Electromagnetic immunity | Nortel Networks 2500 Series specs

378Appendix E Technical speciﬁcations

•EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6, EN61000-4-8, EN61000-4-11

Electromagnetic immunity

The Ethernet Routing Switch 2500 Series meets the EN50082-1:1997 standard.

Nortel Ethernet Routing Switch 2500 Series

Overview — System Conﬁguration

NN47215-500 (323162-B) 02.02 Standard

4.1 19 November 2007

Copyright © 2007, Nortel Networks

Image 378

Nortel Networks 2500 Series manual Electromagnetic immunity

Contents

Overview System Conﬁguration Trademarks Restricted rights legendStatement of conditions Nortel Networks software license agreement GeneralPage Contents System conﬁguration software features Getting Started with Device Manager 101 Using the Web-based management interface 145 System conﬁguration using the CLI 177 Copyright 2007, Nortel Networks Ethernet port management using the CLI 233 Conﬁguring ports using Device Manager 303 Troubleshooting 337 Contents New in this release FeaturesConﬁguring daylight savings time using the device manager Other changes New in this release Text conventions IntroductionBefore you begin This guide uses the following text conventions Introduction Bold body text Related publications Protocols menu Getting help from the Nortel web site How to get helpGetting help over the phone from a Nortel Solutions Center Getting help through a Nortel distributor or reseller How to get help Introduction Ethernet Routing Switch 2500 Series hardware Front panel Ethernet Routing Switch 2550T-PWR Ethernet Routing Switch 2526T front panel Console port SFP Gbic Support on the Ethernet Routing Switch 2500 Series Port connectorsGigabit Interface Converter Auto-MDI/MDI-X LED display panel PWR Back panel Kensington lockLabel Type Color State Meaning AC power receptacle Cooling fans Country/Plug Specifications Typical plug Description Read immediatelyBitte sofort lesen Lisez ceci immédiatement Leggere attentamenteSírvase leer inmediatamente Avertissement Small ofﬁce desktop switch application Network conﬁguration examples Branch ofﬁce workgroup switch application Ethernet Routing Switch 2500 Series used as a desktop switch Medium sized ofﬁce wiring closet switch application Conﬁguring power workgroups and a wiring closet switch Conﬁguring power workgroups and a wiring closet switch Ethernet Routing Switch 2500 Series hardware Nortel Ethernet Routing Switch 2500 Series stacking Stacking capabilities Stack enabled switches Stacking functionality deliveryStandalone conﬁguration with license ﬁles Working with license ﬁles using the CLI Syntax for the copy tftp license command is Copying the license ﬁle using the Java Device Manager Show license all command output Step Action Following table describes the ﬁelds on the License Download License DownloadLicense Download page ﬁelds Fields Description To set up a stack, do the following Stack conﬁguration Show rear-ports mode command Conﬁguring the operational mode on rear ports using the CLIRear-ports mode command Rear-ports mode command Show rear-ports mode command Rear ports and stacking Unit Select switchShow rear-ports mode command output Rear panel components Connecting stack cables Cascade Down portCascade Up port Stack conﬁgurations Initial stack installationStack MAC address Base Unit Cascade Cable Cascade Cable used for return Cascade down stack conﬁguration Temporary base unit Regardless of stack conﬁguration, the following appliesCascade up stack conﬁguration Redundant cascade stacking Removing a stack unit Adding/Replacing a stack unitRedundant cascade stacking Auto Unit Replacement AUR function CFG mirror image process CFG mirror process in stack CFG mirror images in the stack after adding unit CFG mirror images after removing unit Restoring a CFG image CFG mirror images in the stack after removing the BU unit Step Action Syntax for this command is Conﬁguring AUR using the CLIShow stack auto-unit-replacement command Synchronizing the CFG mirror images with CFG images Stack auto-unit-replacement enable command No stack auto-unit-replacement enable commandDefault stack auto-unit-replacement enable command Conﬁguring AUR using Device Manager Displaying unit stack uptime Nortel Ethernet Routing Switch 2500 Series stacking System conﬁguration software features Switch management featuresConﬁguration and switch management User name and password Console port settingsSwitch banner Login banner Login screen Logging Autosave feature Using Sntp Setting local time zone Using DNS to ping and TelnetConﬁguring with CLI BootP automatic IP conﬁguration/MAC address Choosing a BootP request mode BootP or Last Address BootP or Default IPBootP Always BootP or Default IP BootP Always BootP or Last Address Default BootP setting BootP DisabledBootP