[mif] request for review: draft-mccann-dmm-prefixcost
John Kaippallimalil <John.Kaippallimalil@huawei.com> Fri, 18 March 2016 13:58 UTC
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From: John Kaippallimalil <John.Kaippallimalil@huawei.com>
To: "mif@ietf.org" <mif@ietf.org>
Thread-Topic: request for review: draft-mccann-dmm-prefixcost
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Date: Fri, 18 Mar 2016 13:56:49 +0000
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Subject: [mif] request for review: draft-mccann-dmm-prefixcost
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Hi, This is a request for a review of the draft in dmm, "Communicating Prefix Cost to Mobile Nodes"https://datatracker.ietf.org/doc/draft-mccann-dmm-prefixcost/ This draft was presented twice in dmm, and Brian Haberman suggested that we get reviews from 6man and mif. The draft proposes an prefix-cost sub option in RA to indicate the cost of maintaining the IP connection segment between host and access router. This can allow a host to select /attach to access connections with lower cost. Abstract: In a network implementing Distributed Mobility Management, it has been agreed that Mobile Nodes (MNs) should exhibit agility in their use of IP addresses. For example, an MN might use an old address for ongoing socket connections but use a new, locally assigned address for new socket connections. Determining when to assign a new address, and when to release old addresses, is currently an open problem. Making an optimal decision about address assignment and release must involve a tradeoff in the amount of signaling used to allocate the new addresses, the amount of utility that applications are deriving from the use of a previously assigned address, and the cost of maintaining an address that was assigned at a previous point of attachment. As the MN moves farther and farther from the initial point where an address was assigned, more and more resources are used to redirect packets destined for that IP address to its current location. The MN currently does not know the amount of resources used as this depends on mobility path and internal routing topology of the network(s) which are known only to the network operator. This document provides a mechanism to communicate to the MN the cost of maintaining a given prefix at the MN's current point of attachment so that the MN can make better decisions about when to release old addresses and assign new ones. BR, John
- [mif] request for review: draft-mccann-dmm-prefix… John Kaippallimalil