Maintenance page redirect with LC/LTM

There are a few ways of getting around this, depending what your situation is.

1.

Put your current pool members in a high priority group, and your destination redirect server in a low priority group. The latter will get used when your normal servers are down.

or

2.

Set up a separate virtual server that does the HTTP redirect and have this server as the sole member of a low priority group (similar to 1 above) in the server pool of your main virtual server.

You need to configure an appropriate health monitor obviously.