CISCO Router BASIC Commands

Router Commands

Router Name> User executable mode, view but can’t make changes
Router Name> enable Gets you to Privilege mode allowing you to make changes to the router
Router Name # Privilege mode, changes can now be made to router
Router Name # disable To get back to user mode
Router Name # exit To exit router
Router Name # shft+ctrl+6 Break Key
Router Name # write erase To clear all previous configurations
Router Name # reload Reboot the router
Router Name # setup Setup command brings up the configuration dialog box.
Router Name # sh ? shows parameters supported by the router
Router Name # sh int shows status of all interfaces
Router Name # sh int s0 shows status of interface you selected, ie: s0, s1, e0, e1, ...
Router Name # sh ip int view ip parameters
Router Name # sh ip int brief brief summary of all interfaces and status
Router Name # sh ip route shows networks available to interface and routing table
Router Name # sh proc cpu shows CPU utilization on router
Router Name # sh mem shows memory utilization
Router Name # sh mem big to see the largest blocks of memory
Router Name # sh log to check recent history of router
Router Name # sh version shows summary of hardware and reason for last reload
Router Name # sh diag shows more detailed hardware information
Router Name # sh flash shows IOS file
Router Name # sh run shows running configurations on router ( version 10.3 and above )
Router Name # wr t shows running configurations on router (version 10.3 below/above)
Router Name # sh env all shows current router temps, power supply and general health of router
Router Name # sh env table shows warning levels for shutdown to take place
Router Name # sh startup-config shows saved config in NVRAM
Router Name # sh controllers(int) shows serial line configurations. Make sure a space is used for int. ie: s 0
Router Name # sh cdp neighbor shows directly connected neighbors
Router Name # sh cdp neighbors detail shows detail of directly connected devices: (router, bridge, switch)
Router Name # sh cdp int shows which interfaces are running CDP
Router Name # sh arp shows lan devices and mac address' ( arp table )
Router Name # sh ip arp shows the arp table in the router
Router Name # sh protocol shows which protocols are configured
Router Name # sh ip protocol shows routing protocol configured and parameters
Router Name # sh ip route isis displays all routes in the route table that originated in ISIS
Router Name # sh isis spf-log displays information on the duration/cause of recent SPF runs
Router Name # sh isis database displays all information known by ISIS
Router Name # sh isis database detail … displays contents of entire LSP (add router info, hr1.lga2.00-00)
Router Name # sh isis topology summary of best path from router to every other router
Router Name # sh ip bgp lists all routes learned from bgp
Router Name # sh ip bgp < route> shows BGP information for that particular route, use w/ sh ip rou
Router Name #sh ip bgp community-list add list # to end of string. Bgp routes that match a given list
Router Name # sh ip bgp filter-list bgp routes that match a given AS path filter list
Router Name # sh ip bgp neigh(address) shows the details on a route in the route table
Router Name # sh ip bgp sum used to view the status of a BGP session
Router Name # sh route-map (name) show the details of a specific route-map
Router Name # sh adjacency detail adjacency table used by CEF. Verify router/device is discovered
Router Name # sh ip cef to view the CEF cache or FIB (forwarding information base) table
Router Name # sh ip cef summary gives an overview of the cef entries
Router Name # sh cef not-cef-switched if CEF is enabled, this will show packets not being CEF switched
Router Name # sh standby displays the information on the operation of HSRP
Router Name # sh standby brief displays a summary of interfaces running HSRP
Router Name # sh standby (interface) displays state of the port, hello intervals, MAC address, config
R# sh mpls traffic-eng tunnels tunnel # displays tunnels between hops in a route masked by MPLS

Switch Commands

Switch1> ? responds with main help menu
Switch1> hist to view a listing of previous commands used
Switch1> show ? responds with various show commands
Switch1> show ver information about IOS and hardware components
Switch1> show module quick view of status on all modules
Switch1> show port provides general summary of all ports: errors, collisions, speed, duplex
Switch1> show port (#) specific information for a individual port
Switch1> show port status provides single line general summary of all ports
Switch1> show mac (port#) summary information on what has been sent and received on a given port
Switch1> show test (module#) if a module is in failed status, show test will show specifics
Switch1> show log shows history of switch on a per module basis
Switch1> show config shows configurations on switch
Switch1> show system shows uptime and levels of utilization
Switch1> show vlan lists the VLAN's that are resident on the switch
Switch1> show cam lists the LAN switch transparent bridging table
Switch1> sh cam (mac address) to locate a single MAC address
Switch1> show cam dynamic lists all dynamically learned MAC addresses
Switch1> show span lists info on a port listening/diagnostics feature (switched port analyzer)
Switch1> show spantree (port#) allows you to see the spantree status of a specific port
Switch1> show trunk provides a summary of the ports in trunking mode

To Enable A Port

Router Name# config t

Router Name# int (+ interface you are designating, token ring must put in ring speed 16 or 4)

Router Name# ip address _._._._ (mask)

Router Name# no shut

To Disable A Port

Router Name# int (interface or port)

Router Name# shut

To Enable A Protocol

Different protocols will have different instructions below is a generic example:

Router Name# config t

Router Name# router (protocol type + any extensions needed in instructions)

Router Name# network (+ IP address)

To Disable A Protocol

Router Name# config t

Router Name# no router (+ protocol type)

To Change Router Name

Router Name# config t

Router Name# hostname Jim (global command)

Router Name# ctrl z

From Config T settings:

Router Name# ctrl z (to save settings and execute the command)

Router Name# ctrl c (starts over, abort)

Router Name# write mem (saves everything to NV Ram)

Router Name# write t (shows running configurations, also can use show run)

Router Name# telnet (to telnet into another router)

Router Name# ip host name (name & address - To Build Host Table - Global Command)

Router Name# no host (to remove a host name) * On a 4000 series router you must specify what type of media is being used:

Router Name# config t

Router Name# int (+ interface you plan to configure, ie: e0, s0, ... screen changes, major command)

Router Name# media-type 10baseT (or whichever media is being used, sub command)

To Enable RIP

Router Name# config t

Router Name# router rip

Router Name# network (+ network address, ie: 150.111.0.0 )

Router Name# int (+ interface you plan to configure, ie: e0, s0, ... screen changes)

Config-if# ip address 150.11.1.1 255.255.255.0 (full statement with subnet mask, sub command)

Config-if# no shut (this logically activates the interface, required at every interface configuration)

To Enable SNMP

Router Name# config t

Router Name# snmp server community public (RO, RW)

To Enable IPX (Novell)

Router Name# config t

Router Name# ipx routing

Router Name# int (+ interface you plan to configure, ie: e0, s0, ... screen changes)

Router Name# ipx network (ipx address)

Router Name # sh ipx servers shows ipx servers on the network

Router Name # sh ipx route shows ipx networks seen by the routers

Router Name # sh ipx traffic shows ipx related protocols

Router Name # sh ipx int view ipx address on an interface

To Enable VTY

Router Name# config t enable password cisco enter (global command)

Router Name# line vty 0 4

Router Name# login

Router Name# password cisco

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