Example filesystems include TFTP, represented by TFTP:, Flash Memory, represented by Flash:
Ram, or System: and NVRAM or NVRAM: and USB Flash
and as an example, you may have USB flash 0 or USB flash 1.
This is dependent on what's available in your router.
So on the 1841 show, filesystems allows us to view various filesystems available on the router notice
system, NVRAM, Flash, TFTP, RCP, FTP and others.
Now Opaque represents a logical internal filesystem used for internal functions and commands.
Network is an external file system, so notice network for TFTP, network for HTTP, FTP, and others.
So network represents an external filesystem of different servers using different protocols, disk
is used for Flash, and this is the place where the Cisco iOS is going to be booted from by default.
Notice the hash sign or pound sign, USB flash is used for USB flash and NV
RAM is nonvolatile RAM.
That's where the startup config is stored.
The show running-config command displays the running-config found in system.
The show sort up config command displays the startup-config found in NVRAM and Show Flash refers
to the default filesystem, which is typically Flash 0.
So once again, show run shows us the current configuration found in system.
Show startup-config shows us the saved configuration found in NVRAM and show flash shows us the
built-in flash on the router.
So as an example here, we only have
one flashcard available, but you may have more depending on the router that you're working on. As an
example, we could say copy
and notice all the options, so let's say copy NVRAM,
I noticed there are different options here, including
the startup config. So startup-config
and let's save that
in Flash
as copy start.
cfg,
show flash,
there's our copy start config, and if we use the command more flash copy
start config
this shows us the copy of the startup config that we copied from NVRAM.