Differentiated Service Code Point and Explicit Congestion Notification Monitoring in the Two-Way Active Measurement Protocol (TWAMP) (RFC7750)
Original Publication Date: 2016-Feb-01
Included in the Prior Art Database: 2016-Feb-08
Internet Society Requests For Comment (RFCs)
J. Hedin: AUTHOR [+3]
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.
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)
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.
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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...