hi EBGP is used when u are going to have communication between two autonomos systems or when u have multihoming to different ISPs or ur network is acting as a transient AS. Now IBGP is used when u want to have the knowledge of the external AS routes in ur network. In that also routers will not pass the routing info unless those routes are learned via internal routing protocols like rip or ospf etc. i.e., it has to synchronize with the interior gateway protocols. if u dont want to let it happen this, u can turnoff synchronization so that the intermediate routers can pass the external route information to other routers with out the IGPs having the knowledge of these routes. hope it clears ur doubt regards deepak
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