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Re: [Detnet] [mpls] [Pals] draft-decraene-mpls-slid-encoded-entropy-label-id (was RE: Please review the PALS/MPLS/DetNet Joint Session minutes)

Tony Li <tony.li@tony.li> Fri, 01 April 2022 18:14 UTC

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From: Tony Li <tony.li@tony.li>
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Date: Fri, 01 Apr 2022 11:14:11 -0700
In-Reply-To: <30511_1648836374_62473F16_30511_19_1_82b5ca100b1840b7aebd34557de52bdc@orange.com>
Cc: John E Drake <jdrake=40juniper.net@dmarc.ietf.org>, mpls <mpls@ietf.org>, detnet WG <detnet@ietf.org>, "pals@ietf.org" <pals@ietf.org>, "Henderickx, Wim (Nokia - BE/Antwerp)" <wim.henderickx@nokia.com>, Greg Mirsky <gregimirsky@gmail.com>
To: bruno.decraene@orange.com
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Subject: Re: [Detnet] [mpls] [Pals] draft-decraene-mpls-slid-encoded-entropy-label-id (was RE: Please review the PALS/MPLS/DetNet Joint Session minutes)
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Bruno,


> On Apr 1, 2022, at 11:06 AM, <bruno.decraene@orange.com> <bruno.decraene@orange.com> wrote:
> 
> Extending your proposal to support in-stack data effectively puts us at draft-jags-mpls-ext-hdr-00, with the backward compatibility issues that we’ve discussed. That is, IMHO, no longer in the realm of acceptable risk.
> [Bruno] Extending the proposal to add LSE requires signaling that the Egress support that capability. Solutions requiring a new SPL requires a similar signaling. In both cases, I don’t think that this may be called a backward compatibility issue, if but so, I think the statement equally applies to other proposals defining a new SPL


If you add LSE and use signaling to avoid incapable nodes, then signaling must identify every node that could potentially pop the EL sub-stack. If EL has been populated multiple times, that is potentially more than the Egress node. 

Yes, requiring a new SPL requires exactly the same signaling. This is the point that we’ve been making: there is no advantage to reusing ELI. It becomes the same. Other proposals are not claiming backward compatibility.

Tony

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