Postcard-based In-band Flow Data Telemetry
draft-song-ippm-postcard-based-telemetry-02

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IPPM                                                        H. Song, Ed.
Internet-Draft                                                   T. Zhou
Intended status: Standards Track                                   Z. Li
Expires: September 8, 2019                                        Huawei
                                                                 J. Shin
                                                              SK Telecom
                                                           March 7, 2019

               Postcard-based In-band Flow Data Telemetry
              draft-song-ippm-postcard-based-telemetry-02

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 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 a complement to IOAM and address several implementation and
   deployment challenges of it.

Status of This Memo

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   This Internet-Draft will expire on September 8, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Song, et al.            Expires September 8, 2019               [Page 1]
Internet-Draft          Postcard-Based Telemetry              March 2019

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Table of Contents

   1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  PBT-M: Postcard-based Telemetry with Packet Marking . . . . .   4
     2.1.  New Requirements  . . . . . . . . . . . . . . . . . . . .   5
     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.  Postcard Format . . . . . . . . . . . . . . . . . . . . . . .  12
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  13
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   9.  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