scope:

Introduction

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 [1], and follows closely the corresponding metric for One-way Delay ("A One-way Delay Metric for IPPM") [2]; the reader is assumed to be familiar with those documents.

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.