From: Ken Young (CiscoKid@ns.sympatico.ca)
Date: Sun Dec 16 2007 - 11:12:15 ART
MPLS/VPN Hub-and-spoke Topology
MPLS and VPN Architectures Page -242
-OR-
MPLS and VPN Architectures CCIP Edition Page -260
"In either case, it is necessary to define a hub site that contains full
routing knowledge of all spoke sites that belong to the same VPN. All
traffic from the spoke sites, destined either for the central site services
or for intersite connectivity, will flow through the central hub site. With
this type of topology, the spoke sites export their routes to the hub site,
and then the hub site re-exports the spoke site route through a second
interface (either physical or logical) using a different route target so
that other spoke sites can import the routes. This causes the hub site to
become a transit point for interspoke connectivity."
Can someone explain to my why this is done with a second connection?
Split-Horizon Rule maybe ??
Thanks,
Ken
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