A Connectivity Monitoring Metric for IPPM
draft-geib-ippm-connectivity-monitoring-02
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ippm R. Geib, Ed.
Internet-Draft Deutsche Telekom
Intended status: Standards Track January 2, 2020
Expires: July 5, 2020
A Connectivity Monitoring Metric for IPPM
draft-geib-ippm-connectivity-monitoring-02
Abstract
Within a Segment Routing domain, segment routed measurement packets
can be sent along pre-determined paths. This enables new kinds of
measurements. Connectivity monitoring allows to supervise the state
and performance of a connection or a (sub)path from one or a few
central monitoring systems. This document specifies a suitable
type-P connectivity monitoring metric.
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
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and may be updated, replaced, or obsoleted by other documents at any
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 July 5, 2020.
Copyright Notice
Copyright (c) 2020 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
Geib Expires July 5, 2020 [Page 1]
Internet-Draft Abbreviated Title January 2020
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. A brief segment routing connectivity monitoring framework . . 4
3. Singleton Definition for Type-P-SR-Path-Connectivity-and-
Congestion . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1. Metric Name . . . . . . . . . . . . . . . . . . . . . . . 7
3.2. Metric Parameters . . . . . . . . . . . . . . . . . . . . 7
3.3. Metric Units . . . . . . . . . . . . . . . . . . . . . . 8
3.4. Definition . . . . . . . . . . . . . . . . . . . . . . . 8
3.5. Discussion . . . . . . . . . . . . . . . . . . . . . . . 8
3.6. Methodologies . . . . . . . . . . . . . . . . . . . . . . 9
3.7. Errors and Uncertainties . . . . . . . . . . . . . . . . 10
3.8. Reporting the Metric . . . . . . . . . . . . . . . . . . 11
4. Singleton Definition for Type-P-SR-Path-Round-Trip-Delay-
Estimate . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1. Normative References . . . . . . . . . . . . . . . . . . 11
7.2. Informative References . . . . . . . . . . . . . . . . . 12
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
Within a Segment Routing domain, Segment Routing enables sending
measurement packets along pre-determined segment routed paths
[RFC8402]. A segment routed path may consist of pre-determined sub
paths down to specific router-interfaces. It may also consist of sub
paths spanning multiple routers, given that all segments to address a
desired path are available and known at the SR domain edge interface.
A Path Monitoring System or PMS (see [RFC8403]) is a dedicated
central Segment Routing domain monitoring device (as compared to a
distributed monitoring approach based on router-data and -functions
only). Monitoring individual sub-paths or point-to-point connections
is executed for different purposes. IGP exchanges hello messages
between neighbors to keep alive routing and switfly adapt routing to
topology changes. Network Operators may be interested in monitoring
connectivity and congestion of interfaces or sub-paths at a timescale
of seconds, minutes or hours. In both cases, the periodicity is
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