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JUNOS Automation Cookbook by Adam Chappell

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BGP MPLS VPN primer

BGP-based MPLS VPNs were first specified in IETF RFC 2547 in 1999. MPLS VPN technology spent the early 2000s competing hard with legacy private network technologies such as ATM/Frame Relay and overlay IPSec-based networks. It finally established ground as the most technically viable and cost-effective way for a service-provider network to logically partition his physical network into private routing instances for use by customers.

Under the hood, the service-provider's typical BGP topology is augmented with an extra address family that widens the address space field in order to carry a route distinguisher—something to distinguish one customer's private address space from another's. In addition to the route distinguisher, ...

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