So we've spent the last few minutes having a look at some of the prerequisites for setting up multihoming. What we're going to do now is try some simple work examples. We're going to look at two cases--we're going to look at multihoming with the same ISP and then a bit later on we're going to look at multihoming two different ISPs. What I'm going to try and do here is keep the examples as simple as possible because understanding the easy concepts will make the more complex scenarios that we're going to look at later on easier to understand as well. Of all of these examples we're going to assume that the site multihoming has an IPv4 address block which is a slash 19 in size. These examples will work for all sizes of v4 and/or IPv6 address space but we're going to work through all these examples using just IPv4 and the assumption that the site that's multihoming has a slash 19. And so this type of basic multihoming is the most common found at the edge of the internet. Networks here are usually concerned with inbound traffic flows. Outbound traffic flows are usually nearest exit and that's quite often enough for most of these edge networks to deal with and this could apply for a leaf ISP or could apply for an enterprise network or university campus and so on. Later on in this series we're going to look at traffic engineering for outbound traffic but for now we will look just at inbound traffic flows.

© Produced by Philip Smith and the Network Startup Resource Center, through the University of Oregon.

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