Using Cisco IOS Software

This chapter provides information to prepare you to configure a SPA interface processor (SIP) or shared port adapter (SPA) using the Cisco IOS software. It includes the following sections:

•Accessing the CLI Using a Switch Console

•Using Keyboard Shortcuts

•Using the History Buffer to Recall Commands

•Understanding Command Modes

•Getting Help

•Using the no and default Forms of Commands

•Saving Configuration Changes

•Filtering Output from the show and more Commands

•Finding Support Information for Platforms and Cisco Software Images

Accessing the CLI Using a Switch Console

The following sections describe how to access the command-line interface (CLI) using a directly-connected console or by using Telnet or a modem to obtain a remote console:

•Accessing the CLI Using a Directly-Connected Console

•Accessing the CLI from a Remote Console Using Telnet

•Accessing the CLI from a Remote Console Using a Modem

For more detailed information about configuring and accessing a switch through various services, refer to the Cisco IOS Terminal Services Configuration Guide and Cisco IOS Terminal Services Command Reference publications.

For more information about making the console cable connections, refer to the Catalyst 6500 Series Switch Module Installation Guide.

Accessing the CLI Using a Directly-Connected Console

This section describes how to connect to the console port on the switch and use the console interface to access the CLI.

The console port on a Catalyst 6500 Series switch is an EIA/TIA-232 asynchronous, serial connection with hardware flow control and an RJ-45 connector. The console port is located on the front panel of the supervisor engine, as shown in Figure 1-1 and Figure 1-2.

Figure 1-1 Supervisor Engine 720 Console Port Connector

Figure 1-2 Supervisor Engine 32 Console Port Connector

Connecting to the Console Port

Before you can use the console interface on the switch using a terminal or PC, you must perform the following steps:

Step 1 Configure your terminal emulation software with the following settings:

•9600 bits per second (bps)

•8 data bits

•No parity

•2 stop bits

Note These are the default serial communication parameters on the switch. For information about how to change the default settings to meet the requirements of your terminal or host, refer to the Cisco IOS Terminal Services Configuration Guide.

Step 2 Connect a terminal or PC to the console port using one of the following methods:

a. To connect to the console port using the cable and adapters provided in the accessory kit that shipped with your Catalyst 6500 Series switch:

–Place the console port mode switch in the in position (factory default).

–Connect to the port using the RJ-45-to-RJ-45 cable and RJ-45-to-DB-25 DTE adapter or using the RJ-45-to-DB-9 DTE adapter (labeled "Terminal").

b. To connect to the console port using a Catalyst 5000 family Supervisor Engine III console cable:

–Place the console port mode switch in the out position.

–Connect to the port using the Supervisor Engine III cable and the appropriate adapter for the terminal connection.

Using the Console Interface

To access the CLI using the console interface, complete the following steps:

Step 1 After you attach the terminal hardware to the console port on the switch and you configure your terminal emulation software with the proper settings, the following prompt appears: 

Press Return for Console prompt

 
   
 
    
   
 Step 2 Press Return to enter user EXEC configuration mode. The following prompt appears: 
 
    
   
 
    
Router>

 
   
 
    
   
 
    
 
   
 
    
   
 Step 3 From user EXEC configuration mode, enter the enable command as shown in the following example: 
 
    
   
 
    
Router> enable

 
   
 
    
   
 
    
 
   
 
    
   
 Step 4 At the password prompt, enter your system's password. (The following example shows entry of the password called "enablepass"): 
 
    
   
 
    
Password: enablepass

 
   
 
    
   
 
    
 
   
 
    
   
 Step 5 When your enable password is accepted, the privileged EXEC configuration mode prompt appears: 
 
    
   
 
    
Router#

 
   
 
    
   
 
    
 
   
 
    
   
 Step 6 You now have access to the CLI in privileged EXEC configuration mode and you can enter the necessary commands to complete your desired tasks. 
 
    
   
 Step 7 To exit the console session, enter the quit command as shown in the following example: 
 
    
   
 
    
Router# quit

 
   
 
    
   
 
    
 
   
 
   
 
    
     
    
    
   
 Accessing the CLI from a Remote Console Using Telnet 
 
    
   
 This section describes how to connect to the console interface on a switch using Telnet to access the CLI. 
 
