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 also. 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 connections. -- Brett