Postcard-based In-band Flow Data Telemetry
draft-song-ippm-postcard-based-telemetry-01

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Last updated 2018-12-11
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IPPM                                                        H. Song, Ed.
Internet-Draft                                                   T. Zhou
Intended status: Standards Track                                   Z. Li
Expires: June 14, 2019                                            Huawei
                                                                 J. Shin
                                                              SK Telecom
                                                       December 11, 2018

               Postcard-based In-band Flow Data Telemetry
              draft-song-ippm-postcard-based-telemetry-01

Abstract

   The Postcard-Based Telemetry (PBT) allows network OAM applications to
   collect telemetry data about any user packet.  Unlike similar
   techniques such as in-situ OAM (IOAM), PBT does not require user
   packets to carry the telemetry data, but directly exports the
   telemetry data from the data collecting node to a collector through
   separated OAM packets called postcards.  Two variations of PBT are
   described: one requires inserting an instruction header to user
   packets to guide the data collection and the other only marks the
   user packets or configure the flow filter to invoke the data
   collection.  PBT provides an alternative to IOAM and address several
   implementation and deployment challenges of it.

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Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Song, et al.              Expires June 14, 2019                 [Page 1]
Internet-Draft          Postcard-Based Telemetry           December 2018

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Table of Contents

   1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  PBT-M: Postcard-based Telemetry with Packet Marking . . . . .   4
     2.1.  New Requirements  . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Solution Description  . . . . . . . . . . . . . . . . . .   6
     2.3.  New Challenges  . . . . . . . . . . . . . . . . . . . . .   7
     2.4.  Considerations on PBT-M Design  . . . . . . . . . . . . .   7
       2.4.1.  Packet Marking  . . . . . . . . . . . . . . . . . . .   7
       2.4.2.  Flow Path Discovery . . . . . . . . . . . . . . . . .   8
       2.4.3.  Packet Identity for Export Data Correlation . . . . .   8
     2.5.  Avoid Packet Marking through Node Configuration . . . . .   9
   3.  PBT-I: Postcard-based Telemetry with Instruction Header . . .   9
     3.1.  Solution Description  . . . . . . . . . . . . . . . . . .  10
     3.2.  PBT-I Telemetry Instruction Header  . . . . . . . . . . .  11
     3.3.  Considerations on PBT-I Design  . . . . . . . . . . . . .  12
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   8.  Informative References  . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Motivation

   In order to gain detailed data plane visibility to support effective
   network OAM, it is important to be able to examine the trace of user
   packets along their forwarding paths.  Such in-band flow data reflect
   the state and status of each user packet's real-time experience and
   provide valuable information for network monitoring, measurement, and
   diagnosis.

   The telemetry data include but not limited to the detailed forwarding
   path, the timestamp/latency at each network node, and, in case of
   packet drop, the drop location and reason.  The emerging programmable
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