EIGRP… The Basics

Enhanced Interior Gateway Routing Protocol (EIGRP) is an impressive set of features for IP Routing, which converges quickly and is on par and sometimes faster than OSPF. This routing protocol requires less processing time, less memory, and less network design than compared to OSPF. What’s the catch? This protocol is Cisco proprietary, if you have a network that uses non-Cisco routers, EIGRP will not and cannot be used on those routers. (Edit: Cisco has open this up to the IETF but you could still see issues if you found a vendor that supported EIGRP and not all features are supported***) EIGRP does not really fit into a specific spot of either Link-State or Distance vector, instead it stands on its own and is called hybrid routing protocol. Continue reading “EIGRP… The Basics”

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OSPF…What a Protocol!

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.

Continue reading “OSPF…What a Protocol!”

Link-State Protocols

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”

Distance Vector Routing

Couple weeks ago I talked about routing protocols and in the post I mentioned two routing protocol features distance vector and link state. Although these protocols fundamentally do the same thing by getting information on remote networks they get this information in a different way. For today let’s introduce distance vector routing. Continue reading “Distance Vector Routing”

Classful vs. Classless Routing

Before the internet and general networking become popular into what it is now, there were and still are routing protocols that only do classful routing. What is classful routing? When I was talking about Dynamic Routing earlier (See the post Dynamic Routing Protocols) I mentioned there was a difference between classful routing and classless routing. So in today’s post let’s focus on these two but important topics when using routing protocols. Continue reading “Classful vs. Classless Routing”