I have another confusion regarding BGP.I have the below setup in lab.
Routers B,C,D are in AS200
Router A is in AS100 and it is connected to Router B through EBGP.
Router E is in AS300 and it is connected to Router D through EBGP.
Router B and D and IBGP neighbours.
Now if Router A is advertising a network to Router B it will propogated to Router D but it is not installed in the routing table..please explain why.