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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