Best Practices for Authoritative Servers

[Baird, Josh]

I currently have three authoritative (non-recursive) internal
nameservers (these servers are listed in the NS RRset for all of my
internal domains).  I also have several resolving/caching servers which
hold the slave zones for these authoritative servers.  On these
resolving servers, the zone definitions only define one of the three
authoritative servers.  Would it be best to include all three
authoritative servers in the zone definitions for the slaves?  What
benefit would I gain?  Is there even a point in having three
authoritative servers, when only one is listed in the zone definitions
for the slaves?
 

I appreciate any input.

 

Thanks,

 

Josh