or Last Address Flash memory storage Switch software image storage Conﬁguration File Download/Upload RequirementsBinary conﬁguration ﬁle Ascii conﬁguration ﬁle Autotopology Link Layer Discovery Protocol Ieee 802.1ab Lldp operational modes Connectivity and management informationHow Lldp works System conﬁguration software features Autosensing and autonegotiation Ethernet port management featuresConﬁguring Lldp using the CLI Custom Autonegotiation Advertisements Symmetric mode High speed ﬂow control Rate Limiting Conﬁguration Other featuresAsymmetric mode RFCs Standards CLI Basics CLI command modes Command mode prompts and entrance/exit commands CLI command mode hierarchy Interface FastEthern Port numbering in Standalone Mode Port numbering Accessing CLI Ethernet Routing Switch 2500 Series bannerPress Ctrl+Y, and the CLI prompt appears Setting the system username and password Getting helpBasic navigation General navigation commands End command Exit command Reload command Shutdown commandKeystroke navigation Help command Logout command No commandDefault command Help command output Interface command Enable commandConﬁgure command Conﬁgure command parameters and variables Exit command Disable commandEnd command Syntax for the end command is Reload command Exit command has no parameters or variables Shutdown command Shutdown command parameters and variables Managing basic system information Show sys-info commandShow sys-info command Show tech command Parameters Description Variables Show tech command Show sys-info command outputShow tech command output Show mac-address-table command Managing MAC address forwarding database table Mac-address-table aging-time command Default mac-address-table aging-time commandShow mac-address-table command output CLI Basics Installing Device Manager Installing Device Manager Device Manager basicsGetting Started with Device Manager Installing JDM on Windows JDM installation precautionsInstalling the Device Manager software Installing JDM on Windows Installing JDM on Unix or Linux Windows minimum requirements Removing previous versions of JDM on Windows Installing JDM on Windows from the CD Installing JDM on Windows from the webTo access the JDM software from the installation CD Executing the JDM installation software on Windows InstallAnywhere Introduction dialog box Choose Install Set dialog box Click NextLicense Agreement dialog box Feature Sets dialog box Choose Install Folder dialog box Click Next Choose Shortcut Folder dialog box appearsChoose Shortcut Folder dialog box Pre-Installation Summary dialog box Installing JDM on Unix or Linux Install Complete dialog box Installing JDM on Solaris from the CD Installing JDM on Linux from the CDMinimum requirements Installing JDM on Unix or Linux from the web Executing the JDM installation software on Unix or Linux Click Next Choose Install Set dialog box appears Do one of the following Feature Sets dialog box Pre-Installation Summary dialog box appears Installing Java Device Manager dialog box Removing JDM in Unix or Linux environments Device Manager basics Starting Device Manager Setting the Device Manager properties Device Manager window Following table describes the Properties dialog box ﬁelds Default Properties dialog boxType information and select check boxes Click OK Properties dialog box ﬁelds Area Web Management Area Field DescriptionPolling Application Control Application Launch Telnet To display the device view, use the following procedureOpening a device From JDM Press Ctrl+O Open Device dialog box appears Following table describes the Open Device dialog box ﬁelds Click Open Field Description SNMPv3 Device Manager window Device viewParts of the Device Manager window Menu bar Use the menu bar to set up and operate the Device ManagerMenu bar commands page 127 describes the Menu Bar commands Toolbar Device view Selecting objectsToolbar buttons Button Name Description Menu bar equivalent Viewing information about a Gbic port Selecting a single objectSelecting multiple objects To select a single object LEDs and ports Interface tab Port color codes Color Description Switch unit shortcut menuShortcut menus Color port legend Switch unit shortcut menu command Command Description Port shortcut menu commands Command DescriptionPort shortcut menu Status bar Using the buttons in Device Manager dialog boxesEditing objects Device Manager buttons Button Name Description Working with statistics and graphs Types of statisticsTypes of statistics Statistic Description Types of graphs Statistic DescriptionLine graph Area graph Bar graph Statistics for single and multiple objects Pie graphInterface statistics for a single port Viewing statistics as graphs Types of statistics Viewing statistics as graphsInterface statistics for multiple