A Round-trip Delay Metric for IPPM (RFC2681)
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2005-May-22
Internet Society Requests For Comment (RFCs)
G. Almes: AUTHOR [+3]
This memo defines a metric for round-trip delay of packets across Internet paths. It builds on notions introduced and discussed in the IPPM Framework document, RFC 2330 , and follows closely the corresponding metric for One-way Delay ("A One-way Delay Metric for IPPM") ; the reader is assumed to be familiar with those documents.
Network Working Group G.
Request for Comments: 2681 S. Kalidindi
Category: Standards Track M. Zekauskas
Advanced Network & Services
A Round-trip Delay Metric for IPPM
Status of this Memo
specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (1999). All Rights Reserved.
defines a metric for round-trip delay of packets across
Internet paths. It builds on notions introduced and discussed in the
IPPM Framework document, RFC 2330 , and follows closely the
corresponding metric for One-way Delay ("A One-way Delay Metric for
IPPM") ; the reader is assumed to be familiar with those
The memo was largely
written by copying material from the One-way
Delay metric. The intention is that, where the two metrics are
similar, they will be described with similar or identical text, and
that where the two metrics differ, new or modified text will be used.
This memo is
intended to be parallel in structure to a future
companion document for Packet Loss.
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 .
Although RFC 2119 was written with protocols in mind, the key words
are used in this document for similar reasons. They are used to
ensure the results of measurements from two different implementations
are comparable, and to note instances when an implementation could
perturb the network.
Almes, et al. Standards Track [Page 1]
RFC 2681 Round-trip for Delay Metric for IPPM September 1999
The structure of the memo is as follows:
+ A 'singleton' analytic metric, called
will be introduced to measure a single observation of round-trip
+ Using this singleton metric, a 'sample',
Delay-Poisson-Stream, will be introduced to measure a sequence of