This document supports Brocade Network OS v4.0 and documents RASLog messages that can help you diagnose and fix problems with a switch or network. The guide is organized alphabetically by module name. A module is a subsystem in the Network OS. Each module generates a set of numbered messages. For each message, this guide provides message text, message type, severity level, probable cause, and recommended action. There may be more than one cause and more than one recommended action for any given message. This guide discusses the most probable cause and typical action recommended.