General requirements for signaling across the Optical UNI (O-UNI) are discussed in [1]. This draft describes extensions to the LDP protocol [2] 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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