Routing protocols are further classified into two categories such as

• Interior Gateway Protocols
• Exterior Gateway Protocols.

• Routing Information Protocol (RIP) V1
• Routing Information Protocol (RIP) V2
• Interior Gateway Routing Protocol (IGRP)
• Enhanced Interior Gateway Routing Protocol (EIGRP)
• Open Shortest Path First (OSPF) Protocol
• IS -IS
• NLSP
• RTMP
• IPX RIP

B. Exterior Gateway Protocol (EGP)

• Border Gateway Protocol (BGP)