     
    
   
 Preparing to Connect to the Switch Console Using Telnet 
 
    
   
 Before you can access the switch remotely using Telnet from a TCP/IP network, you need to configure the switch to support virtual terminal lines (vtys) using the line vty global configuration command. You also should configure the vty lines to require login and specify a password. 
 
   
 
     
   
 
   
 
    
   
 Note To prevent disabling login on the line, be careful that you specify a password with the password command when you configure the login line configuration command. If you are using authentication, authorization, and accounting (AAA), you should configure the login authentication line configuration command. To prevent disabling login on the line for AAA authentication when you configure a list with the login authentication command, you must also configure that list using the aaa authentication login global configuration command. For more information about AAA services, refer to the Cisco IOS Security Configuration Guide and Cisco IOS Security Command Reference publications. 
 
   
 
    
   
 In addition, before you can make a Telnet connection to the switch, you must have a valid host name for the switch or have an IP address configured on the switch. For more information about requirements for connecting to the switch using Telnet, information about customizing your Telnet services, and using Telnet key sequences, refer to the Cisco IOS Terminal Services Configuration Guide. 
 
     
    
   
 Using Telnet to Access a Console Interface 
 
    
   
 To access a console interface using Telnet, complete the following steps: 
 
   
 
    
   
 Step 1 From your terminal or PC, enter one of the following commands: 
 
    
   
 •connect host [port] [keyword] 
 
    
   
 •telnet host [port] [keyword] 
 
    
   
 In this syntax, host is the switch host name or an IP address, port is a decimal port number (23 is the default), and keyword is a supported keyword. For more information, refer to the Cisco IOS Terminal Services Command Reference. 
 
   
 
     
   
 
   
 
    
   
 Note If you are using an access server, then you will need to specify a valid port number such as telnet 172.20.52.40 2004, in addition to the host name or IP address. 
 
   
 
    
   
 The following example shows the telnet command to connect to the switch named router: 
 
    
   
 
    
unix_host% telnet router

 
   
 
    
   
 
    
Trying 172.20.52.40...

 
   
 
    
   
 
    
Connected to 172.20.52.40.

 
   
 
    
   
 
    
Escape character is '^]'.

 
   
 
    
   
 
    
unix_host% connect 

 
   
 
    
   
 
    
 
   
 
    
   
 Step 2 At the password prompt, enter your login password. The following example shows entry of the password called "mypass": 
 
    
   
 
    
 
   
 
    
   
 
    
User Access Verification

 
   
 
    
   
 
    
 
   
 
    
   
 
    
Password: mypass

 
   
 
   
 
     
   
 
   
 
    
   
 Note If no password has been configured, press Return. 
 
   
 
    
   
 Step 3 From user EXEC configuration mode, enter the enable command as shown in the following example: 
 
    
   
 
    
Router> enable

 
   
 
    
   
 
    
 
   
 
    
   
 Step 4 At the password prompt, enter your system's password. (The following example shows entry of the password called "enablepass"): 
 
    
   
 
    
Password: enablepass

 
   
 
    
   
 
    
 
   
 
    
   
 Step 5 When the enable password is accepted, the privileged EXEC configuration mode prompt appears: 
 
    
   
 
    
Router#

 
   
 
    
   
 
    
 
   
 
    
   
 Step 6 You now have access to the CLI in privileged EXEC configuration mode and you can enter the necessary commands to complete your desired tasks. 
 
    
   
 Step 7 To exit the Telnet session, use the exit or logout command as shown in the following example: 
 
    
   
 
    
Router# logout

 
   
 
    
   
 
    
 
   
 
   
 
    
     
    
    
   
 Accessing the CLI from a Remote Console Using a Modem 
 
    
   
 To access the switch remotely using a modem through an asynchronous connection, connect the modem to the console port. 
 
    
   
 The console port on a Catalyst 6500 Series switch is an EIA/TIA-232 asynchronous, serial connection with hardware flow control and an RJ-45 connector. The console port is located on the front panel of the supervisor engine, as shown in Figure 1-3 and Figure 1-4. 
 
