Ldp extensions for pseudo wire pw transfer in an mpls tp network
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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

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


Ldp extensions for pseudo wire pw transfer in an mpls tp network

Background Network

  • 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)



Requirements
Requirements Network

  • 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


Ldp extension
LDP Extension Network

  • 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


Ldp extension cont
LDP Extension (cont.) Network

  • 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


Mp to cp transfer procedure ss pw
MP to CP Transfer Procedure(SS-PW) Network

  • T-PEs

    • Negotiate PW transfer capability

    • Send/Receive Label Mapping message with PW Transfer TLV

    • Create/Maintain PW signaling state in CP


Mp to cp transfer procedure ms pw
MP to CP Transfer Procedure (MS-PW) Network

  • 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


Cp to mp transfer procedure
CP to MP Transfer Procedure Network

  • 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


Next steps
Next Steps Network

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


Comments thank you
Comments ? Network Thank you !