Summary
In this chapter, you saw that the base MPLS VPN architecture might not provide all of the functionality you need for certain deployment scenarios. So that you can meet the connectivity requirements for these scenarios, Cisco Systems Inc. has introduced the Carrier's Carrier and InterAS solutions.
To ease the burden of large routing tables at the PE routers, you can use the Carrier's Carrier architecture so that external routes are exchanged directly between customer sites. Any internal routes such as BGP next-hops, server addresses, and so on are exchanged with the MPLS VPN backbone.
You can establish connectivity within a VPN that can span multiple service provider footprints by using the InterAS architecture. Several options exist within ...
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