Re: [Lsr] Genart last call review of draft-ietf-ospf-mpls-elc-13

Alvaro Retana <aretana.ietf@gmail.com> Thu, 14 May 2020 19:46 UTC

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From: Alvaro Retana <aretana.ietf@gmail.com>
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References: <158877512992.25308.14489968716385236242@ietfa.amsl.com> <5f206fd3-8918-9c1f-e403-8591c54acf83@cisco.com> <f11f10e9-7a4d-903c-726f-9e79c02410a5@dial.pipex.com> <DC25CF92-555B-4D7F-ABD9-4063416CA6AC@cisco.com>
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Date: Thu, 14 May 2020 12:46:09 -0700
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To: "Acee Lindem (acee)" <acee@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Elwyn Davies <elwynd@dial.pipex.com>, "gen-art@ietf.org" <gen-art@ietf.org>
Cc: "last-call@ietf.org" <last-call@ietf.org>, "draft-ietf-ospf-mpls-elc.all@ietf.org" <draft-ietf-ospf-mpls-elc.all@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] Genart last call review of draft-ietf-ospf-mpls-elc-13
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Hi!

Yes, we cannot specify something that routers unaware of this specification
should or shouldn’t do.

I believe that Elwyn’s point is this: *if a router supports this
specification* then when would it not advertise the ELC?  IOW, the
specification only obviously applies to implementations that support it —
in that case I would think that if a router supports ELs on all of its
interfaces then it would always advertise the ELC, right?


Thanks!

Alvaro.

On May 11, 2020 at 3:18:34 PM, Acee Lindem (acee) (acee@cisco.com) wrote:

Note that the optionality of ERLD-MSD advertisements appears on
reflection to be a more serious issue than just an editorial nit.

So what would you suggest? There are existing implementations that support
multipath forwarding entropy using MPLS entropy labels but do not signal
that capability in OSPF. We can't have a document that retroactively
mandates that they signal it. This wouldn't be backward compatible. How can
you possibly see this as a serious issue?