Basic CISCO Commands

 

access-enable	Enables the router to create a temporary access list entry in a dynamic access list.
access-group	Applies access control lists (ACLs) to an interface.
access-list	Defines a standard IP ACL.
access-template	Manually places a temporary access list entry on a router to which you are connected.
appn	Sends a command to the APPN subsystem.
atmsig	Executes ATM signaling commands.
b	Boots the operating system manually.
bandwidth	Sets a bandwidth value for an interface.
banner motd	Specifies a message-of-the-day banner.
bfe	Sets manual emergency modes.
boot system	Specifies the system image that the router loads at startup.
calendar	Manages the hardware calendar.
cd	Changes the current device.
cdp enable	Enables Cisco Discovery Protocol on an interface.
clear	Resets functions.
clear counters	Clears the interface counters.
clear interface	Resets the hardware logic on an interface.
clockrate	Configures the clock rate for the hardware connections on serial interfaces, such as network interface modules and interface processors to an acceptable bit rate.
cmt	Starts or stops FDDI connection management functions.
config-register	Changes the configuration register settings.
configure	Allows you to enter changes to an existing configuration and maintain and store configuration information at a central site.
configure memory	Loads configuration information from nonvolatile random-access memory.
configure terminal	Configures the terminal manually from the console terminal.
connect	Opens a terminal connection.
copy	Copies configuration or image data.
copy flash tftp	Copies the system image from Flash memory to a tftp server.
copy running-config startup-config	Stores the current configuration in RAM into NVRAM.
copy running-config tftp	Stores the current configuration in RAM on a network TFTP server.
copy tftp flash	Downloads a new image from tftp server to Flash memory.
copy tftp runnig-config	Loads configuration information from a network TFTP server.
debug	Uses debugging functions.
debug dialer	Shows such information as what number the interface is dialing.
debug ip rip	Displays RIP routing updates as they are sent and received.
debug ipx routing activity	Displays information about Routing Information Protocol (RIP) update packets.
debug ipx sap	Displays information about Service Advertising Protocol (SAP) update packets.
debug isdn q921	Displays data link-layer (Layer 2) access procedures that are taking place at the router on the D channel (LAPD) of its Integrated Services Digital Network (ISDN) interface.
debug ppp	Displays information on traffic and exchanges in an internetwork implementing Point-to-Point Protocol (PPP).
delete	Deletes a file.
deny	Sets the conditions for a named IP ACL.
dialer idle-timeout	Specifies the idle time before the line is disconnected.
dialer map	Configures a serial interface to call one or multiple sites.
dialer wait-for-carrier-time	Specifies how long to wait for a carrier.
dialer-group	Controls access by configuring an interface to belong to a specific dialing group.
dialer-list protocol	Defines a DDR dialer list to control dialing by protocol or by a combination of protocol and ACL.
dir	Lists the files on a given device.
disable	Turns off privileged commands.
disconnect	Disconnects an existing network connection.
enable	Turns on privileged commands.
enable password	Specifies a password to prevent unauthorized access to the router.
enable secret	Specifies an additional layer of security over the enable password command.
encapsulation frame-relay	Enables Frame Relay encapsulation.
encapsulation novell-ether	Specifies that Novell's unique frame format is used on a network segment.
encapsulation ppp	Sets PPP as the encapsulation method used by a serial or ISDN interface.
encapsulation sap	Specifies that Ethernet 802.2 frame format is used on a network segment. Cisco's keyword is sap.
end	Exits configuration mode.
erase	Erases Flash or configuration memory.
erase startup-config	Erases the content of NVRAM.
exec-timeout	Sets the interval that the EXEC command interpreter waits until user input is detected.
exit	Exits any configuration mode, or closes an active terminal session and terminates the EXEC.
format	Formats a device.
frame-relay local-dlci	Enables the Local Management Interface (LMI) mechanism for serial lines using Frame Relay encapsulation.
help	Gets a description of the interactive help system.
