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Primarily, the Cisco IOS offers these modes of operation: the user EXEC mode, the privileged EXEC mode, the Global Configuration mode, and other specific configuration modes such as; the Interface Configuration mode, Line Configuration Mode, and Router Configuration Mode.
The initial prompt you interface with when you first connect to a Cisco network Router or Switch is the user EXEC mode. This is denoted by a text and the greater-than (>) sign to the right of the text. See below an example of user EXEC mode prompt:
Router0>
The text represents the hostname of the device, which by default is the device type; Router or Switch. In this mode, you cannot edit or view device configurations; you can only view the device’s status and other miscellaneous information. See below a list commands you can execute in this mode:
disable Turn off privileged commands
disconnect Disconnect an existing network connection
enable Turn on privileged commands
exit Exit from the EXEC
logout Exit from the EXEC
ping Send echo messages
show Show running system information
ssh Open a secure shell client connection
telnet Open a telnet connection
terminal Set terminal line parameters
traceroute Trace route to destination
Update: Approved and released: 5/16/17
Big update with lots of improvement. We added new supported commands and features.
added privileged commands:
show ip dhcp pool
release dhcp fastethernet PORT/PORT
release dhcp serial PORT/PORT
renew dhcp fastethernet PORT/PORT
renew dhcp serial PORT/PORT
added router interface commands:
vrrp [1-255] ip A.B.C.D
vrrp [1-255] preempt
vrrp [1-255] preempt delay minimum [0-3600]
vrrp [1-255] priority [0-255]
no vrrp [1-255] ip A.B.C.D
no vrrp [1-255] preempt
no vrrp [1-255] preempt delay minimum [0-3600]
no vrrp [1-255] priority [0-255]
vrrp [1-255] track [1-500]
no vrrp [1-255]
no vrrp [1-255] track [1-500]
vrrp [1-255] track [1-500] decrement [1-255]
no vrrp [1-255] track [1-500] decrement [1-255]
improved layer 2 & layer3 path finding logic
improved DHCP address assignment speed
improved routing table update routine
improved switchport status checking
added multiple invalid entry checks and messages
added network and broadcast address checks when setting interface ip address
added lab alert for possible ip address conflict
added IPv6 address to the topology view if IPv4 is not configured
updated subinterface mac address
updated ip route and ipv6 route display
updated cisco device ping result: Sending 5 ICMP Echoes
updated ping and traceroute results for bad IP or hostname
updated resutls for: show ip dhcp server statistics
updated traceroute to use the real IP instead of HSRP/VRRP virtual address
updated hsrp mac address to hex of standby group
subinterfaces are now included in the routing protocol process
design save warns for disconnected devices or multiple networks in the lab
fixed number range checking
leading zeros on type numbers removed
ospf no longer takes 0.0.0.0 as router-id
fixed configuration issue when setting a loopback address with 255.255.255.255 mask
fixed ospf path finding
fixed app crash issue with command: show ip protocols
fixed design issue where port labels are not removed when removing a connection
Other stability improvements
Update: Approved and released: 1/16/17
Submitted: 1/15/17
What's new:
expanded network design area
added privileged command:
show track
added router global commands:
track [1-500] interface fastethernet PORT/PORT line-protocol
track [1-500] interface serial PORT/PORT line-protocol
track [1-500] ip route A.B.C.D A.B.C.D reachability
updated show ip route results:
directly connected networks are not shown when port is down
static routes are not shown when outgoing port line is down or when next hop does not exist
What's new:
added EIGRP and OSPF support for tunnels
updated EIGRP and OSPF to accept both subnet masks and wildcards during network configuration
added command: show interfaces tunnel [0-2147483647]
updated autocomplete and other minor updates