    
    
   
 Figure 1-3 Supervisor Engine 720 Console Port Connector 
 
    
   
 
 
   
 
     
   
 
   
 
 
    
    
   
 Figure 1-4 Supervisor Engine 32 Console Port Connector 
 
    
   
 
 
   
 
     
   
 
   
 
 
    
   
 To connect a modem to the console port, place the console port mode switch in the in position. Connect to the port using the RJ-45-to-RJ-45 cable and the RJ-45-to-DB-25 DCE adapter (labeled "Modem"). 
 
     
    
    
   
 Using Keyboard Shortcuts 
 
    
    
    
   
 Commands are not case sensitive. You can abbreviate commands and parameters if the abbreviations contain enough letters to be different from any other currently available commands or parameters. 
 
    
   
 Table 1-1 lists the keyboard shortcuts for entering and editing commands. 
 
    
   
 
 
   
 
    
 
      
       
       
      
 Table 1-1 Keyboard Shortcuts  
 
      
      
      
 
        
        

          Keystrokes 
        
 		 
        
        

          Purpose 
        
 		 
      
 
      
 
       
 Ctrl-B or 
the Left Arrow key1  
 		 
       
 Move the cursor back one character 
 		 
      
 
      
 
       
 Ctrl-F or
the Right Arrow key1 
 		 
       
 Move the cursor forward one character 
 		 
      
 
      
 
       
 Ctrl-A 
 		 
       
 Move the cursor to the beginning of the command line 
 		 
      
 
      
 
       
 Ctrl-E 
 		 
       
 Move the cursor to the end of the command line 
 		 
      
 
      
 
       
 Esc B 
 		 
       
 Move the cursor back one word 
 		 
      
 
      
 
       
 Esc F 
 		 
       
 Move the cursor forward one word 
 		 
      
 
      
    
 
    
 
      
      
 
       
 1 The arrow keys function only on ANSI-compatible terminals such as VT100s. 
 		 
      
 
      
    
 
   
 
   
 
   
 
 
     
    
    
   
 Using the History Buffer to Recall Commands 
 
    
   
 The history buffer stores the last 20 commands you entered. History substitution allows you to access these commands without retyping them, by using special abbreviated commands. 
 
    
   
 Table 1-2 lists the history substitution commands. 
 
    
   
 
 
   
 
    
 
      
       
       
      
 Table 1-2 History Substitution Commands 
 
      
      
      
 
        
        

          Command 
        
 		 
        
        

          Purpose 
        
 		 
      
 
      
 
       
 Ctrl-P or the Up Arrow key1  
 		 
       
 Recall commands in the history buffer, beginning with the most recent command. Repeat the key sequence to recall successively older commands. 
 		 
      
 
      
 
       
 Ctrl-N or the Down Arrow key1 
 		 
       
 Return to more recent commands in the history buffer after recalling commands with Ctrl-P or the Up Arrow key. 
 		 
      
 
      
 
       
Router# show history 
 
       
 While in EXEC mode, list the last several commands you have just entered. 
 		 
      
 
      
    
 
    
 
      
      
 
       
 1 The arrow keys function only on ANSI-compatible terminals such as VT100s. 
 		 
      
 
      
    
 
   
 
   
 
   
 
 
     
    
    
    
   
 Understanding Command Modes 
 
    
   
 You use the CLI to access Cisco IOS software. Because the CLI is divided into many different modes, the commands available to you at any given time depend on the mode that you are currently in. Entering a question mark (?) at the CLI prompt allows you to obtain a list of commands available for each command mode. 
 
    
   
 When you log in to the CLI, you are in user EXEC mode. User EXEC mode contains only a limited subset of commands. To have access to all commands, you must enter privileged EXEC mode, normally by using a password. From privileged EXEC mode you can issue any EXEC command—user or privileged mode—or you can enter global configuration mode. Most EXEC commands are one-time commands. For example, show commands show important status information, and clear commands clear counters or interfaces. The EXEC commands are not saved when the software reboots. 
 
    
   
 Configuration modes allow you to make changes to the running configuration. If you later save the running configuration to the startup configuration, these changed commands are stored when the software is rebooted. To enter specific configuration modes, you must start at global configuration mode. From global configuration mode, you can enter interface configuration mode and a variety of other modes, such as protocol-specific modes. 
 
