With games networks, you have a lot of server instances, over a lot of boxes, using a lot of IP space.
Sometimes, you have to move server instances from one box to another, and obviously, you want to minimise the downtime, and minimise the inconvenience to users - so you'll want to move the IP address(es) too.
Usually when you move IP's around, you need to wait a few hours for the Data Centre's BGP routers to recognize the new IP route to the new box.
With games networks, you have a lot of server instances, over a lot of boxes, using a lot of IP space.
Sometimes, you have to move server instances from one box to another, and obviously, you want to minimise the downtime, and minimise the inconvenience to users - so you'll want to move the IP address(es) too.
Usually when you move IP's around, you need to wait a few hours for the Data Centre's BGP routers to recognize the new IP route to the new box.