This document discusses three types of L2 Virtual Service Networks (L2VSNs) - UNI type, switched, and transparent. The UNI type assigns each endpoint a unique identifier of port and VLAN. The switched type maps an entire VLAN to a single I-SID. The transparent type sends all traffic from a port to a single I-SID regardless of VLAN. It provides examples of creating an L2VSN and checking connectivity across it.