Basic Show Commands
Router#show running-config
Building configuration... Current configuration : 419 bytes ! version 12.4 no service password-encryption ! hostname Router ! ip ssh version 1 ! interface FastEthernet0/0 [output is Omitted]
Active configuration is known as running-configuration. You can view it from router command line interface. showrunning-config command will display active configuration from memory. You can run this command from privileged mode. On a Cisco router active configuration is not saved automatically. So it would lost automatically in the event of power failure. To avoid it you need to save it manually with copy command.
Router#show flash
System flash directory: File Length Name/status 1 33591768 c1841-advipservicesk9-mz.124-15.T1.bin [33591768 bytes used, 30424616 available, 64016384 total] 63488K bytes of processor board System flash (Read/Write)
Flash memory is a special kind of memory on the router that contains the operating system image file(s). Unlike regular router memory, Flash memory continues to maintain the file image even after power is lost.
Router#show history
The routers Command Line Interface (CLI) maintains by default the last 10 commands you have entered in memory .
You can retrieve previous commands by pressing UP Arrow Key
You can retrieve next commands by pressing Down Arrow Key
Router#show protocols
Use this command to view the status of the current layer 3 routed protocols running on your router
Router#show version
Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2007 by Cisco Systems, Inc. Compiled Wed 18-Jul-07 04:52 by pt_team ROM: System Bootstrap, Version 12.3(8r)T8, RELEASE SOFTWARE (fc1) System returned to ROM by power-on System image file is "flash:c1841-advipservicesk9-mz.124-15.T1.bin" [output is Omitted] Cisco 1841 (revision 5.0) with 114688K/16384K bytes of memory. Processor board ID FTX0947Z18E M860 processor: part number 0, mask 49 2 FastEthernet/IEEE 802.3 interface(s) 1 Low-speed serial(sync/async) network interface(s) 191K bytes of NVRAM. 31360K bytes of ATA CompactFlash (Read/Write) Configuration register is 0x2102
This command will give you critical information, such as: router platform type, operating system revision, operating system last boot time and file location, amount of memory, number of interfaces, and configuration register
Router#show clock
*1:46:13.169 UTC Mon Nov 1 2009
Will show you Router clock
Router#show hosts
will display a cached list of hosts and all of their interfaces IP addresses
Router#show users
Will show a list of all users who are connected to the router
Router#show interfaces
will give you detailed information about each interface
Router#show protocols
will show the global and interface-specific status of any layer 3 protocols
Router#show ip interface brief
Interface IP-Address OK? Method Status Protocol FastEthernet0/0 10.0.0.1 YES manual up up FastEthernet0/1 unassigned YES manual administratively down down Serial0/0/0 20.0.0.1 YES manual up up Vlan1 unassigned YES manual administratively down down Router#
This command will show brief descriptions about interface. This command mostly used in troubleshooting. There may be three possible conditions of status.
UP :- interface is up and operational
DOWN :- physical link is detected but there are some problem in configurations.
Administratively down :- port is disable by shutdown command ( Default mode of any port on router.)
UP :- interface is up and operational
DOWN :- physical link is detected but there are some problem in configurations.
Administratively down :- port is disable by shutdown command ( Default mode of any port on router.)
R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
C 10.0.0.0/8 is directly connected, FastEthernet0/0
C 20.0.0.0/8 is directly connected, Serial0/0/0
D 30.0.0.0/8 [90/40514560] via 20.0.0.2, 00:02:55, Serial0/0/0
D 40.0.0.0/8 [90/41026560] via 20.0.0.2, 00:02:54, Serial0/0/0
D 50.0.0.0/8 [90/41029120] via 20.0.0.2, 00:02:50, Serial0/0/0
R1#
This command will give a detail about known route. Router will not forward packet if route is not shown here for that packet. Router’s routing decision is made by this routing table.
R1#show controllers serial 0/0/0 Interface Serial0/0/0 Hardware is PowerQUICC MPC860 DCE V.35, clock rate 64000 idb at 0x81081AC4, driver data structure at 0x81084AC0
Most common use of this command is to find out whether the port is DCE end or DTE. If the port is DCE end then clock rate and bandwidth command will require. As you can see in output that port is DCE.
R1#show ip protocols
Routing Protocol is "eigrp 1 "
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 1
Automatic network summarization is in effect
Automatic address summarization:
Maximum path: 4
Routing for Networks:
10.0.0.0
20.0.0.0
Routing Information Sources:
Gateway Distance Last Update
20.0.0.2 90 16
Distance: internal 90 external 170
Use this command to know about running routing protocols. This will give the complete status about routing protocols likes on which interface its receiving updates and on which interface its broadcasting update what is time intervals
press enter to get back router prompt
Router>
Router>
You are now in User mode. Type ? to view all the available commands at this prompt.
Router>?
Router>?
From privilege mode you can enter in configuration mode by typing configure terminal you can exit configuration mode type exit or <CTL>+z
Router>enable Router#config terminal Router(config)#exit Router#
To view all commands available from this mode type: ? and press: enter This will give you the list of all available commands for the router in your current mode. You can also use the question mark after you have started typing a command. For example if you want to use a show command but you do not remember which one it uses 'show ?' will output all commands that you can use with the show command.
Router#show ? access-expression List access expression access-lists List access lists backup Backup status cdp CDP information clock Display the system clock cls DLC user information compress Show compression statistics configuration Contents of Non-Volatile memory --More--
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