SRv6 In-situ Active Measurement
draft-song-spring-siam-00
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Active Internet-Draft (individual)
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Haoyu Song
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Tian Pan
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2020-12-15
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SPRING H. Song
Internet-Draft Futurewei Technologies
Intended status: Standards Track T. Pan
Expires: June 18, 2021 BUPT
December 15, 2020
SRv6 In-situ Active Measurement
draft-song-spring-siam-00
Abstract
This draft describes an in-band active measurement method for SRv6.
A probing packet contains an SRH with a flag bit set. The IOAM
header and data are encapsulated in UDP payload. The probing packet
originates from a segment source node and terminates at a configured
segment endpoint node. Each segment node on the path, when detecting
the flag, parses the UDP header and the IOAM header, and adds data to
the IOAM node data fields. Multiple applications can be supported by
the method.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119][RFC8174] when, and only when, they appear in all
capitals, as shown here.
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on June 18, 2021.
Song & Pan Expires June 18, 2021 [Page 1]
Internet-Draft SRv6 In-situ Active Measurement December 2020
Copyright Notice
Copyright (c) 2020 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
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. In-situ Active Measurement for SRv6 . . . . . . . . . . . . . 3
3. Network Operation . . . . . . . . . . . . . . . . . . . . . . 5
4. Applications . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Probing Packet Type Extension . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
9.1. Normative References . . . . . . . . . . . . . . . . . . 6
9.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
To support SRv6 network operation, we need various means to collect
data and measure the performance of SRv6 network.
[I-D.ietf-6man-spring-srv6-oam] provides some mechanisms for SRv6
OAM. Some other general methods for performance measurement such as
[RFC8762] can also be applied for SRv6. However, these methods have
limited data coverage and measurement capability.
[I-D.ietf-ippm-ioam-data] supports extensible data collection for
user traffic. It is beneficial for SRv6 network monitor and
measurement. [I-D.ali-spring-ioam-srv6] proposes to encapsulate IOAM
in SRH TLV. However, IOAM's overhead may cause packet fragmentation
and its processing may affect the packet forwarding throughput.
Moreover, due to the extension header limitations asserted by
[RFC8200], it is not easy to come up with a scheme to encapsulate the
IOAM header and data in other locations in SRv6 user packets.
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Internet-Draft SRv6 In-situ Active Measurement December 2020
Fortunately, the forwarding behavior in SRv6 networks is determined
by the SRH. The IOAM header and data do not need to be added to user
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