Page 202 7750 SR OS Services Guide
Figure 40 depicts an application of a Frame Relay VLL. The Frame Relay VLL (Fpipe) provides a
point-to-point Frame Relay service between users connected to 7750 nodes on the IP/MPLS
network. Users are connected to the 7750 PE nodes using Frame Relay PVCs. PE1, PE2, and PE3
receive a standard Q.922 Core frame on the Frame Relay SAP and encapsulate it into a pseudowire
packet according to the 1-to-1 Frame Relay encapsulation mode in draft-ietf-pwe3-frame-relay-
xx.txt, Encapsulation Methods for Transport of Frame Relay Over MPLS Networks. The 7750
Frame Relay VLL feature supports local cross-connecting when the users are attached to the same
7750 PE node.
The FR pseudowire is initiated using Targeted LDP (TLDP) signaling as specified in draft-ietf-
pwe3-control-protocol-xx.txt, Pseudowire Setup and Maintenance using LDP. The SDP can be an
MPLS or a GRE type.
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