We had a requirement that to upgrade a server to a new hardware in production environment.
The server's IP cannot be changed due to upstream service constraints. We are not allowed to do "hard" cut-over as well because a lot of configurations can only be done when new server is put online.
I need to bring up the new server with the same IP address on the same switch. Ideally, I need a way to control incoming traffic to be sent to the new server during maintenance window and switch back to the old one when window is over.
I do not want to do it in hard way by switching the cable or disabling switch ports. Is there a way to manipulate or control the ARP table and tell the switch which port to send traffic? That way, two servers with same IP co-exist on the LAN and I can control which one is active by configuring the LAN switch.
We are using Cat6500 on IOS 12.4.x