ports Statistics dialog box for a port Telnet session Opening an SSH connection to the deviceGraph dialog box buttons Button Name Description Opening the web-based management home Trap log Web-based management home Help ﬁle locations Platform Default path Online Help Getting Started with Device Manager Using the Web-based management interface Requirements Logging in to the web-based management interface Web-based management interface home Menu MenuMain headings and options Main menu titles Option Main menu titles Option Adac Management Menu icons Button or icon Description Console Viewing stack information To view stack informationIcons Name Description Stack Information Stack Information screen ﬁelds Section Fields Description Viewing summary information Switch InformationSwitch Information page ﬁelds Description Section Fields Description Changing stack numbering To view or renumber devices within the stack frameworkStack Numbering Identifying unit numbers Stack Numbering screen ﬁelds Field Range Description Identifying Unit Numbers 157 Poe poe-pd-detect-type command Diagnosing and correcting PoE problemsConﬁguring PoE switch parameters using the CLI Status codes on PoE ports Poe poe-power-usage-threshold command Legacy No poe-trap command Conﬁguring PoE port parameters using the CLIPoe poe-trap command No poe-shutdown command No poe-shutdown command Poe poe-shutdown commandNo poe-shutdown command parameters and variables Syntax for the poe poe-prioritycommand is Poe poe-priority commandPoe poe-shutdown command parameters and variables Poe poe-priority command parameters and variables Poe poe-limit command Poe poe-limit command parameters and variablesSets the port priority as Displaying PoE conﬁguration using the CLI Show poe-main-status command Show poe-port-status command Show poe-port-status command parameters and variables Enter the ports for which you want to display Show poe-power-measurement commandShow poe-port-status command output Status Power measurements Conﬁguring PoE using web-based managementDisplaying and conﬁguring power management for the switch Show poe-power-measurement command output Global Power Management Displaying and conﬁguring power management for the switchDisplaying and conﬁguring power management for the ports Global Power Management page items Description End Following table describes the items on the Port Property Displaying and conﬁguring power management for the portsPort Property page appears Port Property Port Property Description PoE tab for a single unit Edit Unit dialog box-PoE tab for a single unit PoE tab items for a single unit Description Device Manager display for PoE ports ERS 2550T-PWR with PoE ports PoE tab for ports Color DescriptionEdit Port dialog box- PoE tab PoE tab items PoE tab items page 176 describes the PoE tab itemsPoE tab items Description System conﬁguration using the CLI IP notation Ip address command Ip address command parameters and variablesAssigning and clearing IP addresses Default ip netmask command Default ip address commandNo ip address command No ip netmask command Ip default-gateway command No ip default-gateway commandIp default-gateway command parameters and variables Default ip default-gateway command Show ip command Show ip command output Show ip address commandShow ip address command parameters and variables Show ip address command output Ping command Ping command is executed in the User Exec command modePinging Show ip dns command Ping command Ip name-server command Resetting the switch to default conﬁgurationUsing DNS to ping and telnet Ping command responses Show ip dns command Show ip dns command output Ip name-server command There is no default value for this command Ip name-server command parameters and variables No ip name-server commandIp domain-name command No ip name-server command parameters and variables Conﬁgure network command No ip domain-name commandDefault ip domain-name command Conﬁguration Management Configure network command is executed in the User Exec mode Conﬁgure network commandShow conﬁg-network command Conﬁgure network command parameters and variables Show conﬁg-network command Show conﬁg-network command output Show running-conﬁg commandShow running-conﬁg command Copy running-conﬁg tftp command Ascii Conﬁguration Generator Copy running-conﬁg tftp command Show running-conﬁg command output Terminal command Setting the terminalShow terminal command Show terminal command Terminal command Terminal command parameters and variables Show cli commandTerminal command is executed in the User Exec mode Show cli command is executed in the User Exec command mode Syntax for the show sys-infocommand is Show cli command outputDisplaying system information Ip bootp server command Setting boot parametersBoot command Ip bootp