So this series is now going to look at
the BGP best current practices. The best
current practices covered here have been
accumulated over the years from network
operators who have shared their
experiences: what they've been doing, how
they configure BGP which should be
optimally configured and optimally
operated in the network. As the internet
grows and develops what we've considered
as best practices for BGP have grown and
developed as well. Even though BGP is
very old protocol, the industry and the
community are always finding better ways
of improving the efficiency and the
scalability of BGP.
And we're going to look at some of these
as we work through the next set of
slides. So when we start off we need to
first look at how we go about
configuring BGP. Most network operators
today consider templating a very, very
important part of the network deployment
and network infrastructure. So on the
screen you see a typical basic template
that somebody might be using for Cisco IOS.
For Cisco IOS you'd set up a BGP
template with your AS number, you would
configure deterministic MED, as we've
covered in attribute presentation,
to make BGP behavior on Cisco IOS the same
as for other vendors you turn off
Cisco's default assumption that all
neighbors will exchange IPv4 prefixes.
This is peculiar to Cisco IOS and you
don't find it in other implementations.
You would also make BGP's protocol
distance greater than that of any other
protocol and make sure that eBGP's
distance is at least the same as that of iBGP.
Most operators still use some very old
Cisco configuration called "no
synchronization" and "no auto summary".
These still stick in templates even though
they're now default in Cisco IOS.
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