missing commands in Cisco IOS

["John M. Brown" <jmbrown () ihighway net>]

So I am trying to help a downstream ISP get BGP up and running.  It seems
that   prefix-list  and peer shutdown functions don't exist on there rev.

The strange thing is that their rev is newer than mine.

me 7206  IOS 11.1-19(CC)

them  3640  c3640-i-mz.112-18.P is the flash image 


So what ver should they tell there vendor to get them ??