Internet Engineering Task Force (IETF) A. Morton

Internet Engineering Task Force (IETF) A. Morton
Request for Comments: 7718 AT&T Labs
Updates: 4656 December 2015
Category: Standards Track
ISSN: 2070-1721

Registries for the One-Way Active Measurement Protocol (OWAMP)

Abstract

This memo describes the registries for OWAMP -- the One-Way Active
Measurement Protocol. The registries allow assignment of Mode bit
positions and OWAMP Command numbers. Per this memo, IANA has
established the registries for new features, called the OWAMP-Modes
registry and the OWAMP Control Command Number registry. This memo
updates RFC 4656.

Status of This Memo

This is an Internet Standards Track document.

This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.

Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7718.

Copyright Notice

Copyright (c) 2015 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
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.

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RFC 7718 OWAMP Registries December 2015

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 2
2. Purpose and Scope . . . . . . . . . . . . . . . . . . . . . . 3
3. IANA Considerations for OWAMP-Control Registries . . . . . . 3
3.1. Control Command Number Registry . . . . . . . . . . . . . 3
3.1.1. Registry Specification . . . . . . . . . . . . . . . 3
3.1.2. Registry Management . . . . . . . . . . . . . . . . . 3
3.1.3. Experimental Numbers . . . . . . . . . . . . . . . . 3
3.1.4. OWAMP-Control Command Numbers Initial Contents . . . 3
3.2. OWAMP-Modes . . . . . . . . . . . . . . . . . . . . . . . 4
3.2.1. Registry Specification . . . . . . . . . . . . . . . 4
3.2.2. Registry Management . . . . . . . . . . . . . . . . . 4
3.2.3. Experimental Numbers . . . . . . . . . . . . . . . . 4
3.2.4. OWAMP-Modes Initial Contents . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 6
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1. Normative References . . . . . . . . . . . . . . . . . . 6
5.2. Informative References . . . . . . . . . . . . . . . . . 6
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 7
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 7

1. Introduction

The One-Way Active Measurement Protocol (OWAMP) [RFC4656] was
prepared to support measurements of metrics specified by the IP
Performance Metrics (IPPM) working group in the IETF. The Two-Way
Active Measurement Protocol (TWAMP) [RFC5357] is an extension of
OWAMP. The TWAMP specification gathered wide review as it approached
completion, and the by-products were several recommendations for new
features in TWAMP. As a result, a registry of new features was
established for TWAMP. However, there were no new features proposed
for OWAMP until recently [RFC7717].

This memo establishes the needed registries for OWAMP and updates
[RFC4656].

1.1. Requirements Language

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].

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RFC 7718 OWAMP Registries December 2015

2. Purpose and Scope

The purpose and scope of this memo is to describe and request the
establishment of registries for future OWAMP [RFC4656] extensions.
IANA already administers the "Two-way Active Measurement Protocol
(TWAMP) Parameters", and this request follows a similar form (with
one exception identified below).

This memo also provides the initial contents for the OWAMP
registries.

3. IANA Considerations for OWAMP-Control Registries

The OWAMP-Control protocol coordinates the measurement capability.
All OWAMP-Control messages follow specifications defined in Section 3
of [RFC4656].

3.1. Control Command Number Registry

IANA has created an OWAMP-Control Command Number registry.

OWAMP-Control Commands follow specifications defined in Section 3.4
of [RFC4656].

3.1.1. Registry Specification

OWAMP-Control Command Numbers are specified in the first octet of
OWAMP-Control-Client command messages consistent with Section 3 of
[RFC4656]. There are a maximum of 256 command numbers.

3.1.2. Registry Management

Because the "OWAMP-Control Command Numbers" registry can contain only
256 values, and because OWAMP is an IETF protocol, these registries
MUST be updated only by "IETF Review" as specified in [RFC5226] (an
RFC that documents registry use and is approved by the IESG).

3.1.3. Experimental Numbers

One experimental value is currently assigned in the Command Numbers
Registry, as indicated in the initial contents below.

3.1.4. OWAMP-Control Command Numbers Initial Contents

OWAMP-Control Commands follows the procedure defined in Section 3.5
of [RFC4656] and in the remainder of Section 3 of that document.

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The complete set of OWAMP-Control Command Numbers are as follows
(including two reserved values):

OWAMP-Control Command Numbers

Value Description Semantics Reference
Definition
==========================================================
0 Reserved Section 3.1.4 RFC 7718
1 Request-Session Section 3.5 RFC 4656
2 Start-Sessions Section 3.7 RFC 4656
3 Stop-Sessions Section 3.8 RFC 4656
4 Fetch-Sessions Section 3.9 RFC 4656
5-253 Unassigned
254 Experimentation Section 3.1.4 RFC 7718
255 Reserved Section 3.1.4 RFC 7718

3.2. OWAMP-Modes

IANA has created an OWAMP-Modes registry.

3.2.1. Registry Specification

OWAMP-Modes are specified in OWAMP Server Greeting messages and Set-
up Response messages consistent with Section 3.1 of [RFC4656]. Modes
are currently indicated by setting single bits in the 32-bit Modes
field. However, more complex encoding may be used in the future.

3.2.2. Registry Management

Because the "OWAMP-Modes" are based on only 32 bit positions with
each position conveying a unique feature, and because OWAMP is an
IETF protocol, these registries MUST be updated only by "IETF Review"
as specified in [RFC5226] (an RFC that documents registry use and is
approved by the IESG). IANA SHOULD allocate monotonically increasing
bit positions when requested.

