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Thread: Router Commands Overview

  1. #1
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    Router Commands Overview

    In this Article you will learn about the router commands, configurations, privileged mode commands, routing protocols, cisco labs and network configurations.
    There are hundreds of basic and advance level commands of a router. It is not easy to remember all the commands. But some commands are frequently used and can be remembered with some practice. I have provided a list of the most commonly used commands based on their features and usage.
    You will find here some basic terminology of a router.
    Routing: Routing is a process of moving the data (packets) through an inter network. Routing performs the two basic tasks. Define the paths for a packet and then forward the packets on the basis of defined paths. Routing can also be defined as the communication between two or more logically and physical networks and this communication (packet transfer) is brought by a router.
    First of all you should remember the keyboard shortcuts of a router.

    Keyboard Shortcuts

    CTRL-N - show next command
    CTRL-P - show previous command
    SHIFT-CTRL-6 – Break


    Configuring the Router

    You will be able to learn the basic commands for configuring a router.

    sh running-config - details the running configuration file (RAM)
    sh startup-config - displays the configuration stored in NVRAM
    setup - Will start the the automatic setup; the same as when you first boot the router
    config t - use to execute configuration commands from the terminal
    config mem - executes configuration commands stored in NVRAM; copies startup-config to running-config
    config net - used to retrieve configuration info from a TFTP server
    copy running-config startup-config - copies saved config in running config (RAM) to NVRAM or "write memory" for IOS under ver.11
    copy startup-config running-config - copies from non-volatile (NVRAM) to current running config (RAM)
    boot system flash <put> - tells router which IOS file in flash to boot from
    boot system tftp - tells router which IOS file on the tftp server to boot from
    boot system rom - tell router to boot from ROM at next boot
    copy flash tftp - Copies flash to tftp server
    copy tftp flash - Restores flash from tftp server
    copy run tftp - Copies the current running-config to tftp server
    copy tftp run - Restores the running-config from tftp server

    General Commands

    Here is a list of the general commands. These are the basic level commands and most commonly used

    no shutdown - (enables the interface)
    reload - restarts the router
    sh ver - Cisco IOS version, uptime of router, how the router started, where system was loaded from, the interfaces the POST found, and the configuration register
    sh clock - shows date and time on router
    sh history - shows the history of your commands
    sh debug - shows all debugging that is currently enabled
    no debug all - turns off all debugging
    sh users - shows users connected to router
    sh protocols - shows which protocols are configured
    banner motd # Your customized message here # - Set/change banner
    hostname <give> - use to configure the hostname of the router
    clear counters - clear interface counters
    Privileged Mode commands of a router
    Learn how to work in the privileged mode of a router.
    enable - get to privileged mode
    disable - get to user mode
    enable password <give> - sets privileged mode password
    enable secret <give> - sets encrypted privileged mode password
    Setting Passwords on router
    Here you will be able to learn how to set the password on a router.
    enable secret <give> - set encrypted password for privileged access
    enable password <give> - set password for privileged access (used when there is no enable secret and when using older software)

    Setting the password for console access:

