Postcard-based On-Path Flow Data Telemetry
draft-song-ippm-postcard-based-telemetry-07

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IPPM                                                        H. Song, Ed.
Internet-Draft                                                 Futurewei
Intended status: Informational                                   T. Zhou
Expires: October 15, 2020                                          Z. Li
                                                                  Huawei
                                                                 J. Shin
                                                              SK Telecom
                                                                  K. Lee
                                                                   LG U+
                                                          April 13, 2020

               Postcard-based On-Path Flow Data Telemetry
              draft-song-ippm-postcard-based-telemetry-07

Abstract

   The document describes a variation of the Postcard-Based Telemetry
   (PBT), the marking-based PBT.  Unlike the instruction-based PBT, as
   embodied in [I-D.ietf-ippm-ioam-direct-export], the marking-based PBT
   does not require the encapsulation of a telemetry instruction header
   so it avoids some of the implementation challenges of the
   instruction-based PBT.  This documents discuss the issues and
   solutions of the marking-based PBT.

Status of This Memo

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   This Internet-Draft will expire on October 15, 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Song, et al.            Expires October 15, 2020                [Page 1]
Internet-Draft          Postcard-Based Telemetry              April 2020

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Table of Contents

   1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  PBT-M: Marking-based PBT  . . . . . . . . . . . . . . . . . .   4
   3.  New Challenges  . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Considerations on PBT-M Design  . . . . . . . . . . . . . . .   6
     4.1.  Packet Marking  . . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Flow Path Discovery . . . . . . . . . . . . . . . . . . .   7
     4.3.  Packet Identity for Export Data Correlation . . . . . . .   8
     4.4.  Avoid Packet Marking through Node Configuration . . . . .   8
   5.  Postcard Format . . . . . . . . . . . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   10. Informative References  . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

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.

   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
   data plane devices allow user-defined data collection or conditional
   data collection based on trigger events.  Such on-path flow data are
   from and about the live user traffic, which complement the data
   acquired through other passive and active OAM mechanisms such as
   IPFIX [RFC7011] and ICMP [RFC2925].

   On-path telemetry was developed to cater the need for collecting on-
   path flow data.  There are two basic modes for on-path telemetry: the