[CentOS] coordinated NIS and LDAP servers

Hello listmates,
We are currently running NIS for authentication but would like to
migrate to LDAP. Thing is, though, that some of the machines that
authenticate via NIS are so old I'd rather not even touch them.
Hence the question - is there a good way to have an NIS server for
user authentication that is a mirror image of an LDAP server, with a
proviso that an update introduced there is replicated in the LDAP
server's databases?
Thanks.
Boris.