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method
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... VPNs) for its
customers. This method uses a "peer model", in which the customers'
edge routers (CE routers) send their routes to the Service Provider ...
... VPN routes.
The primary goal of this method is to support the case in which a
client obtains IP backbone ...
... Internet Service Provider, an application service
provider, another VPN Service Provider that uses this same method to
offer VPNs to clients ...
... offer VPNs to clients of its own, etc. The method makes it very
simple for the client to use the backbone ...
... VPN to gain access to systems in another VPN. Of
course, the methods described herein do not by themselves encrypt the
data for privacy ...
... VRFs
depends on the decision process of the routing method used between
the PE and those CEs ...
... Target.
Thus, the methods for controlling the distribution of routing
information among various sets of sites are very flexible, which in
turn provides great flexibility in constructing VPNs ...
... label switched paths across the backbone. However, other methods
of setting up these label switched paths ...
... setting up these label switched paths are also possible.
(Some of these other methods may not require the presence of the
/32 address prefixes in the IGP ...
... service from another SP, the
"carrier's carrier", using essentially the same methods described in
this document. However, it is necessary in these cases that the CE
routers support MPLS ...