Service Distribution Points (Sdps); Sdp Binding - Alcatel-Lucent 7210 SAS M Service Manual

Service Distribution Points (SDPs)

Note: SDPs are not supported by 7210 SAS-M devices configured in Access Uplink mode.
A service distribution point (SDP) acts as a logical way to direct traffic from one router to another
through a uni-directional (one-way) service tunnel. The SDP terminates at the far-end device
which directs packets to the correct service egress SAPs on that device. 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 the service to the service tunnel.
An SDP has the following characteristics:
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An SDP from the local device to a far-end router requires a return path SDP from the far-end 7210
SAS-Series back to the local router. Each device must have an SDP defined for every remote
router to which it wants to provide service. SDPs must be created first, before a distributed service
can be configured.

SDP Binding

To configure a distributed service from ALA-A to ALA-B, the SDP ID (1) must be specified in
the service creation process in order to "bind" the service to the tunnel (the SDP). Otherwise,
service traffic is not directed to a far-end point and the far-end device(s) cannot participate in the
service (there is no service). To configure a distributed service from ALA-B to ALA-A, the SDP
ID (5) must be specified.
7210 SAS M Services Guide
An SDP is locally unique to a participating routers. The same SDP ID can appear on other
7210 SAS-Series routers.
An SDP uses the system IP address to identify the far-end edge router.
An SDP is not specific to any one service or 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 mapped to an SDP use the same transport encapsulation type defined for the
SDP.
An SDP is a management entity. Even though the SDP configuration and the services
carried within 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
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