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Chapter 4
Introduction to the Cisco IOS
Once the IOS is loaded, the information learned from the POST will be
displayed, as shown next:
cisco 2621 (MPC860) processor (revision 0x101) with
26624K/6144K bytes of memory.
Processor board ID JAD050697JB (146699779)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
1 Serial network interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)
Once the IOS is loaded and is up and running, then a valid configuration
will be loaded from NVRAM.
If there is no configuration in NVRAM, then the router will go into
setup
mode
--a step-by-step process to help you configure the router. You can also
enter setup mode at any time from the command line by typing the command
setup
from something called privileged mode, which I'll cover in a minute.
Setup mode only covers some very global commands, but it can be really
helpful if you don't know how to configure certain protocols, like bridging
or DECnet.
Setup Mode
O
kay, you actually have two options when using setup mode:
Basic
Management
and
Extended Setup
. Basic Management only gives you
enough configurations to allow connectivity to the router, but Extended
Setup gives you the power to configure some global parameters as well as
interface configuration parameters:
--- System Configuration Dialog ---
Would you like to enter the initial configuration dialog?
[yes/no]:
y
At any point you may enter a question mark '?' for help.
Use ctrl-c to abort configuration dialog at any prompt.
Default settings are in square brackets '[]'.
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