Summary
This chapter examined how L2TPv3 emulates LAN protocols. The first section began with an exploration of the l2tp-class, pseudowire-class, and xconnect syntax. This CLI introduction served as the basis for examining the two modes of Ethernet emulation L2TPv3 supports: port-to-port emulation and VLAN-to-VLAN emulation.Following are several key aspects to take away from this chapter:The l2tp-class definition serves as a template for the L2TP control channel. pseudowire-class templates contain session attributes. The xconnect statements bind attachment circuits to the necessary pseudowire.You can configure L2TPv3 pseudowires for manual mode, manual mode with keepalive, and dynamic mode. Although these modes were shown in the Ethernet port-to-port model only, they are relevant for any L2TPv3 LAN and WAN session type.An Ethernet port-to-port session emulates any frame that is received on the respective PE ports and transports it to the far-end device transparently. The payload could be tagged or untagged depending on the CE devices.An Ethernet VLAN-to-VLAN session emulates any frame that is received on the respective VLAN to the far-end PE. If the VLAN ID values on the attachment circuit do not match, the remote PE has the responsibilty of performing VLAN header rewrite.
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