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[Lsr] IS-IS Requirements for Area Abstraction (Corrected Alias for ADs)

"Acee Lindem (acee)" <acee@cisco.com> Mon, 27 January 2020 18:20 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "lsr@ietf.org" <lsr@ietf.org>
CC: "rtg-ads@ietf.org" <rtg-ads@ietf.org>
Thread-Topic: IS-IS Requirements for Area Abstraction (Corrected Alias for ADs)
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Date: Mon, 27 Jan 2020 17:17:49 +0000
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Subject: [Lsr] IS-IS Requirements for Area Abstraction (Corrected Alias for ADs)
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Speaking as WG Co-chair:

At IETF 107, we had a protracted discussion of several drafts having  goal of reducing the amount of link-state information that must be flooded into the level-2 area. We have two drafts that do this essentially via abstraction of the level-1 areas. These are:

https://www.ietf.org/id/draft-li-lsr-isis-area-proxy-01.txt
https://www.ietf.org/id/draft-chen-isis-ttz-07.txt

There are various reasons why these drafts can’t consolidated involving both IPR and government restrictions. Refer to https://datatracker.ietf.org/meeting/106/materials/minutes-106-lsr-00 for the complete discussion.

We have another draft that also reduces the amount of link-state information each IS-IS router must maintain but using IS-IS reflectors. This is slightly different but also avoids leaking all the level-1 area link-state to the level-2 area.

https://www.ietf.org/id/draft-przygienda-lsr-flood-reflection-01.txt

Given the amount of overlap and the conflicts amongst these drafts, the chairs/Ads are now asking whether there is a really a strong requirement to advance one or more of these documents. Especially given that we are already moving forward with both IS-IS/OSPF flooding reductions and the Hierarchal IS-IS work. Additionally,  we anticipate we’ll reach an impasse in consolidating these drafts. We’d really like to hear from the operators that would deploy these mechanisms.

Thanks,
Acee and Chris

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