3.2.3. Experimental Numbers

No experimental bit positions are currently assigned in the Modes
registry, as indicated in the initial contents below.

3.2.4. OWAMP-Modes Initial Contents

OWAMP-Control connection establishment follows the procedure defined
in Section 3.1 of [RFC4656].

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In the OWAMP-Modes registry, assignments are straightforward on the
basis of bit positions, and there are no references to values -- this
is a difference from the comparable TWAMP registry (and a topic for
improvement in the TWAMP-Modes registry that is reconciled in
[RFC7717]).

An extension of the OWAMP-Modes is proposed in [RFC7717]. With this
extension, the complete set of OWAMP Mode bit positions are as
follows (including one reserved bit position):

OWAMP-Modes

Bit Semantics
Pos. Description Definition Reference
=======================================================
0 Unauthenticated Section 3.1 RFC 4656
1 Authenticated Section 3.1 RFC 4656
2 Encrypted Section 3.1 RFC 4656
3 Reserved Section 3.2.4 RFC 7718
------------------------------------------------------
4 IKEv2-derived Shared Section 3.2.4 RFC 7718
Secret Key of RFC 7718,
Section 5 of RFC 7717
of RFC 7717
------------------------------------------------------
5-31 Unassigned

In the original OWAMP Modes field, setting bit position 0, 1, or 2
indicated the security mode of the Control protocol, and the Test
protocol inherited the same mode (see Section 4 of [RFC4656]).

The value of the Modes field sent by the Server in the Server-
Greeting message is the bit-wise OR of the modes (bit positions) that
it is willing to support during this session. Thus, the five least
significant bits of the 32-bit Modes field are used. When no other
features are activated, the 27 most significant bits MUST be zero. A
Control-Client conforming to [RFC4656] MAY ignore the values in the
29 most significant bits of the Modes field, or it MAY support
features that are communicated in other bit positions, such as the
IKEv2-derived Shared Secret Key extension [RFC7717].

OWAMP and TWAMP registries for Modes may grow to contain different
features and functions due to the inherent differences in one-way and
two-way measurement configurations and the metrics they measure. No
attempt will be made to coordinate them unnecessarily, except for the
Reserved bit position 3 above. This is available for assignment if a
mixed security mode similar to [RFC5618] is defined for OWAMP; it
would allow alignment with the comparable TWAMP feature.

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4. Security Considerations

As this memo simply documents the creation of OWAMP registries, it
presents no new security or privacy issues for the Internet.

The security considerations that apply to any active measurement of
live networks are relevant here as well. See [RFC4656] and
[RFC5357].

Privacy considerations for measurement systems, particularly when
Internet users participate in the tests in some way, are described in
[RFC7594].

5. References

5.1. Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.

[RFC4656] Shalunov, S., Teitelbaum, B., Karp, A., Boote, J., and M.
Zekauskas, "A One-way Active Measurement Protocol
(OWAMP)", RFC 4656, DOI 10.17487/RFC4656, September 2006,
<http://www.rfc-editor.org/info/rfc4656>.

[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
DOI 10.17487/RFC5226, May 2008,
<http://www.rfc-editor.org/info/rfc5226>.

[RFC5357] Hedayat, K., Krzanowski, R., Morton, A., Yum, K., and J.
Babiarz, "A Two-Way Active Measurement Protocol (TWAMP)",
RFC 5357, DOI 10.17487/RFC5357, October 2008,
<http://www.rfc-editor.org/info/rfc5357>.

5.2. Informative References

[RFC5618] Morton, A. and K. Hedayat, "Mixed Security Mode for the
Two-Way Active Measurement Protocol (TWAMP)", RFC 5618,
DOI 10.17487/RFC5618, August 2009,
<http://www.rfc-editor.org/info/rfc5618>.

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[RFC7594] Eardley, P., Morton, A., Bagnulo, M., Burbridge, T.,
Aitken, P., and A. Akhter, "A Framework for Large-Scale
Measurement of Broadband Performance (LMAP)", RFC 7594,
DOI 10.17487/RFC7594, September 2015,
<http://www.rfc-editor.org/info/rfc7594>.

[RFC7717] Pentikousis, K., Ed., Zhang, E., and Y. Cui,
"IKEv2-Derived Shared Secret Key for the One-Way Active
Measurement Protocol (OWAMP) and Two-Way Active
Measurement Protocol (TWAMP)", RFC 7717,
DOI 10.17487/RFC7717, December 2015,
<http://www.rfc-editor.org/info/rfc7717>.

Acknowledgements

The author would like to thank Kostas Pentikousis, Nalini Elkins,
Mike Ackermann, and Greg Mirsky for insightful reviews and comments.
We thought Spencer Dawkins caught the last of the small errors in his
AD review, but Nevil Brownlee found a few more during OPS-DIR review.
Roni Even found our use of "IETF Consensus" was out of date with
[RFC5226]. Michelle Cotton helped to clarify the IANA
considerations.

Author's Address

Al Morton
AT&T Labs
200 Laurel Avenue South
Middletown,, NJ 07748
United States

Phone: +1 732 420 1571
Fax: +1 732 368 1192
Email: [email protected]
URI: http://home.comcast.net/~acmacm/

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