Service Destination Points (Sdps) - Alcatel-Lucent 7705 Service Manual

Service Destination Points (SDPs)

An SDP identifies the endpoint of a logical unidirectional service tunnel. The service tunnel
provides a path from one 7705 SAR to another network device, such as another 7705 SAR, a
7710 SR, or a 7750 SR.
In more general terms, SDP refers to the service tunnel itself. The SDP terminates at the far-
end router, which is responsible for directing the flow of packets to the correct service egress
SAPs on that device.
Note: In this document and in command line interface (CLI) usage, SDP is defined as
Service Destination Point. However, it is not uncommon to find the term SDP defined in
several different ways, as in the following list. All variations of SDP have the same meaning:
•
•
•
•
•
When an SDP is bound to a service, the service is referred to as a distributed service. A
distributed service consists of a configuration with at least one SAP on a local node, one
SAP on a remote node, and an SDP binding that binds the service to the service tunnel.
An SDP has the following characteristics.
7705 SAR OS Services Guide
Service Destination Point
Service Distribution Point
Service Destination Path
Service Distribution Path
Service Delivery Path
• An SDP is locally unique to a participating 7705 SAR. The same SDP ID can appear
on other 7705 SAR routers.
• An SDP uses the system IP address of the far-end edge router to locate its
destination.
• An SDP is not specific to any one service or to any type of service. Once an SDP is
created, services are bound to the SDP. An SDP can also have more than one service
type associated with it.
• All services bound to an SDP use the same SDP (transport) encapsulation type
defined for the SDP (GRE, IP, or MPLS).
• An SDP is a service entity used for service management. Even though the SDP
configuration and the services carried within it are independent, they are related
objects. Operations on the SDP affect all the services associated with the SDP. For
example, the operational and administrative state of an SDP controls the state of
services bound to the SDP.
Services Overview
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