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Layer 2 VPN Architectures by Anthony Chan, - CCIE No. 10,266, Dmitry Bokotey, - CCIE No. 4460, Carlos Pignataro, - CCIE No. 4619, Wei Luo, - CCIE No. 13,291

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Chapter 5. WAN Data-Link Protocols

This chapter covers the following topics:

Before proceeding with a detailed examination of Layer 2 Tunneling Protocol Version 3 (L2TPv3) and Any Transport over MPLS (AToM), it is critical to understand the protocols that these tunneling mechanisms transport. The four WAN data link layer protocols covered include High-Level Data Link Control (HDLC), PPP, Frame Relay, and ATM.

This chapter introduces specific components of these Layer 2 protocols that are relevant to the L2TPv3 and AToM pseudowire protocols explored later in this book. For each of these protocols, the chapter examines the encapsulation format, any ...

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