In OTNs using overlay model, clients request network services
through a user network interface (UNI). This draft describes LDP
necessary extensions for signaling support across the optical UNI (O-UNI). LDP extensions are those needed to satisfy the main
functions supported at the O-UNI. Those functions are: connection
create, connection delete, connection modify, and connection status enquiry.
In an overlay network architecture such as the ITU-T automatic
switched OTN (ASTN), there is a clear boundary between the
client and the network layers. Routing and topological information
does not cross this boundary in the sense that each layer is running
its own instant of a routing protocol, e.g. OSPF or entirely
different routing protocols. Network clients request network
services, e.g. connections, across a well-defined interface. This
interface is generally called the optical user network interface (O-
UNI).
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