77th IETF – Anaheim, March 2010 PCEP Extensions in support of WSON Signal Compatibility Constraints Young Huawei Greg Grotto Networking Jonas Martensson Acreo Takehiro KDDI

77th IETF – Anaheim, March 2010 Motivation/Background  Signal compatibility is an essential path computation constraint in path computation of WSON networks where network elements can be limited to processing WSON signals with specific characteristics and attributes.  Signal compatibility framework has been adopted into the current CCAMP WSON framework.  OSPF extension to support signal compatibility has been adopted as a CCAMP WG item in Hiroshima IETF: draft-ietf-ccamp-wson-signal-compatibility- ospf-01.txt

77th IETF – Anaheim, March 2010 Signal Compatibility Constraints  On a high-level the following network element information would be required for the path computation element (PCE) to be able to compute a constrained path that satisfies signal compatibility and processing constraints: Input Compatibility: the type of signals it can receive (modulation types, rate, FEC types) Regeneration Capability: the types of processing/enhancement it can perform (1R, 2R, 3R) The types of conversions it can perform (modulation types, FEC types) Output Format: the type of signals it can transmit (modulation types, rate, FEC types)

77th IETF – Anaheim, March 2010 Requirement #1  When requesting a path computation (PCReq) to PCE, the PCC should be able to indicate the following: The acceptable signal attributes at the transmitter (at the source): (i) modulation types; (ii) FEC types The acceptable signal attributes at the receiver (at the sink): (i) modulation types; (ii) FEC types The GPID type of an LSP (This might have already been fulfilled in PCEP enhancements for GMPLS)

77th IETF – Anaheim, March 2010 Requirements #2  The PCE should be able to respond (PC Rep) to the PCC with the following: The conformity of the requested optical characteristics associated with the resulting LSP with the source, sink and NE along the LSP. Additional LSP attributes modified along the path (e.g., modulation format change, etc.) Special node processing with the resulting LSP (e.g., regeneration point) (New) A list of Modulation/FEC types (per node identifier) in the ERO object (or other suitable mechanism) in the case when more than one is compatible with all constraints

77th IETF – Anaheim, March 2010 Summary & Next Steps  Adopt as a PCE WG document  Solicit more requirements and refine encoding