Most Important Cisco Router Command?

[Rubicone]

I am just reading-up on them and wanted to know what commands does one end-up using the most and need to memorize? TIA.

 

[CTR]

en 😉

 

[Ladi]

?

~Ladi

 

[Hard_Boiled]

I dunno which is must important, enable or en is very important, use it every time. Are you talking about commands that might show up on the Cisco tests? If so, then you should really memorize the format of commands. Like setting up access list, or any commands that are kinda long. Also, the "show" command is very important, and you must know what and where to look for certain configuration info. Ther's show version, show interface, show run; all sorts of stuff.

 

[Rubicone]

Oops should have pluralized the word command in the title of the thread.I am being tested on this in a few weeks and would ask for more concrete suggestions not for the test but rather when I get out and actually have to do this in real life and not within the confines of a lab.

Update: Did not get a chance to read Hard_Boiled's response before posting the above paragraph. Here are some additional questions: if the commands are different in any way for the various versions of CISCO routers? And what of routers from other manufacturers? Is one going to have to learn a whole set of new commands to work with Nortel or Lucent products? TIA.

 

[Garion]

Some general notes:

the question mark is your friend. If you're not sure what to do, press the ? for a list of commands. This works alone or as part of another command.

IE,
Router# ?
will show you a list of all the main commands. If you know the command you want, like "show", just follow it up with a ?.
Router: show ?
.. And it will show you all of the "show" commands.

You can keep going on this same idea:
Router: show interface ?

Basic commands to know:

enable / normal mode:
show interface
show version
ping (host)
traceroute (host)
enable

enable mode only:
config
copy run start (or "write mem" - Does the same thing)
ping (with no command line arguments gives an extended ping - Very useful)
traceroute (Same deal)

In global config mode
interface (int name) (Takes you into the inteface config mode)
Ctrl-z to exit

in interface config mode
IP address a.b.c.d w.x.y.z (a.b.c.d = IP address of interface, w.x.y.z = subnet mask)
Ctrl-Z to exit

- G

 

[Hard_Boiled]

I've never worked with the earlier versions of the Cisco IOS, but I know some commands have been replaced. Some older commands may still work, but I believe they will be phasing them out in newer releases of the Cisco IOS.

AFAIK the Cisco IOS is the same on every router, well as long as we're talking about the current version. Some routers probably have special features or capabilites that you wouldn't use on other routers, I'm no expert but I'd imagine that is the case. I've never worked with any routers besides Cisco, but I'm sure the commands aren't exactly the same, maybe just a little different.