EIGRP Question

billscott92787

Hey guys,


Looking for some help to clear up a confusion that I have. There are two books I have currently read. ICDN1 and Routing Protocols and Concepts. Both Cisco Books. The Routing Protocols book says that EIGRP is NOT considered hybrid anymore that it is referred to as distance vector. In the ICND1 book, it is referred to as hybrid still. So, which is it? I just want to clarify it for future testing.

mikej412

I call EIGRP lots of things...... and most of them are too rude to post here

It's a Distance Vector Protocol with some added features to compete better against the the Link-State Protocols, so the marketing wonks called it a Hybrid Protocol. Calling it an Advanced Distance Vector Protocol is probably more accurate.

I doubt you'll get a question like
What is EIGRP?
A. A link-state routing protocol
B. A distance vector routing protocol
C. An advanced distance vector routing protocol
D. A hybrid protocol

billscott92787

Thanks mike

adam-b

I believe that the classical definition, in short, of a link state vs distance vector protocol is as follows.

distance vector: routers will advertise to their neighbors all of the routes in their routing table. Routers will only know what networks their directly connected neighbors can reach.

link state: routers will know what networks are directly connected to every other router within the topology or "area." So advertisements are not based upon what routes are in the routing table but on what networks are directly connected.

This is the easiest way for me to understand it.

bubble2005

All I can say is limit the amount of books you read because each author will have their own opinion of what it is, but when it all dwells down to that test, buddy, there will only be one answer. I got confused just like that on the Security + exam.

mella060

I often see it referred to as an advanced distance vector protocol that has a lot of features of link state protocols.

adam-b

mella060 wrote: »

I often see it referred to as an advanced distance vector protocol that has a lot of features of link state protocols.

What features of link state protocols does it have?

jscimeca715

It keeps a topology table and forms neighbor relationships. Those are two big Link State comparisons. It also has pretty fast convergence as well.

wbosher

mikej412 wrote: »

I doubt you'll get a question like
What is EIGRP?
A. A link-state routing protocol
B. A distance vector routing protocol
C. An advanced distance vector routing protocol
D. A hybrid protocol

Wouldn't it be funny if there was a question like that on the exam. Mike, you would have to moderate you own post!