server command parameters and variables No ip bootp server command Default ip bootp server commandSetting Tftp parameters Copy conﬁg tftp command Copy tftp conﬁg command Show tftp-server commandTftp-server command Tftp-server command parameters and variables Copy conﬁg tftp command No tftp-server commandDefault tftp-server command Copy conﬁg tftp command parameters and variables Copy tftp conﬁg command Copy tftp conﬁg command parameters and variablesCustomizing the opening banner Show banner command parameters and variables Banner command for displaying bannerShow banner command Describes the parameters for the banner command Show interfaces command Show interfaces conﬁg command No banner commandShow interfaces command Displaying the ARP table Show interfaces command parameters and variables Show interfaces names command outputShow interfaces command output Show interfaces conﬁg command Show interfaces verbose command output Show interfaces conﬁg command output Copy conﬁg nvram commandWrite memory command Saving the conﬁguration to Nvram Save conﬁg command Show autosave commandEnabling and disabling autosave Default autosave enable command Autosave enable commandNo autosave enable command Show autosave command has no parameters or variables Show sntp command Sntp server primary address command Sntp enable commandNo sntp enable command Show sntp command output Default is Sntp server secondary address commandNo sntp server command No sntp server command parameters and variables Syntax for the sntp sync-nowcommand is Sntp sync-now commandSntp sync-interval command Sntp sync-interval command parameters and variables Default sntp command parameters and variables Setting local time zoneDefault sntp command Clock time-zone No clock time-zone Clock summer-time No clock time-zone Clock time-zone command parameters and variablesClock time-zone Clock summer-time Clock summer-time command parameters and variables No clock summer-timeShow clock time-zone Show clock summer-time Autotopology command No autotopology commandEnabling Autopology Show clock time-zone output Default autotopology command Autotopology commandNo autotopology command Show autotopology settings Show autotopology nmm-table command output Conﬁguring Lldp using the CLIShow autotopology settings command output Show autotopology nmm-table Lldp command 32768 Default lldp command parameters and variables Default lldp commandLldp conﬁg-notiﬁcation command Lldp conﬁg-notiﬁcation command parameters and variables No lldp conﬁg-notiﬁcation command Default lldp conﬁg-notiﬁcation commandSpecifies the ports affected by the command Lldp tx-tlv command parameters and variables Lldp tx-tlv commandNo lldp tx-tlv command No lldp tx-tlv command parameters and variables Default lldp tx-tlv command Lldp status commandDefault lldp tx-tlv command parameters and variables Lldp status command parameters and variables No lldp status commandDefault lldp status command No lldp status command parameters and variables Show lldp command is executed in the User Exec command mode Show lldp commandDefault lldp status command parameters and variables Show lldp command parameters and variables Show lldp local-sys-data command output Show lldp mgmt-sys-data command output Show lldp port command Show lldp port command parameters and variablesShow lldp stats command output Show lldp port neighbor command output Show lldp port neighbor-mgmt-addr command output Show lldp port rx-stats command output Show lldp port tx-stats command output Show lldp port tx-tlv command output Conﬁguring LEDs to blink on the display panelUpgrading software Syntax for the download command is Download commandDownload command Download command parameters and variables Download message System conﬁguration using the CLI Shutdown command for the port No shutdown command Ethernet port management usingShutdown command for the port Shutdown port command parameters and variables No shutdown command No shutdown command parameters and variablesShutdown port command output Name command Name command No name command Default name commandNaming ports No name command parameters and variables No name commandDefault name command Default name command parameters and variables Setting port speed Speed command Default speed command Default speed command parameters and variables Duplex command Default duplex command ﬂowcontrol command parameters and variables ﬂowcontrol commandDefault duplex command parameters and variables Enabling ﬂow control No ﬂowcontrol command No ﬂowcontrol command parameters and variables Default ﬂowcontrol command Default ﬂowconrtol command parameters and variablesEnabling rate-limiting Rate-limit command parameters and variables Show rate-limit commandRate-limit command Show rate-limit command output No