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Re: [mpls] draft-fang-mpls-label-forwarding-no-swap - how much does it really save?

Stewart Bryant <stbryant@cisco.com> Mon, 27 July 2015 14:30 UTC

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Date: Mon, 27 Jul 2015 15:30:16 +0100
From: Stewart Bryant <stbryant@cisco.com>
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To: Andrew Qu <andrew.qu@mediatek.com>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, Robert Raszuk <robert@raszuk.net>, Shahram Davari <davari@broadcom.com>
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Subject: Re: [mpls] draft-fang-mpls-label-forwarding-no-swap - how much does it really save?
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On 24/07/2015 09:06, Andrew Qu wrote:
>
> Hi Sasha,
>
> My comments in lines…
>
> *From:*mpls [mailto:mpls-bounces@ietf.org] *On Behalf Of *Alexander 
> Vainshtein
> *Sent:* Friday, July 24, 2015 7:26 AM
> *To:* Robert Raszuk; Shahram Davari
> *Cc:* mpls@ietf.org
> *Subject:* Re: [mpls] draft-fang-mpls-label-forwarding-no-swap - how 
> much does it really save?
>
> Hi all,
>
> Please note that CONTINUE in SPRING is:
>
> 1. A DP-agnostic primitive
>
> 2. *Implemented* as SWAP instruction with MPLS DP.
>
> [Andrew] You are contradicting with 1) and 2).
>
What Sasha says is correct
>
> With “CONTINUE” defined in SR draft,  for NEW ASIC to be designed,
>
> Why should I still use “SWAP” to achieve it?
>
.. because you need to be backwards compatible with
the deployed equipment and deployed networks.

If that is not a requirement in your world, then I suggest
that you get a new ethertype and call it MPLS2

- Stewart

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