[updated]
dn: cn=NIS Server,cn=plugins,cn=config

dn: nis-domain=example.com+nis-map=mac2name,cn=NIS Server,cn=plugins,cn=config
nis-domain: example.com
nis-map: mac2name

dn: nis-domain=example.com+nis-map=name2mac,cn=NIS Server,cn=plugins,cn=config
nis-domain: example.com
nis-map: name2mac
nis-map: name2mac2

[result]
dn: cn=compat,cn=accounts,dc=example,dc=com

dn: cn=g2,ou=group,cn=compat,cn=accounts,dc=example,dc=com
gidNumber: 2002

dn: ou=group,cn=compat,cn=accounts,dc=example,dc=com