    (config)#line console 0
    (config-line)#password <put>
    Set password for virtual terminal (telnet) access (password must be set to access router through telnet):
    (config)#line vty 0 4
    (config-line)#password <put>
    Set password for auxiliary (modem) access:
    (config)#line aux 0
    (config-line)#password <put>
    Router Processes & Statistics
    By these command you can see the statistics and different processes of the router.
    sh processes - shows active processes running on router
    sh process cpu - shows cpu statistics
    sh mem - shows memory statistics
    sh flash - describes the flash memory and displays the size of files and the amount of free flash memory
    sh buffers - displays statistics for router buffer pools; shows the size of the Small, Middle, Big, Very Big, Large and Huge Buffers
    sh stacks - shows reason for last reboot, monitors the stack use of processes and interrupts routines
    IP Commands
    Here is a list of the IP Commands
    Configure IP on an interface:
    int serial 0
    ip address
    int eth 0
    ip address 2008.1.1.4
    Other IP Commands:
    sh ip route - view ip routing table
    ip route <remote_network> <mask> <default_gateway> [administrative_distance] - configure a static IP route
    ip route <put> - sets default gateway
    ip classless - use with static routing to allow packets destined for unrecognized subnets to use the best possible route
    sh arp - view arp cache; shows MAC address of connected routers
    ip address secondary - configure a 2nd ip address on an interface
    sh ip protocol
    CDP Commands (Cisco Discovery Protocol uses layer 2 multicast over a SNAP-capable link to send data):
    sh cdp neighbor - shows directly connected neighbors
    sh cdp int - shows which interfaces are running CDP
    sh cdp int eth 0/0 - show CDP info for specific interface
    sh cdp entry <cdp> - shows CDP neighbor detail
    cdp timer 120 - change how often CDP info is sent (default cdp timer is 60)
    cp holdtime 240 - how long to wait before removing a CDP neighbor (default CDP holdtime is 180)
    sh cdp run - shows if CDP turned on
    no cdp run - turns off CDP for entire router (global config)
    no cdp enable - turns off CDP on specific interface
    IPX Commands
    Enable IPX on router:
    ipx routing
    Configure IPX + IPX-RIP on an int:
    int ser 0
    ipx network 4A
    Other Commands:
    sh ipx route - shows IPX routing table
    sh ipx int e0 - shows ipx address on int
    sh ipx servers - shows SAP table
    sh ipx traffic - view traffic statistics
    debug ipx routing activity - debugs IPS RIP packets
    debug ipx sap - debugs SAP packets
    Routing Protocols
    RIP, IGPR and OSPF are the routing protocols and here is a list of the commands for the working on the routing protocols.
    Configure RIP:
    router rip
    Other RIP Commands:
    debug ip rip - view RIP debugging info
    Configure IGRP:
    router IGRP 200
    Other IGRP Commands:
    debug ip igrp events - view IGRP debugging info
    debug ip igrp transactions - view IGRP debugging info
    Access Lists
    Here is a list of the Access list command of a router.
    sh ip int ser 0 - use to view which IP access lists are applies to which int
    sh ipx int ser 0 - use to view which IPX access lists are applies to which int
    sh appletalk int ser 0 - use to view which AppleTalk access lists are applies to which int
    View access lists:
    sh access-lists
    sh ip access-lists
    sh ipx access-lists
    sh appletalk access-lists
    Apply standard IP access list to int eth 0:
    access-list 1 deny
    access-list 1 permit any
    int eth 0
    ip access-group 1 in
    Apply Extended IP access list to int eth 0:
    access-list 100 deny tcp host host eq 23
    access-list 100 deny tcp any eq 80
    int eth 0
    ip access-group 100 out
    Apply Standard IPX access list to int eth 0:
    access-list 800 deny 7a 8000
    access-list 800 permit -1
    int eth 0
    ipx access-group 800 out
    Apply Standard IPX access list to int eth 0:
    access-list 900 deny sap any 3378 -1
    access-list 900 permit sap any all -1
    int eth 0
    ipx access-group 900 out
    Wan Configurations Commands
    Networking over WAN is the main functionality of a router. The most common use of a router is for the WAN connectivity. Here is a list of the commands for the different methods of the WAN connectivity.
    PPP Configuration
    Point to point protocol is a method for the WAN connectivity and you will find here some commands of PPP.
    encapsulation pppppp authentication <chap>
    ppp chap hostname <put>
    ppp pap sent-username <put>
    sh int ser 0 - use to view encapsulation on the interface
    Frame-Relay Configuration
    One of the methods for the WAN connectivity is the Frame Relay. Find here some basic commands for the WAN connectivity through Frame Relay.
    encapsulation frame-relay ietf - use IETF when setting up a frame-relay network between a Ciscorouter and a non-Cisco router
    frame-relay lmi-type ansi - LMI types are Cisco, ANSI, Q933A; Cisco is the default; LMI type is auto-sensed in IOS v11.2 and up
    frame-relay map ip 100 broadcast - if inverse ARP won't work, map Other IP to Your DLCI # (local)
    keep alive 10 - use to set keep alive
    sh int ser 0 - use to show DLCI, LMI, and encapsulation info
    sh frame-relay pvc - shows the configured DLCI's; shows PVC traffic stats
    sh frame-relay map - shows route mapssh frame-relay lmi - shows LMI info
    Miscellaneous Commands
    In the last but not least here is a list of the some miscellaneous and useful commands
    sh controller t1 - shows status of T1 lines
    sh controller serial 1 - use to determine if DCE or DTE device
    (config-if)#clock rate 6400 - set clock on DCE (bits per second)
    (config-if)#bandwidth 64 - set bandwidth (kilobits)

  2. #2
    tooo long..>!>>!>1

  3. #3
    Senior Member Array
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    hi shalin...ya bcoz almost full info abt router confg i think so...

  4. #4
    yes i know ...

  5. #5
    hey where shall v execute all the commands?

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