EdTheLad wrote: » OSPF is a link state protocol, it creates a link state update and sends it to its neighbors. This update will describe all the local interfaces ip prefixes with associated costs. Why would split-horizon be required if a router is only advertising it's own networks? All ospf routers within an area will create a type 1 lsa which gets flooded unaltered throughout the area. The only routing by rumor type behavior in ospf is at the ABR, to avoid implementing loop control mechanisms like split horizon between area's, ospf is designed with a backbone area, area's can only communicate via the backbone, which makes the area connectivity hub and spoke like. Eigrp is distance vector which means it advertises it complete routing table to neighbors, split-horizon basically means, if i learned a route from you i wont advertise the route back to you i.e. i wont create a loop. Hello/Dead timers are used for neighbor communications.
hurricane1091 wrote: » I get too deep into thought about these things lol. Thanks for the reply guys. I understood the EIGRP part but OSPF was confusing me. If R1 was a higher OSPF priority than R2, and R3 had a higher OSPR priority than R2, R2 would then have 2 DRs. Something about that was confusing me. I drew some diagrams out on my desk that I think helped.