history	Enables the command history function.
hostname	Configures the router with a host name, which is used in prompts and default configuration filenames.
interface	Configures an interface type and enters interface configuration mode.
interface serial	Selects the interface and enters interface configuration mode.
ip access-group	Controls access to an interface.
ip address	Assigns an address and a subnet mask and starts IP processing on an interface.
ip default-network	Establishes a default route.
ip domain-lookup	Enables name-to-address translation in the router.
ip host	Makes a static name-to-address entry in the router's configuration file.
ip name-server	Specifies the addresses for up to six name servers to use for name and address resolution.
ip route	Establishes static routes.
ip unnumbered	Enables Internet Protocol (IP) processing on a serial interface without assigning an explicit IP address to the interface.
ipx delay	Sets the tick count.
ipx ipxwan	Enables the IPXWAN protocol on a serial interface.
ipx maximum-paths	Sets the number of equal-cost paths the Cisco IOS software uses when forwarding packets.
ipx network	Enables Internetwork Packet Exchange (IPX) routing on a particular interface and optionally selects the type of encapsulation (framing).
ipx router	Specifies the routing protocol to use.
ipx routing	Enables IPX routing.
ipx sap-interval	Configures less frequent SAP updates over slow links.
ipx type-20-input-checks	Restricts the acceptance of IPX type 20 propagation packet broadcasts.
isdn spid1	Defines at the router the service profile identifier (SPID) number that has been assigned by the ISDN service provider for the B1 channel.
isdn spid2	Defines at the router the SPID number that has been assigned by the ISDN service provider for the B2 channel.
isdn switch-type	Specifies the central office switch type on the ISDN interface.
keepalive	Enables the LMI mechanism for serial lines using Frame Relay encapsulation.
lat	Opens a LAT connection.
line	Identifies a specific line for configuration and starts the line configuration command collection mode.
line console	Configures a console port line.
line vty	Specifies a virtual terminal for remote console access.
lock	Locks the terminal.
login	Logs in as a particular user. Enables password checking at login.
logout	Exits from EXEC mode.
mbranch	Traces down a branch of a multicast tree for a specific group.
media-type	Specifies the physical connection.
metric holddown	Keeps new IGRP routing information from being used for a certain period of time.
mrbranch	Traces up a branch of a multicast tree for a specific group.
mrinfo	Requests neighbor and version information from a multicast router.
mstat	Shows statistics after multiple multicast traceroutes.
mtrace	Traces the path from a source to a destination branch for a multicast distribution tree.
name-connection	Names an existing network connection.
ncia	Starts/stops the NCIA server.
network	Assigns a Network Information Center-based address to which the router is directly connected.
network	Assigns a NIC-based address to which the router is directly connected. Associates networks with an IGRP routing process. Enables Enhanced IGRP on a network in IPX router configuration mode.
network-number	Specifies a directly connected network.
no shutdown	Restarts a disabled interface.
pad	Opens an X.29 PAD connection.
permit	Sets conditions for a named IP ACL.
ping	Sends an echo request; diagnoses basic network connectivity.
ping	Sends ICMP echo request packets to another node on the network. Checks host reachability and network connectivity. Diagnoses basic network connectivity.
ppp	Starts the IETF Point-to-Point Protocol.
ppp authentication	Enables Challenge Handshake Authentication Protocol (CHAP) or Password Authentication Protocol (PAP) or both, and specifies the order in which CHAP and PAP authentication are selected on the interface.
ppp chap hostname	Creates a pool of dialup routers that all appear to be the same host when authenticating with CHAP.
ppp chap password	Configures a password that will be sent to hosts that want to authenticate the router. This command limits the number of username/password entries in the router.
ppp pap sent-username	Enables remote PAP support for an interface and uses sent-username and password in the PAP authentication request packet to the peer.
protocol	Defines an IP routing protocol, which can be either RIP, Interior Gateway Routing Protocol (IGRP), Open Shortest Path First (OSPF), or Enhanced IGRP.
