Differentiated Service Code Point and Explicit Congestion Notification Monitoring in the Two-Way Active Measurement Protocol (TWAMP)
RFC 7750
| Document | Type |
RFC - Proposed Standard
(February 2016; No errata)
Updates RFC 5357
|
|
|---|---|---|---|
| Last updated | 2016-02-02 | ||
| Replaces | draft-hedin-ippm-type-p-monitor | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Brian Trammell | ||
| Shepherd write-up | Show (last changed 2015-10-07) | ||
| IESG | IESG state | RFC 7750 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Spencer Dawkins | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) J. Hedin
Request for Comments: 7750 G. Mirsky
Updates: 5357 S. Baillargeon
Category: Standards Track Ericsson
ISSN: 2070-1721 February 2016
Differentiated Service Code Point and Explicit Congestion Notification
Monitoring in the Two-Way Active Measurement Protocol (TWAMP)
Abstract
This document describes an optional extension for Two-Way Active
Measurement Protocol (TWAMP) allowing the monitoring of the
Differentiated Service Code Point and Explicit Congestion
Notification fields with the TWAMP-Test protocol.
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/rfc7750.
Copyright Notice
Copyright (c) 2016 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.
Hedin, et al. Standards Track [Page 1]
RFC 7750 DSCP and ECN Monitoring in TWAMP February 2016
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions Used in This Document . . . . . . . . . . . . 3
1.1.1. Terminology . . . . . . . . . . . . . . . . . . . . . 3
1.1.2. Requirements Language . . . . . . . . . . . . . . . . 3
2. TWAMP Extensions . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Setting Up Connection to Monitor DSCP and ECN . . . . . . 3
2.2. TWAMP-Test Extension . . . . . . . . . . . . . . . . . . 4
2.2.1. Session-Reflector Packet Format for DSCP and ECN
Monitoring . . . . . . . . . . . . . . . . . . . . . 4
2.2.2. DSCP and ECN Monitoring with Extensions from RFC 6038 8
2.2.3. Consideration for TWAMP Light Mode . . . . . . . . . 8
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
4. Security Considerations . . . . . . . . . . . . . . . . . . . 9
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1. Normative References . . . . . . . . . . . . . . . . . . 9
5.2. Informative References . . . . . . . . . . . . . . . . . 10
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
The One-Way Active Measurement Protocol (OWAMP) [RFC4656] defines the
Type-P Descriptor field and negotiation of its value in the OWAMP-
Control protocol. The Two-Way Active Measurement Protocol (TWAMP)
[RFC5357] states that only a Differentiated Services Code Point
(DSCP) value (see [RFC2474], [RFC3168], and [RFC3260]) can be defined
by Type-P Descriptor, and the negotiated value must be used by both
the Session-Sender and Session-Reflector. The TWAMP specification
also states that the same DSCP value (found in the Session-Sender
packet) MUST be used in the test packet reflected by the Session-
Reflector. However, the TWAMP-Test protocol does not specify any
methods to determine or report when the DSCP value has changed or is
different than expected in the forward or reverse direction. Re-
marking the DSCP (changing its original value) in IP networks is
possible and often accomplished by a Differentiated Services policy
configured on a single node along the IP path. In many cases, a
change of the DSCP value indicates an unintentional or erroneous
behavior. At best, the Session-Sender can detect a change of the
DSCP reverse direction, assuming such a change is actually
detectable.
This document describes an OPTIONAL feature for TWAMP. It is called
DSCP and ECN Monitoring. It allows the Session-Sender to know the
actual DSCP value received at the Session-Reflector. Furthermore,
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