A short listing of handy commands used on a regular basis:
#show ip interface brief
Shows status of the interfaces on the device, including up/down and ip information.
#show ip protocol summary
Will show you all the routing protocols running on the router
#show log
Will display the configured log settings and buffered log messages
#show interfaces status
Shows Port, Status, VLAN, Duplex, Speed and Type for all interfaces.
#show interfaces summary
Live traffic stats on the interfaces.
#show ip arp
Displays the IP to MAC Address resolution for all the IP’s on the device, and from the interfaces it was learned.
#show mac address-table
Shows the MAC table entry and interface it is being seen on.
#show policy-map [interface]
Displays the QoS Policy information
#show interfaces link
Will display how long the interface has been disconnected
#show version
Displays information about the device. It gives you details such as; IOS version, System Uptime, Image filename, Type of Processor, Amount of RAM, Number of Ports, Flash Memory, MAC Address and Serial Number
#show clock
Displays the clock status
#show version | include uptime
Shows the uptime of the device
#show processes cpu
Displays the CPU utilisation stats
#show processes cpu history
Displays a one minute output, and so on……
#show history
Lists the commands the user has entered in the session
#show inventory
Displays all the inventory information about the device
#show line
Lines connected on the router’s physical ports, such as serial connected.
#show cdp neighbour
Shows the directly connected devices with local and remote interfaces, via Cisco’s Discovery Protocol
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