pwd	Displays current device.
reload	Halts and performs a cold reset; reloads the operating system.
rlogin	Opens an rlogin connection.
router	Starts a routing process by first defining an IP routing protocol. For example, router rip selects RIP as the routing protocol.
router igrp	Enables an IGRP routing process.
router rip	Selects RIP as the routing protocol.
rsh	Executes a remote command.
sdlc	Sends SDLC test frames.
send	Sends a message over tty lines.
service password-encryption	Enables the password encryption function.
setup	Enters the setup command facility.
show access-lists	Displays the contents of all current ACLs.
show buffers	Provides statistics for the buffer pools on the network server.
show cdp entry	Displays information about a neighbor device listed in the CDP table.
show cdp interface	Displays information about the interfaces on which CDP is enabled.
show cdp neighbors	Displays the results of the CDP discovery process.
show dialer	Displays general diagnostics for serial interfaces configured for DDR.
show flash	Displays the layout and content of Flash memory.
show frame-relay lmi	Displays statistics about the LMI.
show frame-relay map	Displays the current map entries and information about the connections.
show frame-relay pvc	Displays statistics about PVCs for Frame Relay interfaces.
show hosts	Displays a cached list of host names and addresses.
show interfaces	Displays statistics for all interfaces configured on the router or access server.
show interfaces serial	Displays information about a serial interface.
show ip interface	Displays the status and global parameters associated with an interface.
show ip interface	Lists a summary of an interface's IP information and status.
show ip protocols	Displays the parameters and current state of the active routing protocol process.
show ip route	Displays the contents of the IP routing table.
show ip route	Displays the current state of the routing table.
show ipx interface	Displays the status of the IPX interfaces configured in the Cisco IOS software and the parameters configured on each interface.
show ipx route	Displays the content of the IPX routing table.
show ipx servers	Displays the IPX server list.
show ipx traffic	Displays the number and type of packets.
show isdn active	Displays current call information, including called number, the time until the call is disconnected, AOC charging units used during the call, and whether the AOC information is provided during calls or at the end of calls.
show isdn status	Displays the status of all ISDN interfaces or, optionally, a specific digital signal link (DSL) or a specific ISDN interface.
show memory	Shows statistics about the router's memory, including memory-free pool statistics.
show processes	Displays information about the active processes.
show protocols	Displays the configured protocols. This command shows the status of any configured Layer 3 protocol.
show protocols	Displays the configured protocols.
show running-config	Displays the current configuration in RAM.
show spantree	Displays spanning-tree information for a virtual local-area network (VLAN).
show stacks	Monitors the stack use of processes and interrupt routines and displays the reason for the last system reboot.
show startup-config	Displays the saved configuration, which is the contents of NVRAM.
show status	Displays the current status of the ISDN line and both B channels.
show version	Displays the configuration of the system hardware, the software version, the names and sources of configuration files, and the boot images.
shutdown	Disables an interface.
telnet	Logs into a host that supports telnet.
term ip	Specifies the format of network masks for the current session.
term ip netmask-format	Specifies the format in which network masks are displayed in show command output.
timers basic	Controls how often IGRP sends updates.
trace	Determines a path that packets will take when traveling to their destination.
username password	Specifies the password to be used in CHAP caller identification and PAP.
verify	Verifies the checksum of a Flash file.
where	Lists active connections.
which-route	Does OSI route table lookup and displays results.
write	Writes the running configuration to memory, a network, or a terminal.
write erase	The erase startup-config command replaces this command.
write memory	The copy running-config startup-config command replaces this command.
x3	Sets X.3 parameters on PAD.
xremote	Enters XRemote mode.

en (enable) - enable mode
conf t (conf term) - config mode

2501 - to handle two T1's... needs to have minimum 4MB flash mem and 2MB DRAM for IP only
2501 - Enterprise needs to have minimum 8MB Flash and 6MB DRAM memory