In this clip we will discuss where a
national research and education network
will need to use BGP. There are two basic
models of service for NRENs that we've
seen around the world. A peering network
that provides a limited set of routes,
that does not provide complete internet
access. The peering NREN provides
routes that will exchange traffic
between connected members and to the
rest of the global research and
education networking community.
It might also provide routes to a local internet
exchange that will move traffic to
customers of those local internet
exchange service providers, to Google and
other services that are present at the
exchange point. A more common model is
that the NREN provides complete
internet access including optimized
routes to the global research and
education networking community.
When the NREN is a peering network you can
see that the NREN must have provider
independent address space on all
external router interfaces including
those connected to the internet exchange,
other RENs and connected university members.
When the REN acts as an ISP you
can see that the REN not only
connects to the REN ecosystem, but it
will also purchase Internet service from
an Internet service provider. In this
case the NREN must have provider
independent address space configured on
all external router interfaces
connecting to the upstream providers
including the ISPs, internet exchanges
and other RENs. In our experience most
NRENs around the world provide full
internet access. There are only a few
that we've seen that do peering only.
They have found that a peering only
network is the easiest to implement from
a political perspective. Often ISPs are
threatened by NRENs. They will lobby
against the formation of the NREN and
do whatever they can to subvert the
formation of the NREN. However, when the
NREN is a peering only network it
makes it much more difficult for the
individual members that are served by
the NREN when the NREN is a peering
at work it means that the NREN only
provides connectivity to a portion of
the internet so that connected members
must have a second connection to an
Internet service provider so that they
have full access to the internet. Using
these two connections is not simple.
It is not like having two ISP connections
that can be used as a redundant backup
or load-balanced. It requires BGP at the
campus level to make it work right.
We will explore the campus use of BGP
in a separate video clip.
© Produced by Philip Smith and the Network Startup Resource Center, through the University of Oregon.
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