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Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators

"Zafar Ali (zali)" <zali@cisco.com> Mon, 06 June 2022 03:36 UTC

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "pals-chairs@ietf.org" <pals-chairs@ietf.org>, DetNet Chairs <detnet-chairs@ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>
Thread-Topic: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators
Thread-Index: AQHYdGtSVPd1R0hyFkiAw3Z/WCl3ra1BgRiA
Date: Mon, 06 Jun 2022 03:35:41 +0000
Message-ID: <998A24B2-6938-4402-B0AF-A2DFF4A60EA6@cisco.com>
References: <6e5c6fa9-539f-80c3-7c92-5b97ad67560c@pi.nu>
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Subject: Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators
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Dear chairs and the WG: 

I feel, we need to qualify the scope of the “(2) re-purposing the ELI SPL” question 
I.e., we need to answer the poll from a short term perspective and the long term view

As discussed during the PALS session at IETF113, https://datatracker.ietf.org/doc/draft-decraene-mpls-slid-encoded-entropy-label-id/ meets our immediate needs; thanks to the following attributes: 
* Hardware efficient 
    + It minimized the label stack (EL is used for both the load-balancing and the immediate additional use-cases with "8" indicators) 
* Enables faster and incremental deployments 
    + Thanks to wide support of ELI on current HW
    + Preserves the backward compatibility (with legacy devices) 
* Reuses control plan 
    + Does not require extensions to signal support (in BGP, ISIS, OSPF, BGP-LS, LDP, RSVP-TE, etc.)

In summary, IMO the progression of draft-decraene-mpls-slid-encoded-entropy-label-id as the “starting” point should not be mixed up with the question in this poll

Thanks

Regards … Zafar
 

On 5/30/22, 5:22 PM, "mpls on behalf of Loa Andersson" <mpls-bounces@ietf.org on behalf of loa@pi.nu> wrote:

    MPLS Working Group, MPLS Open DT,

    The MPLS Network Actions (MNA) framework requires a method of indicating 
    the presence of a Network Action and any Ancillary Data.

    Is the consensus of the working group that we do this by:

       (1) allocating a new SPL for Network Action Indicators?

       (2) re-purposing the ELI SPL?

       (3) using some other method of indicating this such as making it an
           additional property of an ordinary label?

    Please respond to the MPLS WG mail list.

    Loa Andersson
    for the Open DT wg chairs

    -- 
    Loa Andersson                        email: loa@pi.nu
    Senior MPLS Expert                          loa.pi.nu@gmail.com
    Bronze Dragon Consulting             phone: +46 739 81 21 64

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