Postcard-based On-Path Flow Data Telemetry
draft-song-ippm-postcard-based-telemetry-04

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IPPM                                                        H. Song, Ed.
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                 T. Zhou
Expires: December 14, 2019                                         Z. Li
                                                                  Huawei
                                                                 J. Shin
                                                              SK Telecom
                                                                  K. Lee
                                                                   LG U+
                                                           June 12, 2019

               Postcard-based On-Path Flow Data Telemetry
              draft-song-ippm-postcard-based-telemetry-04

Abstract

   The Postcard-Based Telemetry (PBT) allows network OAM applications to
   collect telemetry data about any user packet.  Unlike the E2E and
   trace modes in in-situ OAM (IOAM), PBT does not require user packets
   to carry any telemetry data, but directly exports the telemetry data
   from network nodes to a collector through separated OAM packets
   called postcards.  Two variations of PBT, PBT-I and PBT-M, are
   described.  PBT-I requires inserting an instruction header to user
   packets to guide the data collection.  PBT-I is designed as another
   mode of IOAM, Per-Hop Postcard (PHP), to complement the existing
   operational modes of IOAM.  PBT-M only marks the user packets or
   configure the flow filter to invoke the data collection.  PBT-M also
   provides a complement to IOAM and address several implementation and
   deployment challenges of it.

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   This Internet-Draft will expire on December 14, 2019.

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

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Table of Contents

   1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  PBT-M: Postcard-based Telemetry with Packet Marking . . . . .   5
     2.1.  New Requirements  . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Solution Description  . . . . . . . . . . . . . . . . . .   6
     2.3.  New Challenges  . . . . . . . . . . . . . . . . . . . . .   7
     2.4.  Considerations on PBT-M Design  . . . . . . . . . . . . .   8
       2.4.1.  Packet Marking  . . . . . . . . . . . . . . . . . . .   8
       2.4.2.  Flow Path Discovery . . . . . . . . . . . . . . . . .   8
       2.4.3.  Packet Identity for Export Data Correlation . . . . .   9
     2.5.  Avoid Packet Marking through Node Configuration . . . . .   9
   3.  PBT-I: Postcard-based Telemetry with Instruction Header . . .  10
     3.1.  Solution Description  . . . . . . . . . . . . . . . . . .  11
     3.2.  PHP Header  . . . . . . . . . . . . . . . . . . . . . . .  12
   4.  Postcard Format . . . . . . . . . . . . . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  13
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   9.  Informative References  . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

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 on-path flow data reflect
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