draftbaopwe3pwtransfer03 Qilei Wang Muliu Tao Lizhong Jin Xihua Fu ZTE Ruiquan Jing Xiaoli Huo China Telecom Changes compared to 01 version ERTLV is added to carry the PW path information ID: 295474
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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,
Xiaoli
Huo
China TelecomSlide2
Changes compared to 01 versionER-TLV is added to carry the PW path informationAdd clarification about transfer failure.
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Contents in this draftAdvantages compared with MBBLDP extensions and proceduresPW Transfer Capability TLVPW Ownership Transfer TLV
SP-PE TLV or
ER-TLV
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AdvantagesCompare 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.
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RequirementsRequirementsRFC6373Section 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
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LDP ExtensionsPW Transfer Capability TLVCarried in LDP Initialization Message (RFC5561)Negotiating the PW transfer capability between LDP peersSP-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
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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
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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
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CP to MP Transfer ProcedureT-PEsSend CP2MP PW transfer Notification messageDelete T-LDP session according to local policy
S-PEs
Forward Notification message
Delete T-LDP session according to the local policy
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Next stepRefine the document according to the feedback of this meeting and mailing list.
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