OSPF Auto Cost Reference Bandwidth
Scenario: The new muppet movie is almost finished. All the actresses prefer to have a dedicated internet connection in their trailers at the movie park. You configure a couple of routers with Gigabit and FastEthernet interfaces. Unfortunately OSPF…
Read More »OSPF DR BDR Election
Scenario: You end up working as one of the network engineers for a nuclear powerplant located in a cartoony looking town. OSPF is being used as the IGP routing protocol but there have been some problems with the…
Read More »EIGRP Timers
Scenario: You are the network engineer for a fairly large international operating company. One of the trainees in the company is studying for his CCNA and decided to practice on some of the company routers. EIGRP is now…
Read More »EIGRP Summarization without Null0
Scenario: You are applying for a job as a senior network engineer at a large ISP. They heard you passed your CCIE so they want to test you by giving a topology with an EIGRP summarization question. Let’s…
Read More »EIGRP Summarization Leak-Map
Scenario: The movie industry is dominated by Holly- and Bollywood. Recently the two companies are creating movies together and using a shared network infrastructure. To make sure the routing tables of the EIGRP routes don’t grow too much…
Read More »EIGRP Router ID
Scenario: Your colleague asks for your help with a strange EIGRP problem. He redistributed a network into EIGRP but for some reason it doesn’t show up in the routing table of one of the routers. You verify the…
Read More »ODR (On Demand Routing)
Scenario: The international network of the Benelux doesn’t have any more fancy equipment since the last cost saving project. The current routers don’t support any routing protocol except ODR (On Demand Routing). You don’t want to use static…
Read More »Recursive Routing Failure
Scenario: You work as the network engineer for a company with an ambitious plan to build a tunnel between Japan and Australia. To support this project you have to configure the network with some new routers. You configure…
Read More »Reliable Static Routing Backup using Object Tracking
Scenario: You are looking at a small network with a HQ and Branch router. At the HQ there is a webserver located and many users from the branch office are accessing this webserver. Between HQ and Branch there…
Read More »Backup Interface
Scenario: You are responsible for a number of routers of a network that connects multiple cities. Whenever router Barcelona sends traffic towards Boston it has to use the link to Tilburg. Unfortunately it is load balancing since the…
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