Layer 2 Vpn Architectures [Electronic resources] نسخه متنی

Chapter 13. Advanced L2TPv3 Case Studies

L2TPv3 path MTU discovery

Advanced ATM transport over L2TPv3

Quality of service

This chapter concentrates on advanced concepts and techniques in Layer 2 Tunnel Protocol Version 3 (L2TPv3) transport deployments. Building from the concepts and configurations covered in Chapters 10, "Understanding L2TPv3," through 12, "WAN Protocols over L2TPv3 Case Studies," this chapter covers diverse topics and case studies that involve a higher degree of complexity than previous chapters. Because the advanced deployment scenarios cover a wide range of concepts, the format of this chapter varies somewhat from other case study chapters.

This chapter starts by explaining path maximum transmission unit discovery (PMTUD), the problem it solves, the rationale behind its operation, and multiple examples. You learn details about combining PMTUD with setting the DF bit in the delivery header.

This chapter also covers two advanced cases of ATM over L2TPv3: ATM Operation, Administration, and Maintenance (OAM) emulation and ATM cell packing. This chapter concludes by describing quality of service (QoS) in L2TPv3 and explaining configuration examples.