3. PW encapsulations

3.1 PW ATM [RFC4717]

The ATM protocol can be implemented directly with ATM switches, in which case we speak of an ATM infrastructure, or alternatively via IP/MPLS routers supporting the PW function. The ATM network is considered one of the first backbone networks in the multiservice sense, capable of transporting different types of traffic (Ethernet, IP, MPLS, TDM) with the required quality of service.

In the following paragraphs, we describe how ATM cells are encapsulated on the Pseudowire emulation layer. The IETF has defined several encapsulation procedures:...