Nokia 7705 SAR-W Series Manual page 374

Label Distribution Protocol
5.1.4.2.1
In the 7705 SAR, adjacency management is done through the establishment of a
Service Destination Point (SDP) object, which is a service entity in the Nokia service
model.
The service model uses logical entities that interact to provide a service. The service
model requires the service provider to create and configure four main entities:
An SDP is the network-side termination point for a tunnel to a remote 7705 SAR or
77x0 SR router. An SDP defines a local entity that includes the system IP address of
the remote 7705 SAR routers and 77x0 SR routers, and a path type.
Each SDP comprises:
If the SDP is identified as using LDP signaling, then an LDP extended hello
adjacency is attempted.
If another SDP is created to the same remote destination and if LDP signaling is
enabled, no further action is taken, since only one adjacency and one LDP session
exists between the pair of nodes.
An SDP is a unidirectional object, so a pair of SDPs pointing at each other must be
configured in order for an LDP adjacency to be established. Once an adjacency is
established, it is maintained through periodic hello messages.
5.1.4.2.2
When the LDP adjacency is established, the session setup follows as per the LDP
specification. Initialization and keepalive messages complete the session setup,
followed by address messages to exchange all interface IP addresses. Periodic
keepalives or other session messages maintain the session liveness.
374
Adjacency Establishment
• customers
• services
• Service Access Points (SAPs) on local 7705 SAR routers
• SDPs that connect to one or more remote 7705 SAR routers or 77x0 SR routers
• the SDP ID
• the transport encapsulation type, MPLS
• the far-end system IP address
Session Establishment
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MPLS Guide
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