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: [email protected] Lizhong Jin: [email protected] Ruiquan Jing: [email protected] Xiaoli Huo: [email protected] 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: [email protected]

Lizhong Jin: [email protected]

Ruiquan Jing: [email protected]

Xiaoli Huo: [email protected]

slide2

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)
requirements
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
ldp extension
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
ldp extension cont
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
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
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 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
  • 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
  • Refine the document according to the feedback of this meeting and mailing list.
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