Is anyone set up to use anycast for internal DNS?

Good Afternoon,
I've been considering using Anycast to provide some redundancy for internal DNS lookups. Configuring DNS and subsequent slave zones in Leopard is easy enough and as I understand it, Anycast is just a way of configuring routers so that one IP address can resolve to many different machines.
I see some of the benefits of using Anycast in that we can have the same 2 dns ip addresses in perpetuity and that as long as one node is up, people will be able to get out.
So my question to you guys: Has anyone done this? If so, is there anything I need to look out for before I start? Is there something you wish you'd known before you started down this path.
I'd love to hear your experiences and read any documentation you might have kept. I thought Mr Hoffman's write up on his DNS services was really excellent btw.
Cheers,
dave

Do you have a particularly large infrastructure?
IP Anycast is usually implemented via BGP announcements from your router(s), with each router using the BGP tables to determine the 'best' server to use. If you're doing this for internal DNS then that assumes you're already running IBGP.
Even then, BGP is a pretty dumb protocol - all it does is say 'hey, here's how to get to a.b.c.d IP address'. It has no idea whether the specific server/service you're after is available at that address.
In other words, even if you setup IP Anycast via IBGP you'll still have clients routing to a dead server unless you can somehow update your BGP tables when a server goes down. Not a trivial task for most routers.
It sounds like what you really want is more load balancing than IP Anycast. There are numerous load balancers than can do this. Another option (if your DNS servers are physically close) is to use some kind of failover process so that the second server assumes the role (and IP address) of the first server should it fail (and vice versa). That option is built-in to Mac OS X Server (although it takes a little command-line jiggling to get it working).
Then again, the whole point of defining multiple DNS servers on the client is that the client will automatically fail over to alternate servers if it doesn't get a response from the first - in other words, the clients already have built-in failover for DNS (although the user will notice lookup delays when the primary server is offline).

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