Disaster recovery using as-prepend?

["Christopher J. Pilkington" <christopher.j.pilkington () gmail com>]

My apologies if this question doesn't belong here.

We have a PI /24 we'd like to advertise out of our primary data center
for production use.  (Well, actually, we'll be advertising a more
specific from our /21 assignment, so already not too friendly... but I
digress.)

We have a disaster recovery site which will have a clone of the myriad
production servers.  We'd like to fail over to that site
automagically.

I'm thinking advertising the same prefix and just doing several
as-prepends.  However, now I'm not sure if this is a polite thing to
do or not.

Someone mentioned to me something with MEDs, but as soon as that term
was used, I started twitching, and couldn't follow the conversation.

Would a "good netizen" use the as-prepend method?  Or am I missing a
simpler/more polite solution?

-Christopher