Introduction; Service Types - Alcatel-Lucent 7750 SR OS Service Manual

Introduction

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 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.
Services can provide Layer 2/bridged service or Layer3/IP routed connectivity between a service
access point (SAP) on one SR-Series router and another service access point (a SAP is where
traffic enters and exits the service) on the same (local) or another SR-Series 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 SR-Series, specifying the
origination address (the SR-Series router participating in the service communication) and the
destination address of another SR-Series. SDPs are then bound to a specific customer service.
Without the binding process, far-end SR-Series devices are not able to participate in the service
(there is no service without associating an SDP with a service).

Service Types

The SR-Series offers the following types of subscriber services which are described in more detail
in the referenced chapters:
•
•
Page 26
Virtual Leased Line (VLL) services:
→ Ethernet pipe (Epipe) — A Layer 2 point-to-point VLL service for Ethernet frames.
See Ethernet Pipe (Epipe) Services on page
→ ATM VLL (Apipe) — A point-to-point ATM service between users connected to 7750
nodes on an IP/MPLS network. See
170.
→ Frame-Relay (Fpipe) — A point-to-point Frame Relay service between users
connected to 7750 nodes on the IP/MPLS network. See
Service Overview on page
→ IP Pipe (Ipipe) — Provides IP connectivity between a host attached to a point-to-point
access circuit (FR, ATM, PPP) with routed IPv4 encapsulation and a host attached to
an Ethernet interface. See
Virtual Private LAN Service (VPLS) — A Layer 2 multipoint-to-multipoint VPN. See
Virtual Private LAN Service on page
which is an enhancement of VPLS which extends Martini-style signaled or static virtual
circuit labeling outside the fully meshed VPLS core.
110.
ATM VLL (Apipe) Service Overview on page
172.
IP Interworking VLL (Ipipe) Overview on page
323. VPLS includes Hierarchical VPLS (H-VPLS)
7750 SR OS Services Guide
Frame Relay VLL (Fpipe)
178.