Summary
In this chapter, you learned specifics about the transport of Layer 2 WAN protocols over MPLS using AToM. In particular, this chapter presented theory, configuration, and verification of the transport of several WAN protocols over MPLS. The underlying control plane concept is the same as with Ethernet over MPLS (EoMPLS); however, many encapsulation specifics are based on the martini drafts when adapting AToM to the transport of HDLC, PPP, Frame Relay DLCIs, ATM AAL5 SDUs, and ATM cells.This chapter discussed the importance of the MTU setting both in the edge devices and the core. For all WAN protocol transport over MPLS except the transport of ATM cells, a pseudowire requires matching MTUs in both ends for it to come up. Even when matching MTUs in the attachment circuits enable control plane success, a conscientious MTU setting in the core is required to avoid data plane problems.This chapter concluded with four additional case studies. In these case studies, you learned what the exact format of LDP label mapping messages is, how to check for hardware capabilities on a router, and how to decouple the platform specifics. You also learned about packed cell relay over MPLS and the ins and outs of ATMoMPLS VC mode, including a detailed comparison of three different ways of transporting an ATM VC using AToM. |
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