Routing protocols are divided into IGP (internal routing protocol) and BGP (border gateway protocol)
RIP OSPF EIGRP belong to IGP, namely the routing protocol used by an autonomous system
And BGP is used by the mutual visit between autonomous systems, it involves the ISP operators, can be understood as an autonomous system is a large router, the router running protocol is BGP, the autonomous system here is only on the physical meaning of autonomous systems such as unicom network telecommunication network
RIP is a distance vector routing protocols, it through the exchange of a clear route to reach entire network communication, namely that he gained by the routing are sent via neighbors to come over, similar to the way of the road about
OSPF is a link-state routing protocol, he doesn't send routing information, but by sending link-state routing entry LSA to calculate alone, similar to the GPS to send to each other after bearing the specific how to get to the local system is calculated