For today let’s discuss a routing protocol that was being thought of in 1987 by the Internet Engineering Task Force (IETF). OSPF currently has three versions and the first version was in the 1980s when the internet was still being used for research. What is interesting about the first version of OSPF is although one version ran on routers the other type of version ran on UNIX computers. When OSPFv2 come out in the 1990s the International Organization for Standardization (ISO) was working on another routing protocol called IS-IS (Intermediate System-to-Intermediate System). OSPF is considered to be an interior gateway protocol which is like IS-IS but unlike OSPF IS-IS runs on the data-link layer while OSPF runs at layer three the network layer.
Weeks ago and maybe months :), I talked about distance vector protocols and with that you probably got the feeling that when using a distance vector protocol it does not give a full network graphical representation of the entire network. Only the directly connected routes can’t remember? Check out this post Distance Vector Routing. Link state protocols are faster to converge network changes compared to distance vector however when compared to distance vector setup they can be harder to set up, maintain, and troubleshoot when problems arise. Continue reading “Link-State Protocols”