We skip the switches completely, as they are only there to make it possible to not use any crossover cables in this (and many other) labs. After adding the three routers, add two Cloud units, they will be our simulated PC:s. I use the “Router c2600” with a “” IOS image. The first thing we do is add the three routers, using a model, with an IOS image that you have already configured. Choose an appropriate name, like “testlab_ppp”, remember to check the “Export router configuration files” checkbox. Upon start we are asked to either name, and create a new project, or open an existing one. When starting GNS3 we have an empty working space. This is the topology that we will use, as shown in the CCNA4 curriculum lab manual. When you have a router set up and configured with an IDLE PC value that doesn’t consume all your processor cycles, continue building the topology in GNS3, as follows. Also remember to add a WIC-2T card to the router, or make sure it has two serial interfaces. Read the “Creating the Simplest Topology” section of the PDF linked above to learn how to accomplish that. The first thing you should do is following the documentation of GNS3, to set up a router with an IOS image, and set it’s IDLE PC value.
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