Not able to change configuration registry to 0x2102 - returning "usage: confreg"

[RobCannon3691]

As title explains, I am not able to change the confreg in rommon to 0x2102 by issuing:

rommon 5 >confreg 0x2102
usage: confreg

When I issue confreg, I am trying all sorts of options and am always booting in 0x0101 or 0x0142. 

How do I change the configuration registry in this case.  This relates to this issue that I am still struggling with. 

Thank you for any help.....

[Leo Laohoo]

try "confreg 2102".

[RobCannon3691]

Thank you for the help.

That command returns the same thing. 

rommon 10 >confreg 2102
usage: confreg

Env vars still the same. 

[Leo Laohoo]

Is this a router or a switch?

[RobCannon3691]

Very sorry, should have mentioned that. 

C4948 switch running rom monitor 12.2. 

I am trying to get the IOS image on via tftp but am in the wrong configuration right now. 

[Leo Laohoo · Accepted solution]

If this is a switch then 0x102 is "right".
What error message did you get when trying to copy an IOS into the switch?

[RobCannon3691]

Thank you for the help. I'm a noob with this stuff. All the docs I read told me to change the confreg even though I am really just trying to load the OS which is missing from the bootflash. 

I am getting a timeout error when I run 

boot tftp://192.168.10.2/cat4500-ipbasek9-mz.150-2.SG11.bin

even though I am able to successfully ping that address.  I started up the tftp server on that host and binded it to the address and put the right image in the TFTP-Root folder.  They are connected via the management port with a straight cable. 

 Tftp Session details are ....

 Filename     : /cat4500-ipbasek9-mz.150-2.SG11.bin
 IP Address   : 192.168.10.3
 Loading from TftpServer: 192.168.10.2

 Tftp session failed: maximum retransmission count exceeded

Oddly though I am not able to ping the other way (tftp to switch).  I would use other commands (tftpdnld and xmodem) but they are missing. 

All help greatly appreciated. 

[Leo Laohoo]

Read this:  Recover from a Corrupt or Missing Image

[RobCannon3691]

Thank you for the suggestion. 

I was following that before and had no luck but then it occurred to me that I pinging the tftp wasn't enough, I had to open port 69 on the firewall to get it loaded. 

Just got it running.  Thank you so much for your time.