So what do we mean when we talk about multi-homing? We've seen, up to now we've talked about, getting two connections to upstream providers. Multi-homing means that we have more than one link external to the local network. Now this could be two or more links to the same ISP, or it could be two or more links to different ISPs. And we're usually using two external facing routers, back to the "two of everything". We can multi-home with one router and that gives us link and provider redundancy. But remember we're now back to being entirely dependent on that single router, the software, the hardware, and the configuration on it. So multi-homing means two or more links to the same ISP, or two or more links to different ISPs. And the examples in the rest of this presentation will cover looking at links from the local network to at least two other networks.
© Produced by Philip Smith and the Network Startup Resource Center, through the University of Oregon.
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