    
   
 ROM monitor mode is a separate mode used when the Cisco IOS software cannot load properly. If a valid software image is not found when the software boots or if the configuration file is corrupted at startup, the software might enter ROM monitor mode. 
 
    
   
 Table 1-3 describes how to access and exit various common command modes of the Cisco IOS software. It also shows examples of the prompts displayed for each mode. 
 
    
    
   
 
 
   
 
    
 
      
       
       
      
 Table 1-3 Accessing and Exiting Command Modes  
 
      
      
      
 
        
        

          Command Mode 
        
 		 
        
        

          Access Method 
        
 		 
        
        

            
        
  
        

          Prompt 
        
 		 
        
        

          Exit Method 
        
 		 
      
 
      
 
       
 User EXEC 
 		 
       
 Log in. 
 		 
        
        
 
         
Router>

 
        
 
       
 Use the logout command. 
 		 
      
 
      
 
       
 Privileged EXEC 
 		 
       
 From user EXEC mode, use the enable EXEC command. 
 		 
        
        
 
         
Router#

 
        
 
       
 To return to user EXEC mode, use the disable command. 
 		 
      
 
      
 
       
 Global configuration 
 		 
       
 From privileged EXEC mode, use the configure terminal privileged EXEC command. 
 		 
        
        
 
         
Router(config)#

 
        
 
       
 To return to privileged EXEC mode from global configuration mode, use the exit or end command. 
 		 
      
 
      
 
       
 Interface configuration 
 		 
       
 From global configuration mode, specify an interface using an interface command. 
 		 
        
        
 
         
Router(config-if)#

 
        
 
       
 To return to global configuration mode, use the exit command. 
 
 To return to privileged EXEC mode, use the end command. 
 		 
      
 
      
 
       
 ROM monitor 
 		 
       
 From privileged EXEC mode, use the reload EXEC command. Press the Break key during the first 60 seconds while the system is booting. 
 		 
        
        
 
         
>

 
        
 
       
 To exit ROM monitor mode, use the continue command. 
 		 
      
 
      
    
 
   
 
   
 
   
 
 
    
   
 For more information on command modes, refer to the "Using the Command-Line Interface" chapter in the Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2. 
 
     
    
    
   
 Getting Help 
 
    
   
 Entering a question mark (?) at the CLI prompt displays a list of commands available for each command mode. You can also get a list of keywords and arguments associated with any command by using the context-sensitive help feature. 
 
    
   
 To get help specific to a command mode, a command, a keyword, or an argument, use one of the following commands: 
 
    
   
 
 
   
 
    
 
      
       
      
 Table 1-4 Help Commands and Purpose 
 
 
      
      
      
 
        
        

          Command 
        
 		 
        
        

          Purpose 
        
 		 
      
 
      
 
        
        
 
         
help

 
        
 
       
 Provides a brief description of the help system in any command mode. 
 		 
      
 
      
 
        
        
 
         
abbreviated-command-entry?

 
        
 
       
 Provides a list of commands that begin with a particular character string. (No space between command and question mark.) 
 		 
      
 
      
 
        
        
 
         
abbreviated-command-entry<Tab>

 
        
 
       
 Completes a partial command name. 
 		 
      
 
      
 
        
        
 
         
?

 
        
 
       
 Lists all commands available for a particular command mode. 
 		 
      
 
      
 
        
        
 
         
command ?

 
        
 
       
 Lists the keywords or arguments that you must enter next on the command line. (Space between command and question mark.) 
 		 
      
 
      
    
 
   
 
   
 
   
 
 
     
    
    
   
 Finding Command Options Example 
 
    
   
 This section provides an example of how to display syntax for a command. The syntax can consist of optional or required keywords and arguments. To display keywords and arguments for a command, enter a question mark (?) at the configuration prompt or after entering part of a command followed by a space. The Cisco IOS software displays a list and brief description of available keywords and arguments. For example, if you were in global configuration mode and wanted to see all the keywords or arguments for the arap command, you would type arap ?. 
 
