OWAMP Registries: Registries for the One-Way Active Measurement Protocol (OWAMP)
The IANA registries that track new Mode bits and Control Command numbers for the One-Way Active Measurement Protocol.
Morton, A., "Registries for the One-Way Active Measurement Protocol (OWAMP)", RFC 7718, DOI 10.17487/RFC7718, December 2015, <https://www.rfc-editor.org/info/rfc7718>.
@misc{rfc7718,
series = {Request for Comments},
number = 7718,
howpublished = {RFC 7718},
publisher = {RFC Editor},
doi = {10.17487/RFC7718},
url = {https://www.rfc-editor.org/info/rfc7718},
author = {A. Morton},
title = {{Registries for the One-Way Active Measurement Protocol (OWAMP)}},
pagetotal = 7,
year = 2015,
month = dec,
} RFC text
Contents
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.
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].
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.
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].
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.
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>.
[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: acmorton@att.com
URI: http://home.comcast.net/~acmacm/
AI ELI5
On this page
§1Why OWAMP Needed Registries
The One-Way Active Measurement Protocol (OWAMP, RFC 4656) was prepared to support measurements of metrics from the IETF IP Performance Metrics (IPPM) working group. The Two-Way Active Measurement Protocol (TWAMP, RFC 5357) extends it. TWAMP drew wide review, which produced recommendations for new features, so a registry of features was set up for TWAMP.
No new features had been proposed for OWAMP until RFC 7717. This memo therefore establishes the needed OWAMP registries and updates RFC 4656.
The twin protocol already had a list of approved add-ons, but OWAMP did not. When someone finally wanted to add something, a list was needed.
§2Purpose and Scope
The memo describes and requests registries for future OWAMP extensions and supplies their initial contents. IANA already administers the TWAMP Parameters registry, and this request follows a similar form, with one exception that the text points out in the Modes registry: OWAMP-Modes entries are assigned by bit position and carry no separate value.
The memo sets up the lists and fills in the first lines, copying how the twin protocol's list was done.
§3How the Registries Are Managed
Both registries are small. The Command Number registry has a maximum of 256 values, and the Modes registry rests on only 32 bit positions, each conveying one feature. Because of this, and because OWAMP is an IETF protocol, both MUST be updated only by IETF Review as defined in RFC 5226: an RFC that documents the registry use and is approved by the IESG.
For the Modes registry, IANA SHOULD allocate monotonically increasing bit positions when requested.
There are only a few slots on each list, so a change needs a formal, approved document, and new bits are handed out in order.
§4The Control Command Number Registry
OWAMP-Control Command Numbers are carried in the first octet of OWAMP-Control-Client command messages, as in Section 3 of RFC 4656. The initial contents are: 0 Reserved, 1 Request-Session, 2 Start-Sessions, 3 Stop-Sessions, 4 Fetch-Sessions, 5 to 253 Unassigned, 254 Experimentation, and 255 Reserved.
Value 254 is the one experimental value currently assigned in this registry.
Each kind of request has a number. Some are used, a big block is empty, and one number is kept for people to try out ideas.
- 0Reserved — Reserved by RFC 7718.
- 1Request-Session — Defined in Section 3.5 of RFC 4656.
- 2Start-Sessions — Defined in Section 3.7 of RFC 4656.
- 3Stop-Sessions — Defined in Section 3.8 of RFC 4656.
- 4Fetch-Sessions — Defined in Section 3.9 of RFC 4656.
- 5-253Unassigned — Open for future IETF Review.
- 254Experimentation — The one experimental value.
- 255Reserved — Reserved by RFC 7718.
§5The OWAMP-Modes Registry
Modes appear in the Server Greeting and Set-up Response messages (Section 3.1 of RFC 4656). They are currently single bits in a 32-bit Modes field, though a more complex encoding may be used in future. The initial contents are bit 0 Unauthenticated, bit 1 Authenticated, bit 2 Encrypted, bit 3 Reserved, bit 4 IKEv2-derived Shared Secret Key (from RFC 7717), and bits 5 to 31 Unassigned. No experimental bit positions are assigned.
The Server sends the bit-wise OR of the modes it is willing to support. With no other features active, the 27 most significant bits MUST be zero. A client conforming to RFC 4656 MAY ignore the 29 most significant bits or MAY support features signalled there.
OWAMP and TWAMP mode registries may grow apart, so no effort is made to coordinate them except for Reserved bit 3, which stays available for a mixed security mode like the one in RFC 5618.
Think of 32 light switches, one per feature. The server flips on the switches for what it can do, and old clients just ignore switches they do not know.
- 0Unauthenticated — Defined in RFC 4656.
- 1Authenticated — Defined in RFC 4656.
- 2Encrypted — Defined in RFC 4656.
- 3Reserved — Kept for a possible mixed security mode.
- 4IKEv2-derived Shared Secret Key — Added by RFC 7717.
- 5-31Unassigned — Open for future IETF Review.
§6Security Considerations
Because the memo only documents the creation of registries, it raises no new security or privacy issues. The considerations for active measurement of live networks in RFC 4656 and RFC 5357 still apply, and privacy considerations for measurement systems are in RFC 7594.
Making a list does not open any new doors, so there is nothing new to guard. The old safety rules still count.