Multi-Cost Application-Layer Traffic Optimization (ALTO)
RFC 8189
Document | Type | RFC - Proposed Standard (October 2017; No errata) | |
---|---|---|---|
Authors | Sabine Randriamasy , Wendy Roome , Nico Schwan | ||
Last updated | 2018-12-20 | ||
Replaces | draft-randriamasy-alto-multi-cost | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Jan Seedorf | ||
Shepherd write-up | Show (last changed 2017-02-23) | ||
IESG | IESG state | RFC 8189 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Mirja Kühlewind | ||
Send notices to | "Jan Seedorf" <ietf@j-f-s.de> | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | No IANA Actions |
Internet Engineering Task Force (IETF) S. Randriamasy Request for Comments: 8189 W. Roome Category: Standards Track Nokia Bell Labs ISSN: 2070-1721 N. Schwan Thales Deutschland October 2017 Multi-Cost Application-Layer Traffic Optimization (ALTO) Abstract The Application-Layer Traffic Optimization (ALTO) protocol, specified in RFC 7285, defines several services that return various metrics describing the costs between network endpoints. This document defines a new service that allows an ALTO Client to retrieve several cost metrics in a single request for an ALTO filtered cost map and endpoint cost map. In addition, it extends the constraints to further filter those maps by allowing an ALTO Client to specify a logical combination of tests on several cost metrics. Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc8189. Randriamasy, et al. Standards Track [Page 1] RFC 8189 Multi-Cost ALTO October 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 (https://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. Randriamasy, et al. Standards Track [Page 2] RFC 8189 Multi-Cost ALTO October 2017 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 5 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Overview Of Approach . . . . . . . . . . . . . . . . . . . . 6 3.1. Multi-Cost Data Format . . . . . . . . . . . . . . . . . 6 3.2. Compatibility with Legacy ALTO Clients . . . . . . . . . 7 3.3. Filtered Multi-Cost Map Resources . . . . . . . . . . . . 7 3.4. Endpoint Cost Service Resources . . . . . . . . . . . . . 8 3.5. Full Cost Map Resources . . . . . . . . . . . . . . . . . 8 3.6. Extended Constraint Tests . . . . . . . . . . . . . . . . 8 3.6.1. Extended Constraint Predicates . . . . . . . . . . . 9 3.6.2. Extended Logical Combination of Predicates . . . . . 9 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 . . . . 12 4.1. Filtered Cost Map Extensions . . . . . . . . . . . . . . 12 4.1.1. Capabilities . . . . . . . . . . . . . . . . . . . . 13 4.1.2. Accept Input Parameters . . . . . . . . . . . . . . . 14 4.1.3. Response . . . . . . . . . . . . . . . . . . . . . . 17 4.2. Endpoint Cost Service Extensions . . . . . . . . . . . . 17 4.2.1. Capabilities . . . . . . . . . . . . . . . . . . . . 17 4.2.2. Accept Input Parameters . . . . . . . . . . . . . . . 18 4.2.3. Response . . . . . . . . . . . . . . . . . . . . . . 19 5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.1. Information Resource Directory . . . . . . . . . . . . . 19 5.2. Multi-Cost Filtered Cost Map: Example #1 . . . . . . . . 21 5.3. Multi-Cost Filtered Cost Map: Example #2 . . . . . . . . 23 5.4. Multi-Cost Filtered Cost Map: Example #3 . . . . . . . . 24 5.5. Multi-Cost Filtered Cost Map: Example #4 . . . . . . . . 25 5.6. Endpoint Cost Service . . . . . . . . . . . . . . . . . . 26 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 28Show full document text