    
    
   
 The <cr> symbol in command help output stands for "carriage return." On older keyboards, the carriage return key is the Return key. On most modern keyboards, the carriage return key is the Enter key. The <cr> symbol at the end of command help output indicates that you have the option to press Enter to complete the command and that the arguments and keywords in the list preceding the <cr> symbol are optional. The <cr> symbol by itself indicates that no more arguments or keywords are available and that you must press Enter to complete the command. 
 
    
   
 Table 1-5 shows examples of how you can use the question mark (?) to assist you in entering commands. 
 
    
    
    
   
 
 
   
 
    
 
      
       
       
      
 Table 1-5 Finding Command Options  
 
      
      
      
 
        
        

          Command 
        
 		 
        
        

          Comment 
        
 		 
      
 
      
 
        
        
 
         
Router> enable

 
        
 
        
 
         
Password: <password>

 
        
 
        
 
         
Router# 

 
        
 
       
 Enter the enable command and password to access privileged EXEC commands. You are in privileged EXEC mode when the prompt changes to a "#" from the ">"; for example, Router> to Router#. 
 		 
      
 
      
 
        
        
 
         
Router# configure terminal

 
        
 
        
 
         
Enter configuration commands, one per line. End with CNTL/Z.

 
        
 
        
 
         
Router(config)#

 
        
 
       
 Enter the configure terminal privileged EXEC command to enter global configuration mode. You are in global configuration mode when the prompt changes to Router(config)#. 
 		 
      
 
      
 
        
        
 
         
Router(config)# interface serial ?

 
        
 
        
 
         
  <0-6>     Serial interface number

 
        
 
        
 
         
Router(config)# interface serial 4 ?

 
        
 
        
 
         
  /

 
        
 
        
 
         
Router(config)# interface serial 4/ ?

 
        
 
        
 
         
  <0-3>     Serial interface number

 
        
 
        
 
         
Router(config)# interface serial 4/0 ?

 
        
 
        
 
         
<cr>

 
        
 
        
 
         
Router(config)# interface serial 4/0

 
        
 
        
 
         
Router(config-if)#

 
        
 
       
 Enter interface configuration mode by specifying the serial interface that you want to configure using the interface serial global configuration command. 
 
 Enter ? to display what you must enter next on the command line. In this example, you must enter the serial interface slot number and port number, separated by a forward slash. 
 
 When the <cr> symbol is displayed, you can press Enter to complete the command. 
 
 You are in interface configuration mode when the prompt changes to Router(config-if #. 
 		 
      
 
      
 
        
        
 
         
Router(config-if)# ?

 
        
 
        
 
         
Interface configuration commands:

 
        
 
        
 
         
  .

 
        
 
        
 
         
  .

 
        
 
        
 
         
  .

 
        
 
        
 
         
  ip                  Interface Internet Protocol config commands

 
        
 
        
 
         
  keepalive           Enable keepalive

 
        
 
        
 
         
  lan-name            LAN Name command

 
        
 
        
 
         
  llc2                LLC2 Interface Subcommands

 
        
 
        
 
         
  load-interval       Specify interval for load calculation for an

 
        
 
        
 
         
                      interface

 
        
 
        
 
         
  locaddr-priority    Assign a priority group

 
        
 
        
 
         
  logging             Configure logging for interface

 
        
 
        
 
         
  loopback            Configure internal loopback on an interface

 
        
 
        
 
         
  mac-address         Manually set interface MAC address

 
        
 
        
 
         
  mls                 mls router sub/interface commands

 
        
 
        
 
         
  mpoa                MPOA interface configuration commands

 
        
 
        
 
         
  mtu                 Set the interface Maximum Transmission Unit (MTU)

 
        
 
        
 
         
  netbios             Use a defined NETBIOS access list or enable

 
        
 
        
 
         
                      name-caching

 
        
 
        
 
         
  no                  Negate a command or set its defaults

 
        
 
        
 
         
  nrzi-encoding       Enable use of NRZI encoding

 
        
 
        
 
         
  ntp                 Configure NTP

 
        
 
        
 
         
  .

 
        
 
        
 
         
  .

 
        
 
        
 
         
  .

