Port numbers are use by TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) while Protocol numbers are reserved number used to identify protocols
(Interior Gateway Protocol)
Unreliable transportation
- Routing Information Protocol (RIP v2) – UDP port 520
- Open Shortest Path First (OSPF) – IP Protocol 89
- *Interior Gateway Routing Protocol (IGRP) – IP Protocol 9
- *Enhanced Interior Gateway Routing Protocol (EIGRP) – IP Protocol 88
- Intermediate System-to-Intermediate System Protocol (IS-IS) – Runs natively on layer 2 of OSI model (Ethernet/PPP)
*Cisco proprietary
(Exterior Gateway Protocol)
Reliable transportation
- Border Gateway Protocol (BGP) – TCP port 179