So, you need to change the IP address of the management VLAN interface (the so-called Management VLAN). But when you try to do this via the CLI, the switch complains:
# IP address table overflow
So how do you set the IP you need?
Plainly speaking:
you can't!
That's Allied Telesyn engineers for you - for some reason it clicked in their heads and they got the idiotic idea that such operations need to be performed by connecting to the switch's CONSOLE port. You cannot change the management VLAN interface address (usually VLAN 1) via the CLI! Very convenient: say you're sitting in Yekaterinburg managing a switch in Germany. Right, and there just has to be a computer with a COM port nearby in Germany too! Sure! After all, such computers have been "produced" for quite a few years now, especially laptops. Well, sure, you could have a laptop with a PC card... But will it be in the right place???
Now pay attention! Go to the Allied Telesyn support website and you'll see this article: http://alliedtelesis.custhelp.com/cgi-bin/alliedtelesis.cfg/php/enduser/std_adp.php?p_faqid=3095&p_created=1272461183 . So,
UNDER NO CIRCUMSTANCES should you perform the actions described there! The reasonable concern "Won't it drop off" is as reasonable as it gets - it really will drop off! At least it's good that it's not until a reboot (but then again, someone still has to reboot the switch manually, losing connectivity for all devices connected to it or to the stack).
But for some reason the article doesn't say a single word that the switch will drop off, and that they expect you to do this - now that's a mystery - via CONSOLE.
Solution.
I did find a solution - you need the web interface to be working on the switch in question (the one on which you're going to change the IP address). Log in to the web interface and, miracle of miracles, it lets you go ahead and change the IP address of the management VLAN interface, and even the gateway at the same time, in one go, so to speak. And after that you can calmly log in via the new IP and do "copy running-config startup-config".
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