wet-behind-the-ears whippersnapper seeking advice on building a nationwide network
rbf+nanog at panix.com
Tue Sep 20 21:19:19 UTC 2011
On Tue, Sep 20, 2011 at 04:13:57PM -0400, Dorn Hetzel wrote:
> "full time connection to two or more providers" should be satisfied when the
> network involved has (or has contracted for and will have) two or more
> connections that are diverse from each other at ANY point in their path
> between the end network location or locations and the far end BGP peers,
> whether or not the two or more connections are exposed to one or more common
> points of failure, as long as their are any failure modes for which one
> connection can provide protection against that failure mode somewhere in the
> other connection.
The GRE tunnel configuration being discussed in this thread passes this test.
Consider the following:
ISP #1 has transit connections to upstream A and B.
ISP #2 has transit connections to upstream C and D
ISP 1 and ISP 2 peer.
Customer gets a connection to ISP #1 and runs BGP, and, over that
connection, establishes a GRE tunnel to ISP #2, and runs BGP over that
I assume your last clause requires that each connection provide
protection against a failure more in the other connection (not just
that one of the two provide protection against a failure mode on the
other). This is satisfied. In my example:
ISP #1 provides protection against ISP #2 having a complete meltdown.
ISP #2 provides protection against ISP #1 losing both its upstream
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