| Publisher | RiverStone Networks | ||
|---|---|---|---|
| Format | HTML & PDF | Date added | 05 Jul 2002 |
| Topics | LAN - WAN Standards, VPNs, MPLS | ||
| Downloads | 293 | ||
Since there's been data networking, there's been a debate between switched and routed architectures - stated in OSI terms, between performing functions at Layer 3 or Layer 2. Today, we see it again surfacing as network architects consider the design of Virtual Private Networks (VPNs) that take advantage of Multi-Protocol Label Switching (MPLS). The question is, when are MPLS VPNs better implemented at Layer 3, using BGP-based VPNs, and when at Layer 2, using MPLS tunneling technologies?
The goal of this paper is to explain, in detail, what underlies the choice between Layer 2 and Layer 3 MPLS VPNs. Neither will always be the "right" choice for every service provider - the nature of existing network architectures and desired service offerings are what ultimately decide the matter. And, of course, some service providers may deploy both types of VPN, or salutary combinations of the two technologies.
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