ldp extensions for pseudo wire transfer in mpls tp network draft bao pwe3 pw transfer 03
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LDP Extensions for Pseudo Wire Transfer in MPLS-TP Network draft-bao-pwe3-pw-transfer-03. Qilei Wang, Muliu Tao, Lizhong Jin, Xihua Fu ZTE Ruiquan Jing, Xiaoli Huo China Telecom. Changes compared to 01 version. ER-TLV is added to carry the PW path information

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ldp extensions for pseudo wire transfer in mpls tp network draft bao pwe3 pw transfer 03

LDP Extensions for Pseudo Wire Transfer in MPLS-TP Networkdraft-bao-pwe3-pw-transfer-03

Qilei Wang, Muliu Tao, Lizhong Jin, Xihua Fu ZTE

Ruiquan Jing, XiaoliHuo China Telecom

changes compared to 01 version
Changes compared to 01 version
  • ER-TLV is added to carry the PW path information
  • Add clarification about transfer failure.

2

contents in this draft
Contents in this draft
  • Advantages compared with MBB
  • LDP extensions and procedures
    • PW Transfer Capability TLV
    • PW Ownership Transfer TLV
    • SP-PE TLV or ER-TLV

3

advantages
Advantages
  • Compare with MBB, PW transfer in this document have following advantages:
    • FEC label binding would not be modified.
    • PW LSP binding would not be modified.
    • Extra data plane resource is not needed.
    • Available and efficient batch operation.

4

requirements
Requirements
  • Requirements
    • RFC6373
      • Section 5.3.3 describes the dynamic transfer of PW Control/Ownership to satisfy the requirement 47.
    • Requirements in RFC5493 also apply (e.g., No disruption of user traffic during the process of transfer).
  • Consistency in the process of transfer
    • PW attributes MUST not be changed
    • PW transfer MUST be independent of LSP
    • Support partial MS-PW segments transfer

5

ldp extensions
LDP Extensions
  • PW Transfer Capability TLV
    • Carried in LDP Initialization Message (RFC5561)
    • Negotiating the PW transfer capability between LDP peers
  • SP-PE TLV (RFC6073) and ER-TLV (mspw-er)
    • Both are used to carry data plane PW path information
    • PW Ownership Transfer TLV
      • Carried in Label mapping and notification message

6

mp to cp transfer procedure ss pw
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

7

mp to cp transfer procedure ms pw
MP to CP transfer Procedure (MS-PW)
  • T-PEs
    • Perform all the procedures in MP2CP SS-PW transfer plus
      • Encoding PW path into SP-PE TLV or ER-TLV
    • S-PE
      • Create PW LDP signaling state in CP
      • Decode the SP-PE TLV or ER-TLV to find the next hop
      • Forward Label Mapping message to the next hop

8

cp to mp transfer procedure
CP to MP Transfer Procedure
  • T-PEs
    • Send CP2MP PW transfer Notification message
    • Delete T-LDP session according to local policy
    • S-PEs
      • Forward Notification message
      • Delete T-LDP session according to the local policy

9

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

10

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