This tutorial trains an operator to use the basic IOS command line interface.
Trying 10.201.1.3... Connected to 10.201.1.3 (10.201.1.3). Escape character is '^]'. User Access Verification Username: lab Password: gateway>logout Connection closed by foreign host.
You can only telnet to a device if its network ports are operationally up.
Just like in the real world, this is only the case for each port, if its administrative status is up and its neighbor device is running (in the case of directly connected links). If you start the entire lab, all devices should satisfy this and you should be able to telnet into any of the devices. If you start just one device in the lab, you will likely not be able to telnet in.
But, each Cisco device in the lab also has Console access.
In most aspects the Telnet and console access will be the same, except most noteably in
We will use Telnet access and console access interchangeably throughout. If you are stuck at some point using telnet or console, switch to the other access method.
If you want to continue using this telnet window, you need to raise it again, eg. by clicking on its icon in the bottom taskbar of your window manager.
Of course, you can have multiple telnet sessions open to any device simulation, but just like in the real world, you can only have one console session open.
gateway>show ver Cisco Internetwork Operating System Software IOS (tm) 3000 Software (IGS-D-L), Version 11.0(14a), RELEASE SOFTWARE (fc1) Copyright (c) 1986-1997 by cisco Systems, Inc. Compiled Wed 02-Apr-97 19:23 by tlane Image text-base: 0x02005000, data-base: 0x025BD7B0 ROM: System Bootstrap, Version 11.0(10c), SOFTWARE ROM: 3000 Software (IGS-D-L), Version 11.0(14a), RELEASE SOFTWARE (fc1) c2524 uptime is 2 minutes System returned to ROM by power-on System image file is "flash:igs-d-l.110-14a" cisco 2524 (?) processor (revision J) with 14336K/512K bytes of memory. Processor board ID 05243987, with hardware revision 00000003 Bridging software. X.25 software, Version 3.0.0. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial(sync/async) network interface(s) System/IO memory with parity disabled 8192K bytes of DRAM onboard System running from RAM 31K bytes of non-volatile configuration memory. gateway>show host Default domain is not set Name/address lookup uses domain service Name servers are 255.255.255.255 Host Flag Age Type Address(es) gateway>show hist show ver show host show hist
gateway>show h % Ambiguous command "show h"
To resolve an ambiguous command:
gateway>show h? history hosts gateway>show h
gateway>? Exec commands: clear Reset functions disconnect Disconnect an existing network connection enable Turn on privileged commands exit Exit from the EXEC help Description of the interactive help system logout Exit from the EXEC ping Send echo messages show Show running system information systat Display information about terminal lines terminal Set terminal line parameters where List active connections
To see a list of available commands starting with "s":
gateway>s? show systat
To see the list of show commands:
gateway>show ? backup Backup status buffers Buffer pool statistics clock Display the system clock compress Show compression statistics dialer Dialer parameters and statistics flash: display information about flash: file system history Display the session command history hosts IP domain-name, lookup style, nameservers, and host table ip IP information location Display the system location modemcap Show Modem Capabilities database protocols Active network routing protocols snmp snmp statistics terminal Display terminal configuration parameters users Display information about terminal lines version System hardware and software status
To see the syntax of the show version command:
gateway>show version ? | Output modifiers
To use command completion type the Tab key:
gateway>show verTab gateway>show version
Use the left and right arrow keys to move within the line. This lets you correct typing mistakes, for example type
gateway>show vesion ^ % Invalid input detected at '^' marker.
Use the up arrow key to recall the previous command from history then correct the command.
gateway>enable Password: gateway# disable gateway>
gateway# configure terminal Enter configuration commands, one per line. End with CNTL/Z. gateway(config)# exit gateway#
gateway# configure terminal Enter configuration commands, one per line. End with CNTL/Z. gateway(config)# interface Serial0 gateway(config-if)# ^Z gateway# gateway# configure terminal Enter configuration commands, one per line. End with CNTL/Z. gateway(config)# interface Serial0 gateway(config-if)# exit gateway(config)# interface Serial0.1 gateway(config-if)# exit gateway(config)#
gateway(config)# banner login ! == my login banner == !
Trying 10.201.0.110... Connected to 10.201.0.110 (10.201.0.110). Escape character is '^]'. == my login banner == Username: lab Password: gateway>
gateway>enable Password: gateway# configure terminal Enter configuration commands, one per line. End with CNTL/Z. gateway(config)# line vty 0 gateway(config-line)# exit gateway(config)# line vty 0 gateway(config-line)# end gateway#
gateway# configure terminal Enter configuration commands, one per line. End with CNTL/Z. gateway(config)# no enable password gateway(config)# enable password mypassword gateway(config)# ^Z gateway# disable gateway>enable Password: gateway#
gateway# configure terminal Enter configuration commands, one per line. End with CNTL/Z. gateway(config)# banner motd * == my motd banner == * gateway(config)# end gateway# copy running-config startup-config Building configuration... [OK] gateway# show startup-config version 11.0 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname cisco-2524 ! boot system flash slot0: enable secret 5 $1$QjqB$fvfzb0yjJWpjLbRjoHOEF. ! ! ! ip subnet-zero ip cef ! ! ! ip ssh time-out 120 ip ssh authentication-retries 3 ! ! ! ! ! crypto mib ipsec flowmib history tunnel size 200 crypto mib ipsec flowmib history failure size 200 ! ! ! fax interface-type modem mta receive maximum-recipients 0 ! ! ! ! interface Ethernet0 ip address 10.1.120.1 255.255.254.0 ! interface Serial0