Network Working Group R. Mandeville Request for Comments: 2285 European Network Laboratories Category: Informational February 1998 Benchmarking Terminology for LAN Switching Devices Status of this Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (1998). All Rights Reserved. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Existing definitions . . . . . . . . . . . . . . . . . . . . . . 2 3. Term definitions . . . . . . . . . . . . . . . . . . . . . . . . 3 3.1 Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.1.1 Device under test (DUT) . . . . . . . . . . . . . . . . 3 3.1.2 System under test (SUT) . . . . . . . . . . . . . . . . 3 3.2 Traffic orientation. . . . . . . . . . . . . . . . . . . . . 4 3.2.1 Unidirectional traffic. . . . . . . . . . . . . . . . . 4 3.2.2 Bidirectional traffic . . . . . . . . . . . . . . . . . 5 3.3 Traffic distribution . . . . . . . . . . . . . . . . . . . . 6 3.3.1 Non-meshed traffic. . . . . . . . . . . . . . . . . . . 6 3.3.2 Partially meshed traffic. . . . . . . . . . . . . . . . 7 3.3.3 Fully meshed traffic. . . . . . . . . . . . . . . . . . 8 3.4 Bursts . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.4.1 Burst . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.4.2 Burst size . . . . . . . . . . . . . . . . . . . . . . 10 3.4.3 Inter-burst gap (IBG). . . . . . . . . . . . . . . . . 10 3.5 Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.5.1 Intended load (Iload) . . . . . . . . . . . . . . . . 11 3.5.2 Offered load (Oload) . . . . . . . . . . . . . . . . . 12 3.5.3 Maximum offered load (MOL) . . . . . . . . . . . . . . 13 3.5.4 Overloading . . . . . . . . . . . . . . . . . . . . . 14 3.6 Forwarding rates . . . . . . . . . . . . . . . . . . . . . 15 3.6.1 Forwarding rate (FR) . . . . . . . . . . . . . . . . . 15 3.6.2 Forwarding rate at maximum offered load (FRMOL). . . . 16 3.6.3 Maximum forwarding rate (MFR). . . . . . . . . . . . . 16 3.7 Congestion control . . . . . . . . . . . . . . . . . . . . 17 3.7.1 Backpressure . . . . . . . . . . . . . . . . . . . . . 17 3.7.2 Forward pressure . . . . . . . . . . . . . . . . . . . 18 Mandeville Informational