Hi Val_Loukine,
I tried to set the below routemaps but none helped. When I set the last command the current advertising subnets to the peer will instantly stop and no subnet will be advertise. My idea of the below set of command is to advertise only the 10.1.13.0/24 to the peer.
set routemap SYD_TEST id 101 on
set routemap SYD_TEST id 101 allow
set routemap SYD_TEST id 101 match as 3637 on
set routemap SYD_TEST id 101 match neighbor 192.168.71.50 on
set routemap SYD_TEST id 101 match network 10.1.13.0/24 exact
set routemap SYD_TEST id 101 action nexthop ip 192.168.71.52
set bgp external remote-as 3637 export-routemap SYD_TEST preference 1 family inet on