draft-ietf-isis-te-metric-extensions-10.txt   draft-ietf-isis-te-metric-extensions-11.txt 
Networking Working Group S. Previdi, Ed. Networking Working Group S. Previdi, Ed.
Internet-Draft Cisco Systems, Inc. Internet-Draft Cisco Systems, Inc.
Intended status: Standards Track S. Giacalone Intended status: Standards Track S. Giacalone
Expires: August 12, 2016 Unaffiliated Expires: August 15, 2016 Unaffiliated
D. Ward D. Ward
Cisco Systems, Inc. Cisco Systems, Inc.
J. Drake J. Drake
Juniper Networks Juniper Networks
Q. Wu Q. Wu
Huawei Huawei
February 9, 2016 February 12, 2016
IS-IS Traffic Engineering (TE) Metric Extensions IS-IS Traffic Engineering (TE) Metric Extensions
draft-ietf-isis-te-metric-extensions-10 draft-ietf-isis-te-metric-extensions-11
Abstract Abstract
In certain networks, such as, but not limited to, financial In certain networks, such as, but not limited to, financial
information networks (e.g. stock market data providers), network information networks (e.g. stock market data providers), network
performance criteria (e.g. latency) are becoming as critical to data performance criteria (e.g. latency) are becoming as critical to data
path selection as other metrics. path selection as other metrics.
This document describes extensions to IS-IS Traffic Engineering This document describes extensions to IS-IS Traffic Engineering
Extensions (RFC5305) such that network performance information can be Extensions (RFC5305) such that network performance information can be
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 12, 2016. This Internet-Draft will expire on August 15, 2016.
Copyright Notice Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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1. If the measured parameter falls outside a configured upper 1. If the measured parameter falls outside a configured upper
bound for all but the min delay metric (or lower bound for bound for all but the min delay metric (or lower bound for
min delay metric only) and the advertised sub-TLV is not min delay metric only) and the advertised sub-TLV is not
already outside that bound or, already outside that bound or,
2. If the difference between the last advertised value and 2. If the difference between the last advertised value and
current measured value exceed a configured threshold then, current measured value exceed a configured threshold then,
3. The advertisement is made immediately. 3. The advertisement is made immediately.
4. For sub-TLVs which include an A-bit (except min/max 4. For sub-TLVs which include an A-bit, an additional
delay), an additional threshold SHOULD be included threshold SHOULD be included corresponding to the
corresponding to the threshold for which the performance threshold for which the performance is considered
is considered anomalous (and sub-TLVs with the A-bit are anomalous (and sub-TLVs with the A-bit are sent). The
sent). The A-bit is cleared when the sub-TLV's performance A-bit is cleared when the sub-TLV's performance has
has been below (or re-crosses) this threshold for an been below (or re-crosses) this threshold for an
advertisement interval(s) to permit fail back. advertisement interval(s) to permit fail back.
To prevent oscillations, only the high threshold or the low threshold To prevent oscillations, only the high threshold or the low threshold
(but not both) may be used to trigger any given sub-TLV that supports (but not both) may be used to trigger any given sub-TLV that supports
both. both.
Additionally, once outside of the bounds of the threshold, any Additionally, once outside of the bounds of the threshold, any
readvertisement of a measurement within the bounds would remain readvertisement of a measurement within the bounds would remain
governed solely by the measurement interval for that sub-TLV. governed solely by the measurement interval for that sub-TLV.
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