Distributing DNS servers

[Bill Larson]

I've been following this thread about DNS server failover capability
and have been quite impressed.

One question though, how quickly can OSPF or BGP routes be switched,
and what triggers it?  Are you talking about an automatic detection
process that triggers the routing table changes, or is it performed
manually?  And, does the routing changes occur in seconds or minutes?

Thanks,

Bill Larson (wllarso at swcp.com)