[ih] Exterior Gateway Protocol

[vinton cerf]

It felt like a layer violation to run BGP over TCP but in fact it proved to
be very useful.

v


On Fri, Sep 4, 2020 at 7:36 AM Scott Brim via Internet-history <
internet-history at elists.isoc.org> wrote:

> On Fri, Sep 4, 2020 at 1:29 AM Joseph Touch <touch at strayalpha.com> wrote:
>
> > On Sep 2, 2020, at 2:33 PM, Guy Almes via Internet-history <
> > internet-history at elists.isoc.org> wrote:
> > ...
> >  As Vint just reminded me, not only was the variable length AS path an
> > unusual characteristic, but BGP's use of TCP was quite controversial.
> But,
> > in addition to other advantages, the use of TCP made possible several
> early
> > implementations.
> >
> >
> > Can you tell us more about what part of BGP’s use of TCP was
> controversial
> > at the time?
> >
> > I.e., other than the error of linking “this path is up” inside BGP to
> “TCP
> > is stable over that path”, a decision that required multiple fixes to
> > address (MD5, TCP-AO, RST rejection, and route dampening).
> >
>
> Layering. You're setting up a connection to a node in a different AS, so
> you needed AS-level routing to tell you the path, so you need BGP so etc.
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