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LDP Extensions for Pseudo Wire (PW) Transfer in an MPLS-TP Network

LDP Extensions for Pseudo Wire (PW) Transfer in an MPLS-TP Network. draft-bao-pwe3-pw-transfer-00.txt. Yuanlin Bao: bao.yuanlin@zte.com.cn Lizhong Jin: lizhong.jin@zte.com.cn Ruiquan Jing: jingrq@ctbri.com.cn Xiaoli Huo: huoxl@ctbri.com.cn. Background. Merged the following drafts

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LDP Extensions for Pseudo Wire (PW) Transfer in an MPLS-TP Network

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  1. LDP Extensions for Pseudo Wire (PW) Transfer in an MPLS-TP Network • draft-bao-pwe3-pw-transfer-00.txt Yuanlin Bao: bao.yuanlin@zte.com.cn Lizhong Jin: lizhong.jin@zte.com.cn Ruiquan Jing: jingrq@ctbri.com.cn Xiaoli Huo: huoxl@ctbri.com.cn

  2. Background • Merged the following drafts • draft-bao-mpls-tp-path-transfer-reqs-00.txt • presented on the 77th meeting • disscussed in MPLS mailing list • draft-fuxh-mpls-tp-transfer-framework-00.txt • presented on the 77th meeting • draft-bao-pwe3-pw-transfer-ldp-ext • Contents of this draft • discusses the advantage compared with MBB • LDP extensions and procedures • the PW Transfer Capability TLV • PW Ownership Transfer TLV • S-PE TLV and Sub-TLV (draft-ietf-pwe3-segmented-pw)

  3. Comparison with Make Before Break(MBB)

  4. Requirements • Requirements • Requirement 55 of RFC5654 • draft-ietf-ccamp-mpls-tp-cp-framework-03.txt • Requirement 47 • Section 5.3.3 • Requirements in RFC5493 also apply • Additional requirements • PW attributes MUST not be changed • PW transfer MUST be independent of LSP • Support partial MS-PW segments transfer

  5. LDP Extension • PW Transfer Capability TLV 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|0|PW Transfer Capability(TBD)| Length (= 1) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1| Reserved | +-+-+-+-+-+-+-+-+ • Carried in LDP Initialization Message (RFC5561) • Negotiating the PW transfer capability between LDP Peers • PW switching point TLV (S-PE TLV) and Sub-TLV • defined in draft-ietf-pwe3-segmented-pw • used to carry the data plane PW path

  6. LDP Extension (cont.) • PW Ownership TransferTLV • Carried in LDP Label Mapping and Notification message • 0 1 2 3 • 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • |0|0| PW Transfer | Length | • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • |POT| Reserved | • +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • POT(2 bits): PW Ownership Transfer • 1 - PW ownership transfer from MP to CP • 2 - PW ownership transfer from CP to MP

  7. MP to CP Transfer Procedure(SS-PW) • T-PEs • Negotiate PW transfer capability • Send/Receive Label Mapping message with PW Transfer TLV • Create/Maintain PW signaling state in CP

  8. MP to CP Transfer Procedure (MS-PW) • T-PEs • Perform all the procedures in MP2CP SS-PW transfer plus • encoding PW path into S-PE TLV and Sub-TLV • S-PEs • create PW LDP signaling state in CP • decode the S-PE TLV and Sub-TLV to find the next hop • forward Label Mapping message to the next hop

  9. CP to MP Transfer Procedure • T-PEs • send CP2MP PW transfer Notification message • delete T-LDP session according to the local policy • S-PEs • forward Notification message • delete T-LDP session according to the local policy

  10. Next Steps • Refine the document according to the feedback of this meeting and mailing list.

  11. Comments ? Thank you !

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