 
        
 
        
 
         
Router(config-if)#

 
        
 
       
 Enter ? to display a list of all the interface configuration commands available for the serial interface. This example shows only some of the available interface configuration commands. 
 		 
      
 
      
 
        
        
 
         
Router(config-if)# ip ?

 
        
 
        
 
         
Interface IP configuration subcommands:

 
        
 
        
 
         
  access-group        Specify access control for packets

 
        
 
        
 
         
  accounting          Enable IP accounting on this interface

 
        
 
        
 
         
  address             Set the IP address of an interface

 
        
 
        
 
         
  authentication      authentication subcommands

 
        
 
        
 
         
  bandwidth-percent   Set EIGRP bandwidth limit

 
        
 
        
 
         
  broadcast-address   Set the broadcast address of an interface

 
        
 
        
 
         
  cgmp                Enable/disable CGMP

 
        
 
        
 
         
  directed-broadcast  Enable forwarding of directed broadcasts

 
        
 
        
 
         
  dvmrp               DVMRP interface commands

 
        
 
        
 
         
  hello-interval      Configures IP-EIGRP hello interval

 
        
 
        
 
         
  helper-address      Specify a destination address for UDP broadcasts

 
        
 
        
 
         
  hold-time           Configures IP-EIGRP hold time

 
        
 
        
 
         
  .

 
        
 
        
 
         
  .

 
        
 
        
 
         
  .

 
        
 
        
 
         
Router(config-if)# ip

 
        
 
       
 Enter the command that you want to configure for the interface. This example uses the ip command. 
 
 Enter ? to display what you must enter next on the command line. This example shows only some of the available interface IP configuration commands. 
 		 
      
 
      
 
        
        
 
         
Router(config-if)# ip address ?

 
        
 
        
 
         
  A.B.C.D             IP address

 
        
 
        
 
         
  negotiated          IP Address negotiated over PPP

 
        
 
        
 
         
Router(config-if)# ip address

 
        
 
       
 Enter the command that you want to configure for the interface. This example uses the ip address command. 
 
 Enter ? to display what you must enter next on the command line. In this example, you must enter an IP address or the negotiated keyword. 
 
 A carriage return (<cr>) is not displayed; therefore, you must enter additional keywords or arguments to complete the command. 
 		 
      
 
      
 
        
        
 
         
Router(config-if)# ip address 172.16.0.1 ?

 
        
 
        
 
         
  A.B.C.D             IP subnet mask

 
        
 
        
 
         
Router(config-if)# ip address 172.16.0.1

 
        
 
       
 Enter the keyword or argument that you want to use. This example uses the 172.16.0.1 IP address. 
 
 Enter ? to display what you must enter next on the command line. In this example, you must enter an IP subnet mask. 
 
 A <cr> is not displayed; therefore, you must enter additional keywords or arguments to complete the command. 
 		 
      
 
      
 
        
        
 
         
Router(config-if)# ip address 172.16.0.1 255.255.255.0 ?

 
        
 
        
 
         
  secondary           Make this IP address a secondary address

 
        
 
        
 
         
  <cr>

 
        
 
        
 
         
Router(config-if)# ip address 172.16.0.1 255.255.255.0

 
        
 
       
 Enter the IP subnet mask. This example uses the 255.255.255.0 IP subnet mask. 
 
 Enter ? to display what you must enter next on the command line. In this example, you can enter the secondary keyword, or you can press Enter. 
 
 A <cr> is displayed; you can press Enter to complete the command, or you can enter another keyword. 
 		 
      
 
      
 
        
        
 
         
Router(config-if)# ip address 172.16.0.1 255.255.255.0

 
        
 
        
 
         
Router(config-if)#

 
        
 
       
 In this example, Enter is pressed to complete the command. 
 		 
      
 
      
    
 
   
 
   
 
   
 
 
     
    
    
    
   
 Using the no and default Forms of Commands 
 
    
   
 Almost every configuration command has a no form. In general, use the no form to disable a function. Use the command without the no keyword to re-enable a disabled function or to enable a function that is disabled by default. For example, IP routing is enabled by default. To disable IP routing, use the no ip routing command; to re-enable IP routing, use the ip routing command. The Cisco IOS software command reference publications provide the complete syntax for the configuration commands and describe what the no form of a command does. 
 
