10 ContentsExternal power source only option 152Power sharing option 153Power Supply Unit (PSU) option 154Diagnosing and correcting PoE problems 155Messages 156Connecting the PSU 156Power management 157Configuring PoE using the CLI 158Set port power enable or disable 159Set port power priority 159Set power limit for channels 159Set traps control 160Show main power status 160Set power usage threshold 160Setting PoE detection method 161Show port power status 161Show port power measurement 161Viewing PoE ports using the JDM 162Configuring PoE using the JDM 163Configuring PoE using the Web-based Management Interface 163Configuring power management on the switch 163Configuring power management for the ports 165Switch administration tasks 169General switch administration using the Command Line Interface 169Multiple switch configurations 170Assigning and clearing IP addresses 171Assigning and clearing IP addresses for specific units 174Displaying Interfaces 175Setting port speed 176Enabling Autotopology 179Enabling flow control 180Enabling rate-limiting 183Using Simple Network Time Protocol 185Clock configuration 189Custom Autonegotiation Advertisements 189Connecting to Another Switch 190Domain Name Server (DNS) Configuration 192General Switch Administration using the Web-based Management Interface 194Viewing stack information 194Viewing summary switch information 196Changing stack numbering 197Identifying unit numbers 199Configuring BootP, IP, and gateway settings 200Nortel Ethernet Routing Switch 4500 SeriesOverview — System ConfigurationNN47205-500 02.01 Standard5.0 23 February 2007Copyright © 2007, Nortel Networks Nortel Networks Confidential.