A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Application-Layer Traffic Optimization WG of
the IETF.
Title : ALTO Performance Cost Metrics
Authors : Qin Wu
Y. Richard Yang
Young Lee
Dhruv Dhody
Sabine Randriamasy
Luis Miguel Contreras
Filename : draft-ietf-alto-performance-metrics-11.txt
Pages : 31
Date : 2020-06-12
Abstract:
Cost metric is a basic concept in Application-Layer Traffic
Optimization (ALTO), and is used in basic ALTO services including
both the cost map service and the endpoint cost service.
Different applications may use different cost metrics, but the ALTO
base protocol [RFC7285] defines only a single cost metric, i.e., the
generic "routingcost" metric; see Sec. 14.2 of [RFC7285]. Hence, if
the ALTO client of an application wants to issue a cost map or an
endpoint cost request to determine the resource provider that offers
better delay performance (i.e., low-delay) to a resource consumer,
the base protocol does not define the cost metric to be used.
This document addresses the issue by introducing network performance
metrics, including network delay, jitter, packet loss rate, hop
count, and bandwidth. The ALTO server may derive and aggregate such
performance metrics from routing protocols such as BGP-LS, OSPF-TE
and ISIS-TE, or from end-to-end traffic management tools, and then
expose the information to allow applications to determine "where" to
connect based on network performance criteria.
There are multiple sources to derive the performance metrics. For
example, whether the metric reported is an estimation based on
measurements or it is a service-level agreement (SLA) can define the
meaning of the performance metric. Hence, an application may need
additional contextual information beyond the metric value. This
document introduces an additional "cost-context" field to the ALTO
"cost-type" field to convey such information.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-alto-performance-metrics/
There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-alto-performance-metrics-11
https://datatracker.ietf.org/doc/html/draft-ietf-alto-performance-metrics-11
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https://www.ietf.org/rfcdiff?url2=draft-ietf-alto-performance-metrics-11
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