A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the IP Performance Metrics Working Group of the IETF.
Title : Model Based Metrics for Bulk Transport Capacity
Authors : Matt Mathis
Al Morton
Filename : draft-ietf-ippm-model-based-metrics-05.txt
Pages : 46
Date : 2015-06-13
Abstract:
We introduce a new class of model based metrics designed to determine
if a complete Internet path can meet predefined bulk transport
performance targets by applying a suite of IP diagnostic tests to
successive subpaths. The subpath-at-a-time tests can be robustly
applied to key infrastructure, such as interconnects or even
individual devices, to accurately detect if any part of the
infrastructure will prevent any path traversing it from meeting the
specified target performance.
The diagnostic tests consist of precomputed traffic patterns and
statistical criteria for evaluating packet delivery. The traffic
patterns are precomputed to mimic TCP or other transport protocol
over a long path but are constructed in such a way that they are
independent of the actual details of the subpath under test, end
systems or applications. Likewise the success criteria depends on
the packet delivery statistics of the subpath, as evaluated against a
protocol model applied to the target performance. The success
criteria also does not depend on the details of the subpath, end
systems or application. This makes the measurements open loop,
eliminating most of the difficulties encountered by traditional bulk
transport metrics.
Model based metrics exhibit several important new properties not
present in other Bulk Capacity Metrics, including the ability to
reason about concatenated or overlapping subpaths. The results are
vantage independent which is critical for supporting independent
validation of tests results from multiple Measurement Points.
This document does not define diagnostic tests directly, but provides
a framework for designing suites of IP diagnostics tests that are
tailored to confirming that infrastructure can meet a predetermined
target performance.
Interim DRAFT Formatted: Sat Jun 13 16:25:01 PDT 2015
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