Cisco Commands Cheet-Sheet

Cisco router some popular commands:

Show

Commands	Meaning
show access-lists	List access lists
show arp	Displays the ARP table of the router address to MAC address mappings
show arp ethernet
show authentication
show boot	show boot attributes
show backplane
show boot-config
show bridge-forwarding
show bridge-group
show bridge-subnets
show buffers
show cdp	Display global information such as frequency of transmissions and the hold time for packets being transmitted.
show cdp entry entry-name [protocol | version]	Display information about a specific neighbor. Display can be limited to protocol or version information.
show cdp interface [type number]	Display information about interfaces on which Cisco Discovery Protocol is enabled.
show cdp neighbors	Displays information of connected routers found through the Cisco Discovery Protocol
show cdp traffic	Display Cisco Discovery Protocol counters, including the number of packets sent and received and checksum errors.
show cef	Displays information about packets sent by Cisco Express Forwarding
show clock	Displays the system clock of the router
show clns	Displays information on connectionless mode network service packets that have passed through the router
show controllers	Displays clock rate and connected cable type for interface hardware element
show controllers tech-support	Displays general information about a VIP card for problem reporting
show context	Displays context data
show crypto	Encryption module
show current	Displays the current Multiple Spanning Tree Protocol settings and allows you to edit them
show debugging	Display information about the types of debugging that are enabled for your router.
show disk:	Displays file system information for the disk at the given slot number
show dtp	DTP information
show environment	Displays temperature, voltage, and blower information
show etherchannel	EtherChannel information
show file systems	Lists available file systems
show flash	Displays information about Flash memory
show hardware	Displays the hardware specific information for the router
show history	Displays command line history
show hosts	Displays the configured hostnames and their corresponding IP addresses of the router
show interfaces	Displays information of all interfaces in the chassis or one specified interface
show interface fa0/0
show interfaces switchport	Displays the status of a switching (non routing) port
show interfaces trunk	Displays information on the interface-trunk
show inventory	Displays the product inventory listing and UDI of all Cisco products installed on the router
show ip interface	Displays statuses of all IPv4 interfaces, add brief to get a summary
show ip interface brief	Displays a summary of all IPv4 interfaces,
show ip route	Displays the IPv4 routing table of the router
show ip traffic	Displays statistics on IP traffic
show ip wccp	Displays information related to the Web Cache Control Protocol
show ipv6 interface	Displays statuses of all IPv6 interfaces, add brief to get a summary
show ipv6 interface brief	Displays a summary of all IPv6 interfaces,
show ipv6 route	Displays the IPv6 routing table of the router
show logging	Displays the state of syslog and the contents of the standard system logging buffer.
show mac	MAC configuration
show mac-address table	Displays the MAC address table
show mls	Show MultiLayer Switching information
show pending	Displays the candidate Multiple Spanning Tree Protocol settings and allows you to edit them
show port-security	Show secure port information
show privilege	Show current privilege level
show processes cpu	Displays all processes and their CPU utilization
show processes detailed	Displays detailed information about all current processes or a specified process
show processes memory	Displays the amount of memory used by each system process or a specified process
show protocols	Displays status of configured Layer 3 protocols; both parameters are optional
show running-config	Displays configuration currently running in RAM
show sessions	Information about Telnet connections
show snmp	snmp statistics
show spanning-tree	Displays information about the spanning tree state
show ssh	Status of SSH server connections
show stacks
show startup-config	Displays configuration saved in NVRAM
show storm	Show storm control configuration
show system jumbomtu	Displays the system maximum transmission unit size
show tcp	Status of TCP connections
show tech-support	Show system information for Tech-Support
show terminal	Display terminal configuration parameters
show version	Displays information about loaded Cisco IOS software
show vlan	Displays VLAN information
show vtp	VTP information
show users	Displays all users connected to the router

Ping

Command	Syntax	Option	Meaning
ping	10.1.1.2		Normal ping
ping	10.1.1.2	repeat 100	for fast ping
ping	10.1.1.2	size 2000	size/load ping
ping	10.1.1.2	size 1500 df-bit
ping	10.1.1.2	source loopback 0	source ping
Ping	8.8.8.8	source 103.15.41.1 repeat 100	source and repeat together

 

 

 

Traceroute

 "Traceroute Commands OUTPUT"

!H - the output indicates that the host is unreachable. 

number of miliseconds – the round-trip time in milliseconds. 

* – the probe has timed out. 

A – administratively prohibited (for example, with an access-list). 

Q – source quench (the destination is too busy). 

I – user interrupted test. 

U – port is unreachable. 

N – the network is unreachable. 

P – the protocol is unreachable. 

T – timeout. 

? – unknown packet type.