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Re: [lisp] Comments on draft-ietf-lisp-eid-mobility-09 from the LISP WG presentation

"Marc Portoles Comeras (mportole)" <mportole@cisco.com> Tue, 22 March 2022 22:18 UTC

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From: "Marc Portoles Comeras (mportole)" <mportole@cisco.com>
To: Dino Farinacci <farinacci@gmail.com>
CC: "lisp@ietf.org list" <lisp@ietf.org>
Thread-Topic: [lisp] Comments on draft-ietf-lisp-eid-mobility-09 from the LISP WG presentation
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Subject: Re: [lisp] Comments on draft-ietf-lisp-eid-mobility-09 from the LISP WG presentation
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>>        • An EID registered with the same site-ID (and merge-bit) from different xTRs is merged. If site-IDs differ this is considered a move.
>Correct. But you have to deal with misconfiguration so 2 xTRs at the same site advertising a different site-ID doesn't look like a move. So the xTR-ID needs to be checked as well.

Perfect, let me add this to the updated version

>>        • For “discovery” purposes in multihomed groups: An L2 EID registered from one xTR and a specific site-ID, needs to be notified to all xTRs that are using that same site-ID
>You have to keep a list of xTR-IDs for a merged registration over time. And the list is cleared when a new xTR-ID is discovered with a different site-ID. Right?

Agree. I’ll also clarify this point in the updated version

Thanks!
Marc

From: Dino Farinacci <farinacci@gmail.com>
Date: Tuesday, March 22, 2022 at 11:36 AM
To: Marc Portoles Comeras (mportole) <mportole@cisco.com>
Cc: lisp@ietf.org list <lisp@ietf.org>
Subject: Re: [lisp] Comments on draft-ietf-lisp-eid-mobility-09 from the LISP WG presentation
> I believe we discussed this last time but, with the new perspective, couldn’t we just use the pair <IID, site-ID> to at least get per VLAN granularity in some of these decisions.

Yes, that would work better since the site-ID is in the Map-Register (where you need the xTR distinction) and the IID is in the EID encoding of the EID-record where you need the VLAN association. So this is ideal.

> We get the same benefits: no impact on the bis document, and some extra granularity in the choice of DF or more detail when implementing split horizon on the xTRs.

Right. Agree.

> And just to complete the story. When we use site-IDs this means that:
>
>        • An EID registered with the same site-ID (and merge-bit) from different xTRs is merged. If site-IDs differ this is considered a move.

Correct. But you have to deal with misconfiguration so 2 xTRs at the same site advertising a different site-ID doesn't look like a move. So the xTR-ID needs to be checked as well.

>        • For “discovery” purposes in multihomed groups: An L2 EID registered from one xTR and a specific site-ID, needs to be notified to all xTRs that are using that same site-ID

You have to keep a list of xTR-IDs for a merged registration over time. And the list is cleared when a new xTR-ID is discovered with a different site-ID. Right?

Dino

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