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Define optional locally significant descriptor of the link (routers and switches).
Router(config-if) #description Blah blah
Assign address and subnet mask to serial interface
Router(config-if)# ip address a.a.a.a m.m.m.m
Assign a clock rate for the serial interface (DCE only)
Router(config-if)# clock rate rrrrr
Turn interface on
Router(config-if)# no shut
Move to FAst ethernet x/y interface mode
Router(config)# int fax/y
Create a MOTD banner.
Router(config)# banner motd # Blah blah# Where the non-initial # is a delimiter
Set the time zone for display purposes based on CUT.
Router(config)# clock timezone thezone disp
Assign a locally significant host name to an IP address.
Router(config)# ip host shem a.a.a.a
Turn off trying to automatically resolve an unrecognized command to a local host name if one is not going to set up DNS.
Router(config)# no ip domain-lookup
Turn on synchronous logging. Information items sent to console will not interrupt the command one types. The command will be moved to a new line
Router(config-line)# logging synchronous (The informational line does not get inserted into the middle of the command one was trying to type. If one were to continue typing
Set time limit when console automatically logs off.
Router(config-line)# exec-timeout m s (Don't use 0 0 in production as it means no timeout.)
Save the running-config from DRAM to local NVRAM Router will execute commands in order they were entered on next reload
Router# copy run start [pre 12.0] copy system:running-config nvram:startup-config [12.x] (Doesn't exist for 1900 series switch)
Save the running-config remotely to TFTP server
Router# copy run tftp [pre 12.0] copy system:running-config tftp: [12.x] Will have to reply IP address of TFTP server & dest file name.
Delete the startup-config file from NVRAM without affecting dynamic memory.
Router# erase start [pre 12.0] erase nvram: [12.x] (Reload the router to clear the running-config.)
Default routing in static case using next-hop address
Router(config)# ip route 0.0.0.0 0.0.0.0 a.a.a.a
Default routing in static case specifying exit interface
Router(config)#ip route 0.0.0.0 0.0.0.0 typeport
Display contents of IP routing table
Router# show ip route (The codes to the left of the routes in the table tell you from where the router learned the routes. A static route is described by the letter S.)
Instruct IOS to forward packets destined for an unknown subnet to the best supernet route. A supernet route covers a range of subnets with a single entry. Cmd used in RIP.
Router(config)# ip classless
Enable RIP (v1 or v2) as a routing protocol from this mode.
Router(config)# router rip
Specify the network number of the directly connected network you want to advertise. In RIP-1
RIP-2
RIP updates will not be sent out an interface
Router(config-router)# passive-interface typeport
Define a specific neighbor with which to exchange information
Router(config-router)# neighbor a.b.c.d
Turn off split horizon (on by default)
Router(config-router)# no ip split-horizon
Change timers in RIP in seconds except where specified.
Router(config-router# timers basic upd inv holddwn flush sleep(ms)
Limit the number of paths for load balancing to x
Router(config-router)# maximum-paths x (4 = default
Generate a default route into RIP.
Router(config-router)# default-information originate
RIP will now send and receive RIP-2 packets globally as v1 is default
Router(config-router)# version 2
Make interface send only RIP-1 packets
Router(config-if)# ip rip send version 1
Make interface send only RIP-2 packets
Router(config-if)# ip rip send version 2
Make interface send both RIP-1 and RIP-2 packets
Router(config-if)# ip rip send version 1 2
Make interface receive only RIP-1 packets
Router(config-if)# ip rip receive version 1
Make interface receive only RIP-2 packets
Router(config-if)# ip rip receive version 2
Make interface receive both RIP-1 and RIP-2 packets
Router(config-if)# ip rip receive version 1 2
Display all RIP activity in real time
Router# debug ip rip
Display contents of the RIP database
Router# show ip rip database
Change back to RIP-1
Router(config-router)# no version 2
Change RIP routing to RIP-1 from router-config mode.
Router(config-router)# version 1
Turn off RIP-2's summarization of networks at the classful boundary.
Router(config-router)# no auto-summary
Re-enable RIP-2's summarization of networks at the classful boundary.
Router(config-router)# auto-summary
Enable IGRP routing process. No longer supported by Cisco as of Cisco IOS Software Release 12.3. If one uses Cisco IOS 12.3 or newer code
one must use either Enhanced IGRP (EIGRP) or one of the other standardsâ€"RIP-1
Disable the IGRP routing process
Router(config)# no router igrp as-number
Remove network w.x.y.z from the IGRP routing process.
Router(config-router)# no network w.x.y.z
Set the bandwidth of this interface to x kilobits to allow IGRP to make a better routing decision
Router(config-if)# bandwidth x
Allow IGRP to accept unequal-cost routes
Router(config-router)# variance x
Show all IGRP events in real time.
Router# debug ip igrp events
Show IGRP updates between routers
Router# debug ip igrp transactions
Turn on the EIGRP process All routers in the same AS must use the same AS number
Router(config)# router eigrp as-number (1 - 65535)
Specify which network to advertise in EIGRP
Router(config-router)# network w.x.y.z
Log any changes to an EIGRP neighbor adjacency. Recommended for debugging.
Router(config-router)# eigrp log-neighbor-changes
Turn off the auto-summarization feature in EIGRP. Networks are summarized at the classful boundary by default in EIGRP.
Router(config-router)# no auto-summary
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