General requirements for signaling across the Optical UNI (O-UNI) are discussed in . This draft describes extensions to the LDP protocol  to support those requirements. The LDP extensions described here address two areas:
- The addition of new TLVs to support the attributes required for lightpath establishment at the O-UNI
- Two new LDP messages to allow for the exchange of lightpath status information across the UNI.
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