Summary
This chapter explored various L2TPv3 advanced concepts and topics through the use of case studies. It covered the detailed theoretical and practical operation of PMTUD in L2TPv3. It also highlighted the more theoretical aspects of MTU handling and PMTUD with "the life of a packet" scenarios and figures both with and without PMTUD. When you are adding encapsulation headers to an SDU, MTU and fragmentations issues arise in the IP PSN. PMTUD combined with DF bit setting provides a practical approach to solving the core MTU and IP reassembly processing problems.You learned the control plane and data plane considerations of ATM OAM cell emulation and ATM cell packing. New L2TPv3 AVPs were presented detailing their use, functionality, and interaction.In the final few pages of this chapter, you learned QoS essentials, configuration, and QoS particulars regarding L2TPv3. You saw how to configure and apply traffic marking, policing, queuing, shaping, and advanced QoS matching and setting criteria for each Layer 2 technology that is tunneled and transported using L2TPv3. |
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