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MPLS Service Usage
Alcatel-Lucent routers enable service providers to deliver virtual private networks (VPNs) and
Internet access using Generic Routing Encapsulation (GRE) and/orMPLS tunnels, with Ethernet
interfaces.
Service Distribution Paths
A service distribution path (SDP) acts as a logical way of directing traffic from one router to
another through a uni-directional (one-way) service tunnel. The SDP terminates at the far-end
router which directs packets to the correct service egress service access point (SAP) on that
device. All services mapped to an SDP use the same transport encapsulation type defined for the
SDP (either GRE or MPLS).
For information about service transport tunnels, refer to the Service Distribution Paths (SDPs)
section in the O. They can support up to eight forwarding classes and can be used by multiple
services. Multiple LSPs with the same destination can be used to load-balance traffic.
7950 SR OS MPLS Configuration Guide
MPLS and RSVP
Page 113
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