[mif] prefix cost and RIO/RFC 4191

John Kaippallimalil <John.Kaippallimalil@huawei.com> Sun, 17 April 2016 23:29 UTC

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From: John Kaippallimalil <John.Kaippallimalil@huawei.com>
To: "dthaler@microsoft.com" <dthaler@microsoft.com>, "mif@ietf.org" <mif@ietf.org>
Thread-Topic: prefix cost and RIO/RFC 4191
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Date: Sun, 17 Apr 2016 23:29:18 +0000
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Cc: Peter McCann <Peter.McCann@huawei.com>
Subject: [mif] prefix cost and RIO/RFC 4191
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Hi Dave,
Following up on your suggestion - in mif IETF 95 - to consider RFC 4191 /RIO values (L/M/H) for conveying dmm prefix cost (https://tools.ietf.org/html/draft-mccann-dmm-prefixcost-03):
RIO values represent preferences for a destination route/prefix - these are preferences per router, and not per on-link prefix.

In the case of dmm-prefixcost, they are values in PIO meta data representing cost per on-link prefix (single link, and single access router).
Prefix-cost is low (preferred) at initial attachment,  and increases as the MN (mobile node) moves further away (e.g., PMIP tunnel across short, high speed backhaul may result in medium costs, and PMIP tunnel across a multiple backhaul/WAN network results in much higher costs).

RIO would not be able to represent values for such multiple on-link prefixes.
Is my understanding of RFC 4191 /the use of RIO correct?