Multi-Cost ALTO
draft-ietf-alto-multi-cost-06
The information below is for an old version of the document |
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Active Internet-Draft (alto WG)
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2017-03-10
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draft-randriamasy-alto-multi-cost
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IETF
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Intended RFC status |
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Proposed Standard
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pdf
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bibtex
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Jan Seedorf
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Shepherd write-up |
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Show
(last changed 2017-02-23)
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Publication Requested
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Mirja Kühlewind
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Send notices to |
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"Jan Seedorf" <ietf@j-f-s.de>
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Network Working Group S. Randriamasy
Internet-Draft W. Roome
Intended status: Standards Track Nokia Bell Labs
Expires: September 11, 2017 N. Schwan
Thales Deutschland
March 10, 2017
Multi-Cost ALTO
draft-ietf-alto-multi-cost-06
Abstract
The ALTO (Application Layer-Traffic Optimization) Protocol
([RFC7285]) defines several services that return various metrics
describing the costs between network endpoints. An ALTO Server may
offer a variety of cost metrics, based on latency,bandwidth, hop
count, jitter, or whatever else the ALTO Server deems useful. For
example, when downloading a file that is mirrored on several sites, a
user application may consider more than one metric, perhaps trading
bandwidth for latency to determine the most efficient mirror site.
While the base ALTO Protocol allows an ALTO Client to use more than
one cost metric, to do so, the Client must request each metric
separately. This document defines a new service that allows a Client
to retrieve several cost metrics with one request, which is
considerably more efficient. In addition, this document extends the
ALTO constraint tests to allow a user to specify an arbitrary logical
combination of tests on several cost metrics.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
Randriamasy, et al. Expires September 11, 2017 [Page 1]
Internet-Draft Multi-Cost ALTO March 2017
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 11, 2017.
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Overview Of Approach . . . . . . . . . . . . . . . . . . . . 5
3.1. Multi-Cost Data Format . . . . . . . . . . . . . . . . . 5
3.2. Compatibility With Legacy ALTO Clients . . . . . . . . . 6
3.3. Filtered Multi Cost Map Resources . . . . . . . . . . . . 6
3.4. Endpoint Cost Service Resources . . . . . . . . . . . . . 7
3.5. Full Cost Map Resources . . . . . . . . . . . . . . . . . 7
3.6. Extended Constraint Tests . . . . . . . . . . . . . . . . 8
3.6.1. Extended constraint predicates . . . . . . . . . . . 8
3.6.2. Extended logical combination of predicates . . . . . 8
3.6.3. Testable Cost Types in constraints . . . . . . . . . 9
3.6.4. Testable Cost Type Names in IRD capabilities . . . . 10
3.6.5. Legacy ALTO Client issues . . . . . . . . . . . . . . 10
4. Protocol Extensions for Multi-Cost ALTO Transactions . . . . 11
4.1. Filtered Cost Map Extensions . . . . . . . . . . . . . . 11
4.1.1. Capabilities . . . . . . . . . . . . . . . . . . . . 12
4.1.2. Accept Input Parameters . . . . . . . . . . . . . . . 13
4.1.3. Response . . . . . . . . . . . . . . . . . . . . . . 16
4.2. Endpoint Cost Service Extensions . . . . . . . . . . . . 16
4.2.1. Capabilities . . . . . . . . . . . . . . . . . . . . 16
4.2.2. Accept Input Parameters . . . . . . . . . . . . . . . 16
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