Postcard-based On-Path Flow Data Telemetry
draft-song-ippm-postcard-based-telemetry-06

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IPPM                                                        H. Song, Ed.
Internet-Draft                                                 Futurewei
Intended status: Informational                                   T. Zhou
Expires: May 1, 2020                                               Z. Li
                                                                  Huawei
                                                                 J. Shin
                                                              SK Telecom
                                                                  K. Lee
                                                                   LG U+
                                                        October 29, 2019

               Postcard-based On-Path Flow Data Telemetry
              draft-song-ippm-postcard-based-telemetry-06

Abstract

   The Postcard-Based Telemetry (PBT) allows network OAM applications to
   directly collect and export telemetry data about any user packet at
   each node on the forwarding path.  PBT has two variations, PBT-I and
   PBT-M.  PBT-I requires inserting an instruction header to user
   packets to guide the data collection.  An implementation of PBT-I is
   the IOAM Direct Export option described in
   [I-D.ioamteam-ippm-ioam-direct-export].  In contrast, PBT-M only
   marks the user packets or configure the flow filter to invoke the
   data collection and postcard export.  PBT complements IOAM trace
   option by addressing several specific implementation and deployment
   challenges.

Status of This Memo

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   This Internet-Draft will expire on May 1, 2020.

Song, et al.               Expires May 1, 2020                  [Page 1]
Internet-Draft          Postcard-Based Telemetry            October 2019

Copyright Notice

   Copyright (c) 2019 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
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   described in the Simplified BSD License.

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
       2.4.4.  Avoid Packet Marking through Node Configuration . . .   9
   3.  PBT-I: Postcard-based Telemetry with Instruction Header . . .  10
     3.1.  Solution Description  . . . . . . . . . . . . . . . . . .  11
     3.2.  Implementation  . . . . . . . . . . . . . . . . . . . . .  12
   4.  Postcard Format . . . . . . . . . . . . . . . . . . . . . . .  12
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   9.  Informative References  . . . . . . . . . . . . . . . . . . .  12
   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 on-path 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.

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