rate-limit command Default rate-limit commandEnabling Custom Autonegotiation Advertisements Cana Show auto-negotiation-advertisements command output Show auto-negotiation-advertisements commandShow auto-negotiation-capabilities command Enter ports for which you want the current Auto-negotiation-advertisements command No auto-negotiation-advertisements command Default auto-negotiation-advertisements command Enter ports for which you want to set default Conﬁguring the switch using Device Manager Viewing Unit information Rate Limit tab To open the Rate Limit tab, use the following procedureUnit tab To open the Unit tab Following table describes the Rate Limit tab ﬁelds Rate Limit tabRate Limit tab ﬁelds Field Description Following table describes the Rear Port Mode tab items Rear Ports Mode tabRearPortOperMode Globals tab Viewing switch IP informationTo open the Globals tab, use the following procedure Following table describes the Globals tab ﬁelds Globals tab ﬁelds Field and MIB Description Association Addresses tabFollowing table describes the Address tab ﬁelds Edit IP dialog box IP Address tab Edit IP dialog box ARP tab ARP tabFollowing table describes the ARP tab ﬁelds ARP tab ﬁelds Field Description TCP tab TCP tabFollowing table describes the TCP tab ﬁelds TCP tab ﬁelds Field Description TCP Connections tab UDP Listeners tabTCP Connections tab ﬁelds Field Description Editing the chassis conﬁguration UDP Listeners tab ﬁelds Field Description System tab Edit Chassis dialog box System tab Following table describes the System tab ﬁelds System tab ﬁelds Field Description Base Unit Info tab Following table describes the Base Unit Info tab ﬁelds Base Unit Info tab ﬁelds Field Description Edit Chassis screen-Stack Info tab Value is 4th flr wiring closet in blg aStack Info tab Stack Info tab ﬁelds Field Description 264 Conﬁguring the switch using Device Manager Agent tab Following table describes the Agent tab ﬁelds Edit Chassis dialog box Agent tabAgent tab ﬁelds Field Description Edit Chassis dialog box PowerSupply tab PowerSupply tabFollowing table describes the PowerSupply tab ﬁelds Power Supply tab ﬁelds Field Description Fan tab Following table describes the Fan tab ﬁeldsEdit Chassis dialog box Fan tab Banner tab Edit Chassis dialog box Banner tab To check that the banner is disabled To set the default banner, use the following procedureTo disable the banner Telnet window with default banner To create a Custom Banner, use the following procedure Custom Banner tabEdit Chassis dialog box Custom Banner tab FileSystem Conﬁg/Image/Diag ﬁle dialog box ﬁelds Working with conﬁguration ﬁlesFileSystem dialog box FileSystem Conﬁg/Image/Diag File tab dialog box Ascii conﬁg ﬁle Save Conﬁguration tab File system Ascii Conﬁg File dialog boxAscii Conﬁg File tab ﬁelds Field Description Following table describes the Save Conﬁguration tab ﬁelds Save Conﬁg tabSave Conﬁguration tab ﬁelds Field Description Working with Sntp Conﬁguring SntpSNTPClock dialog box Following table describes the Sntp dialog box ﬁelds SNTPClock dialog box ﬁelds Field Description Conﬁguring local time zone using the device manager Conﬁguring daylight savings time using the device manager Topology tab Displaying topology information using Device ManagerTo view topology information, use the following procedure Topology tab Topology Table tab Diagnostics dialog box Topology tab Topology Table tabTopology tab ﬁelds Field Description Following table describes the Topology Table tab ﬁelds Conﬁguring Lldp using Device ManagerDiagnostics dialog box Topology Table tab Lldp Globals tab Lldp Globals tab Lldp dialog box appears with the Globals tab displayedLldp Globals tab Lldp Globals tab ﬁelds Field Description 284 Conﬁguring the switch using Device Manager Port tab Click the Port tab. The Port tab appears Following table describes the Port tab ﬁeldsPort tab ﬁelds Field Description TX Stats tab TX Stats tab Graphing Lldp transmit statisticsFollowing table describes the TX Stats tab ﬁelds TX Stats tab ﬁelds Field Description RX Stats tab Following table describes the RX Stats tab ﬁeldsRX Stats tab ﬁelds Field Description 290 Conﬁguring the switch using Device Manager Graphing Lldp receive statistics Local System tabLocal System tab appears Local System tab Local Port tabFollowing table describes the Local System tab ﬁelds Local System tab ﬁelds Field Description Following table describes the Local Port tab ﬁelds Local Port tab ﬁelds Field Description Local Management tab Local Management tabFollowing table describes the Local Management tab ﬁelds Local Management tab ﬁelds Field Description Neighbor tab Following table describes the Neighbor tab ﬁelds Neighbor tab ﬁelds Field Description Neighbor Mgmt Address tab Neighbor Mgmt Address tab Neighbor Mgmt Address tab