http://www.inetdaemon.com/tutorials/internet/ip/routing/interior_vs_exterior.shtml

Interior routing protocol:
OSPF or RIP...
Generally OSPF as it multicast only the change in routing table unlike RIP where whole table is sent periodically in the network.

OSPF also allows to add extra cost parameters to routing table entries or paths.
we can use link state or distance vector approach for generating routing table.