ProCurve Switches

I have a stack of two 2920 HP ProCurve switches. They have an IP assigned to them on VLAN 1 of 10.1.7.5 255.255.248.0
I want to change this to 10.1.7.147 255.255.248.0.
When I try to do this via a console connection using Putty I get the following error.

"An interface with the same IP address or subnet or an overlapping network 10.1.7.147/21 already exists."

What would cause this and how can I complete this change?
TabDBAsked:
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Zephyr ICTCloud ArchitectCommented:
Before you change the IP, did you check if the address is free? What happens when you ping 10.1.7.147?

The error would suggest that address is in use by something else.
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TabDBAuthor Commented:
Yes the IP is free. It cannot be pinged. I performed a ping from within the web portal on the switch to the 147 address and it is clean.
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Zephyr ICTCloud ArchitectCommented:
Ok ... Then try following commands through the console:

vlan 1

 name “VLAN1″

 no ip address 10.1.7.5 255.255.248.0

 ip address 10.1.7.147  255.255.248.0

Notice, this might not work if you do it remotely ...

If you want to reconfigure the IP remotely you should use the console menu instead ... If I remember correctly:

menu -> Switch Configuration -> IP Configuration -> edit it and hit Enter.
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convergintCommented:
If you have /13 subnet mask, you are technically assigning a range of 10.1.0.0-10.1.7.255 to that vlan.  You must have an overlapping subnet vlan on your switch that is causing that error.  Check all your other vlans and their IP addresses and subnets.

If you need help to figure out the subnets, I use this site all the time.  http://www.subnet-calculator.com/subnet.php?net_class=A
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