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Assuming you have updated the ports-dns collection proceed as normal:
cd /usr/ports/dns/bind9
make install clean
The above sequence installs BIND9 in /usr/local/sbin and the tools in /usr/local/bin and assumes the named.conf file is in /usr/local/etc.
If you want to run BIND9 at startup you must edit /etc/rc.conf as follows:
# add following line if not present
named_enable=”YES”
# the line below must [...]

Administrative tools play an integral part in the management of a server.

named-checkconf
The named-checkconf program checks the syntax of a named.conf file. 

named-checkconf [-jvz] [-t directory] [filename]

named-checkzone
The named-checkzone program checks a master file for syntax and consistency. 

named-checkzone [-djqvD] [-c class] [-o output] [-t directory] [-w directory] [-k (ignore|warn|fail)] [-n(ignore|warn|fail)] [-W (ignore|warn)] zone [filename]

named-compilezone
Similar to named-checkzone, but it always dumps the zone content to a specified file (typically in a different format). 

rndc
The remote name daemon control (rndc) [...]

In this section we provide some suggested configurations along with guidelines for their use. We also address the topic of reasonable option setting.

3.1. Sample Configurations

3.1.1. A Caching-only Nameserver
The following sample configuration is appropriate for a caching-only name server for use by clients internal to a corporation. All queries from outside clients [...]

A Slave DNS gets its zone file information from a zone master and it will respond as authoritative for those zones for which it is defined to be a ’slave’ and for which it has a currently valid zone configuration.
The term ’slave’ was introduced in BIND 8.x and replaced the term ’secondary’.
Slave status is defined [...]