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VCC Cell Relay Encapsulation

E-series routers support virtual channel connection (VCC) cell relay encapsulation for ATM layer 2 services over MPLS. VCC cell relay encapsulation enables a router to emulate ATM switch behavior by forwarding individual ATM cells over an MPLS pseudowire (also referred to as an MPLS tunnel) created between two ATM VCCs, or as part of a local ATM cross connect between two ATM 1483 subinterfaces on the same router. The JUNOSe implementation conforms to the required N-to-1 cell mode encapsulation method described in the Martini draft, with the provision that only a single ATM virtual circuit (VC) can be mapped to an MPLS pseudowire.

VCC cell relay encapsulation is useful for voice-over-ATM applications that use ATM Adaptation Layer 2 (AAL2)–encapsulated voice transmission.

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