How do I change the cisco 3500xl management IP address? or Explain why to leave it the way it is?

I am very green with this managed switch stuff.  Please be patient, if needed I can seperate the sub questions, but thought for a pro it would be easy to quickly answer.

I just picked up a nice little cisco cat 3500xl switch and am attempting to grasp managed switches.  I started it up and connected to it, set it up using an address We use for our internal network mask   I am planning on moving the switch to a remote office that uses 128.0.0.x for their addresses.  I want to managed it easily in that network and expect I need to change the switches managemet address, but have not found any help in a couple of days looking.  

Do I need to just start the config over?  cannot believe this to be the case with a nice cisco product.

Is this manditory?  I dont think I need to change the management ip but think it best to keep the switchs mgt ip on the same subnet as the rest of network.

Please help me to make this IP change, and if possible please try to clear up the other questions I had.

Who is Participating?
Nayyar HH (CCIE RS)Connect With a Mentor Network ArchitectCommented:
You dont need to start config all over, you should be able to change management IP address alone.

No you dont have to change the management IP, but if you dont and move the switch to a new LAN 128.x.x.x  you wont be able to connect to or manage the switch.

If you do a "show ip interface | i lan" this should show you the VLAN interface currently assigned the management address. Would mostly likely be VLAN 1.

To change the managment IP go into the VLAN interface and apply the new IP address. Caution: You will loose IP connectivity to the switch itself once you change this address and you will have to reconnect to the new IP address.

An example config shown below;

Conf t
int vlan <vlan_number>
ip address <IP_address> <subnet_mask>
no shut

marcomnordicAuthor Commented:
OK, I am connected thru the consol as well as IP so this should not be an issue, correct?

Nayyar HH (CCIE RS)Network ArchitectCommented:
Since you're connected via console there wont be an issue. Remember once changed you will need to change the default gateway as well.
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marcomnordicAuthor Commented:
I can get it to show VLAN1 and the IP

this command, and result

cisco.252#show ip interface

VLAN1 is up, line protocol is up
  Internet address is
  Broadcast address is
  Address determined by setup command

Cannot use the commands given
marcomnordicAuthor Commented:
I will have to jump back into this tomorrow, Sorry to run, but Im sure it will work out.
Nayyar HH (CCIE RS)Network ArchitectCommented:
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