first nibble, and the data following the first nibble is not MNA ancillary data. 

I see no meed to define a PSD first nibble. It would also avoid a potential ambiguity in using the Generic Associated Channel nibble. 

For MNA the first should be set to 0000b when sent, and ignored when received. 

/Loa

Sent from my iPhone

> On 10 Mar 2023, at 13:59, Jaganbabu Rajamanickam (jrajaman) <[email protected]> wrote:
> 
> 
> Hello Everyone,
>  
>    We like to introduce our new draft on Post-Stack MNA solution.
>    Welcome your review comments and suggestions.
>  
> Thanx,
> Jags
>  
> From: [email protected] <[email protected]>
> Date: Friday, March 10, 2023 at 7:52 AM
> To: Jaganbabu Rajamanickam (jrajaman) <[email protected]>, Jie Dong <[email protected]>, Rakesh Gandhi (rgandhi) <[email protected]>, Royi Zigler <[email protected]>, Tony Li <[email protected]>
> Subject: New Version Notification for draft-jags-mpls-ps-mna-hdr-00.txt
> 
> 
> A new version of I-D, draft-jags-mpls-ps-mna-hdr-00.txt
> has been successfully submitted by Jaganbabu Rajamanickam and posted to the
> IETF repository.
> 
> Name:           draft-jags-mpls-ps-mna-hdr
> Revision:       00
> Title:          Post-Stack MPLS Network Action (MNA) Solution
> Document date:  2023-03-10
> Group:          Individual Submission
> Pages:          17
> URL:            https://www.ietf.org/archive/id/draft-jags-mpls-ps-mna-hdr-00.txt
> Status:         https://datatracker.ietf.org/doc/draft-jags-mpls-ps-mna-hdr/
> Html:           https://www.ietf.org/archive/id/draft-jags-mpls-ps-mna-hdr-00.html
> Htmlized:       https://datatracker.ietf.org/doc/html/draft-jags-mpls-ps-mna-hdr
> 
> 
> Abstract:
>    This document defines the Post-Stack MPLS Network Action (MNA)
>    solution for carrying Network Actions and Ancillary Data after the
>    MPLS label stack based on In-Stack MNA solution defined in draft-
>    ietf-mpls-mna-hdr.  MPLS Network Actions can be used to influence
>    packet forwarding decisions, carry additional OAM information in the
>    MPLS packet or perform user-defined operations.  This document
>    addresses the MNA requirements specified in draft-ietf-mpls-mna-
>    requirements.  This document follows the MNA framework specified in
>    draft-ietf-mpls-mna-fwk.
> 
>                                                                                   
> 
> 
> The IETF Secretariat
> 
> 
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