The router supports ATM PVC service encapsulation for VPRN SAPs on the 7750 SR only. Both UNI and NNI cell formats are supported. The format is configurable on a SONET/SDH path basis. A path maps to an ATM VC. All VCs on a path must use the same cell format.
The following ATM encapsulation and transport modes are supported:
RFC 2684, Multiprotocol Encapsulation over ATM Adaptation Layer 5:
AAL5 LLC/SNAP IPv4 routed
AAL5 VC mux IPv4 routed
AAL5 LLC/SNAP IPv4 bridged
AAL5 VC mux IPv4 bridged