130 About the Nortel Ethernet Routing Switch 4500 SeriesAgent Auto Unit ReplacementUse the enhancement to the Auto Unit Replacement functionality, knownas Agent Auto Unit Replacement (AAUR), to ensure that all units in a stackhave the same software image by inspecting units joining a stack anddownloading the stack software image to any unit that has a dissimilarimage. AAUR is enabled by default.Agent Auto Unit Replacement functions in the following manner:1. When a stand-alone switch joins an AAUR-enabled stack, the switchsoftware image is inspected.2. If the switch software image differs from the stack software image, theAAUR functionality downloads the stack software image to the joiningunit.3. The joining unit is then reset and becomes a member of the stack upona reboot.Use the CLI commands in the following sections to manage and configureAAUR. You can currently manage this functionality only through the CLI.stack auto-unit-replacement-image enable commandUse the stack auto-unit-replacement-image enable commandto enable AAUR. Because AAUR is enabled by default, use this commandonly if this functionality was previously disabled.The syntax for this command isstack auto-unit-replacement-image enableRun the stack auto-unit-replacement-image enable command inGlobal Configuration command mode.no stack auto-unit-replacement-image-enable commandUse the no stack auto-unit-replacement-image enablecommand to disable AAUR. Because AAUR is enabled by default, you mustrun this command if you do not want AAUR functionality on a switch.The syntax for this command isno stack auto-unit-replacement-image enableThe no stack auto-unit-replacement-image enable command isexecuted in the Global Configuration command mode.default stack auto-unit-replacement-image enable commandUse the default stack auto-unit-replacement-image enablecommand to set the AAUR functionality to the factory default of enabled.Nortel Ethernet Routing Switch 4500 SeriesOverview — System ConfigurationNN47205-500 02.01 Standard5.0 23 February 2007Copyright © 2007, Nortel Networks Nortel Networks Confidential.
