Introduction - Alcatel-Lucent 7750 SR Manual

Introduction

A service is a globally unique entity that refers to a type of connectivity service for either Internet
or VPN connectivity. Each service is uniquely identified by a service ID and an optional service
name within a service area. The SR-Series service model uses logical service entities to construct a
service. In the service model, logical service entities provide a uniform, service-centric
configuration, management, and billing model for service provisioning.
In the SR-Serieservices can provide Layer 2/bridged service or Layer3/IP routed connectivity
between a service access point (SAP) on one router and another service access point (a SAP is
where traffic enters and exits the service) on the same (local) router or another router (distributed).
A distributed service spans more than one router.
Distributed services use service distribution points (SDPs) to direct traffic to another SR-Series
through a service tunnel. SDPs are created on each participating router, specifying the origination
address (the router participating in the service communication) and the destination address of
another router. SDPs are then bound to a specific customer service. Without the binding process,
far-end router is not able to participate in the service (there is no service without associating an
SDP with a service).
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