The Nokia implementation of BGP uses route policies extensively. The implied or default route policies can be overridden by customized route policies. The default BGP properties, with no route policies configured, behave as follows:
Accept all BGP routes into the RTM for consideration.
Announce all used BGP learned routes to other BGP peers
Announce none of the IGP, static or local routes to BGP peers.
Figure: OSPF route policy diagram