MPLS Service Usage
Page 168 7450 ESS MPLS Guide
MPLS Service Usage
Alcatel-Lucent routers enable service providers to deliver virtual private networks (VPNs) and
Internet access using Generic Routing Encapsulation (GRE) and/or MPLS tunnels, with Ethernet
and/or SONET/SDH 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 OS Services Guide. 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.
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