    
   
 Many CLI commands also have a default form. By issuing the command default command-name, you can configure the command to its default setting. The Cisco IOS software command reference publications describe the function of the default form of the command when the default form performs a different function than the plain and no forms of the command. To see what default commands are available on your system, enter default ? in the appropriate command mode. 
 
     
    
    
    
   
 Saving Configuration Changes 
 
    
   
 Use the copy running-config startup-config command to save your configuration changes to the startup configuration so that the changes will not be lost if the software reloads or a power outage occurs. For example: 
 
    
   
 
    
Router# copy running-config startup-config

 
   
 
    
   
 
    
Building configuration...

 
   
 
    
   
 
    
 
   
 
    
   
 It might take a minute or two to save the configuration. After the configuration has been saved, the following output appears: 
 
    
   
 
    
[OK]

 
   
 
    
   
 
    
Router#

 
   
 
    
   
 
    
 
   
 
    
   
 On most platforms, this task saves the configuration to NVRAM. On the Class A Flash file system platforms, this task saves the configuration to the location specified by the CONFIG_FILE environment variable. The CONFIG_FILE variable defaults to NVRAM. 
 
     
    
    
    
   
 Filtering Output from the show and more Commands 
 
    
   
 You can search and filter the output of show and more commands. This functionality is useful if you need to sort through large amounts of output or if you want to exclude output that you need not see. 
 
    
   
 To use this functionality, enter a show or more command followed by the "pipe" character (|); one of the keywords begin, include, or exclude; and a regular expression on which you want to search or filter (the expression is case sensitive): 
 
    
   
 show command | {begin | include | exclude} regular-expression 
 
    
   
 The output matches certain lines of information in the configuration file. The following example illustrates how to use output modifiers with the show interface command when you want the output to include only lines in which the expression "protocol" appears: 
 
    
   
 
    
Router# show interface | include protocol

 
   
 
    
   
 
    
 
   
 
    
   
 
    
FastEthernet0/0 is up, line protocol is up

 
   
 
    
   
 
    
Serial4/0 is up, line protocol is up

 
   
 
    
   
 
    
Serial4/1 is up, line protocol is up

 
   
 
    
   
 
    
Serial4/2 is administratively down, line protocol is down

 
   
 
    
   
 
    
Serial4/3 is administratively down, line protocol is down

 
   
 
    
   
 
    
 
   
 
    
   
 For more information on the search and filter functionality, refer to the "Using the Command-Line Interface" chapter in the Cisco IOS Configuration Fundamentals and Network Management Configuration Guide. 
 
     
    
    
    
   
 Finding Support Information for Platforms and Cisco Software Images 
 
    
   
 Cisco IOS software is packaged in feature sets consisting of software images that support specific platforms. The feature sets available for a specific platform depend on which Cisco IOS software images are included in a release. To identify the set of software images available in a specific release or to find out if a feature is available in a given Cisco IOS software image, you can use Cisco Feature Navigator or the software release notes. 
 
     
    
    
   
 Using Cisco Feature Navigator 
 
    
   
 Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear. 
 
     
    
   
 Using Software Advisor 
 
    
   
 To see if a feature is supported by a Cisco IOS release, to locate the software document for that feature, or to check the minimum software requirements of Cisco IOS software with the hardware installed on your switch, Cisco maintains the Software Advisor tool on Cisco.com at http://tools.cisco.com/Support/Fusion/FusionHome.do 
 
    
   
 You must be a registered user on Cisco.com to access this tool. 
 
     
    
    
    
   
 Using Software Release Notes 
 
    
   
 Cisco IOS software releases include release notes that provide the following information: 
 
    
   
 •Platform support information 
 
    
   
 •Memory recommendations 
 
    
   
 •New feature information 
 
    
   
 •Open and resolved severity 1 and 2 caveats for all platforms 
 
    
   
 Release notes are intended to be release-specific for the most current release, and the information provided in these documents may not be cumulative in providing information about features that first appeared in previous releases. Refer to Cisco Feature Navigator for cumulative feature information.