We show below the show commands that we can use within Cisco routers and switches to extract information of all kinds, necessary in the daily life of a network administrator..
Show Interfaces
Display complete statistics of all router interfaces:
Router # show interfaces
Show serial interface
Display the information of this serial interface:
Router # show interface serial 0/0/0
show ip interface brief
Display a summary of all interfaces including status and IP address
Router # show ip interface brief
Show controllers name_interface
Displays the hardware statistics of an interface
(information on whether the cable is DTE or DCE): Router # show controllers name_interface
Show clock
Display the router time:
Router # show clock
Show history
Display the history of used commands:
Router # show history
Show flash
Display information about the flash memory and the IOS files that are stored in it:
Router # show flash
Show version
Display the information about the router and the IOS image that is running in RAM, it also shows the value of the router configuration registry:
Router # show version
Show arp
Display the router's ARP table:
Router # show arp
Show protocols
Deploy the configured layer 3 protocols:
Router # show protocols
Show startup-config
Display the settings recorded in the NVRAM:
Router # show startup-config
Show running-config
Display the configuration that is currently running in RAM:
Router # show running-config
Show hosts
Display the cached list of host names and their addresses:
Router # show hosts
Show users
Display all users connected to the router:
Router # show users
Show ip route
Display the routing table of the router:
Router # show ip route
The routing table is the list of all the networks that the device can reach, its metric, and the way it accesses them.
Show ip route summary
Display the summary of the router's routing table:
Router # show ip route summary
Show ip traffic
Display the statistics of the IP traffic on the router:
Router # show ip traffic
Show access-list
It displays the access lists configured and the number of hits that each line has received, in this way we can make a better debug of any problem with the access lists:
Router # show access-list
Show cdp neighbors
Display a report of all Cisco devices to which we are connected:
Router # show cdp neighbors
Show cdp neightbors detail
Display a detailed report of all Cisco devices to which we are connected:
Router # show cdp vecinos detail
Show inventory
Display the card inventory:
Router # show inventory
Show processes
Displays the active processes:
Router # show processes
Show sessions
Display the Telnet connections established in the router:
Router # show sessions
Show memory
Display the router's memory statistics:
Router # show memory
Show tech-support
Display the complete system information:
Router # show tech-support
Show ip rip database
Display the routing protocol RIP information:
Router # show ip rip database
Show ip eigrp topology
Display the learned routes with the eigrp protocol:
Router # show ip eigrp topology
Show vlan
Display the list of existing vlans on the switch:
Switch # show vlan
Show vlan-membership
Display the list of vlans and the interfaces assigned to each vlan:
Switch # show vlan-membership
Show mac-address-table
Display the information in the mac address table:
Switch # show mac-address-table
show spanning-tree
Display the spannig-tree protocol information:
Switch # show spanning-tree
Show boot
Show the boot file:
Switch # show boot
Surely you're going to take a lot of advantage of all these Cisco show commands , if you know any more you can share it in the comments.
Do not forget that you have more guides!
Commands to configure Cisco switch and router
