Export User Flow Telemetry Data by Postcard Packets
draft-song-ippm-postcard-based-telemetry-00

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IPPM                                                        H. Song, Ed.
Internet-Draft                                                   T. Zhou
Intended status: Standards Track                                   Z. Li
Expires: April 23, 2019                                           Huawei
                                                        October 20, 2018

          Export User Flow Telemetry Data by Postcard Packets
              draft-song-ippm-postcard-based-telemetry-00

Abstract

   This document describes a proposal which allows network OAM
   applications to collect telemetry data about any user packet.  Unlike
   similar techniques such as INT and in-situ OAM, the Postcard-Based
   Telemetry (PBT) does not require inserting telemetry data into user
   packets, but directly exports the telemetry data to a collector
   through separated OAM packets called postcards.  Two variations of
   PBT are described in this document: one requires inserting an
   instruction header to user packets to guide the data collection and
   the other only marks the user packets to invoke the data collection.
   Each has its own pros and cons.  Either way, the postcards for a
   single user packet are from multiple devices and need to be
   correlated at the collector, which is a unique issue pertaining to
   PBT.  Whereas, PBT provides an alternative to INT and address several
   implementation and deployment challenges of the INT-based solutions.

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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 23, 2019.

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Internet-Draft          Postcard-Based Telemetry            October 2018

Copyright Notice

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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
   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  . . . . . . . . . . . . . . . . . . . . . . . .  13
   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 path-associated 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 the detailed forwarding path, the
   timestamp/latency at each network node, and other information.  The

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