ﬁelds Field Description Unknown TLV tab Unknown TLV tabFollowing table describes the Unknown TLV tab ﬁelds Unknown TLV tab ﬁelds Field Description Organizational Deﬁned Info tab Organizational Deﬁned Info tabOrganizational Deﬁned Info tab ﬁelds Field Description Field Description 302 Conﬁguring the switch using Device Manager Conﬁguring ports using Device Manager Viewing and editing a single port conﬁguration Interface tab for a single port Interface tab ﬁelds Interface tab ﬁeldsPort dialog box Interface tab Interface tab ﬁelds for a single port Field Description Viewing and editing multiple port conﬁgurations To view or edit the conﬁgurations of multiple ports Interface tab for multiple ports Interface tab for multiple ports Interface tab ﬁelds for multiple ports Field Description 310 Conﬁguring ports using Device Manager Administering the switch using web-based management Administrative options available to you areViewing system information Quick Start System InformationSystem Information page items Description Quick Start Conﬁguring system security Items on the Quick Start Section Description Reset warning message displays Rebooting the Ethernet Routing Switch 2500 SeriesFrom the main menu, choose Administration Reset Reset page message Reset to Default page message Logging out of the management interface Logout message Administering the switch using web-based management Conﬁguring the switch using web-based management Conﬁguring BootP, IP, and gateway settingsSwitch conﬁguration options available to you are Following table describes the items on the IP IP page items Section Range Description Conﬁguring BootP, IP, and gateway settings Section Range Description Modifying system settings To conﬁgure system settings, use the following procedure System page items Range Description Conﬁguring switch port status Type information in the text boxes Click SubmitRange Description Following table describes the items on the Port Management Port Management Port row of your choice, select from the lists Click Submit Conﬁguring high speed ﬂow control High Speed Flow ControlHigh Speed Flow Control page items Range Description Downloading switch images To download a switch image, use the following procedureSoftware Download Following table describes the ﬁelds on the Software Download Software Download page ﬁelds Fields Range Description Downloading Ascii conﬁguration ﬁles 100 Mb/s port status LEDs ports 18 to Ascii Conﬁguration ﬁle download Ascii Conﬁguration ﬁle download page items Description Conﬁguration File Setting items Range Description Type information in the text boxes, or select from a list Parameters not saved to the conﬁguration ﬁle Conﬁguring port communication speed From the main menu, choose Conﬁguration Console/Comm PortConsole/Communication Port page items Conﬁguring Rate Limiting Conﬁguring Rate LimitingSelect from the list Following table describes the items on the Rate Limiting Rate LimitingRate Limiting page items Section Description Interpreting the LEDs Diagnosing and correcting problems TroubleshootingDiagnosing and correcting problems Normal power-up sequence Port connection problems Normal power-up sequence Port connection problems Corrective actions Symptom Probable causeAutonegotiation modes Port interface Appendix a DB-9 RS-232-D Console/Comm Port connector DB-9 Console port connector Pin number Signal Ring indicator not used Appendix B Default settings Factory default settings Field Default setting Field Default setting Pvid Packet Type Both Snooping Disabled Field Default setting Field Default setting Field Default setting Appendix B Default settings Appendix C Sample BootP conﬁguration ﬁle Appendix C Sample BootP conﬁguration ﬁle Appendix D Command List CLI command list Command Security Configuration and Management Nortel Ethernet Routing Switch Default tftp-server command Configuration IP Multicast NN47215-503 Ip default-gateway command No autosave enable command No banner command No logging remote level No snmp-server No tftp-server command Save config command Show banner command Show poe-port-status command Show running-config command Show terminal command Show tftp-server command Snmp-server host host-ip port Spanning-tree mstp max-hop 100 Terminal command Vlan create Appendix D Command List Appendix E Technical speciﬁcations AC power speciﬁcationsParameter Operating specification Storage specification Environmental speciﬁcations Physical dimensions Performance speciﬁcationsNetwork protocol and standards compatibility Safety agency certiﬁcation Electromagnetic emissions Electromagnetic immunity Index Index 132 Eeprom Gbic No autotopology command Viewing 129 No banner command Index Index 181 Sntp 68, 68, 208 Software version requirements Unix Index Index Page Overview System Conﬁguration