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Stateful PCE – LSP initiation draft- crabbe - pce - pce -initiated- lsp

Stateful PCE – LSP initiation draft- crabbe - pce - pce -initiated- lsp. Ed Crabbe Ina Minei, Siva Sivabalan Robert Varga. LSP instantiation - what and why. What PCE instructs an LER to create (or remove) an LSP Version 00 is MPLS-TE specific Why

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Stateful PCE – LSP initiation draft- crabbe - pce - pce -initiated- lsp

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  1. Stateful PCE – LSP initiationdraft-crabbe-pce-pce-initiated-lsp Ed Crabbe Ina Minei, Siva Sivabalan Robert Varga

  2. LSP instantiation - what and why What • PCE instructs an LER to create (or remove) an LSP • Version 00 is MPLS-TE specific Why • For support of SDN applications where new paths need to be provisioned based on application demand • Works with arbitrary vendors (no need to be aware of config) • Lightweight mechanism

  3. LSP creation - how • New PCCreate message • Support is negotiated at session establishment • New flag in the STATEFUL-PCE-CAPABILITY TLV • Ability to specify all or just part of the parameters • MUST specify endpoints and symbolic name • MAY specify ERO, bandwidth, priorities, etc • use local values for unspecified parameters • The PCC can set a limit on the number of PCE-initiated LSPs • The PCE may update attributes after the instantiation

  4. LSP removal - how • The PCE can remove an LSP by sending a PCUpd with the R flag set • Failure handling • PCE-initiated LSPs are garbage collected after a failure • Garbage collection timer is negotiated at session init time and is distinct from the delegation timeout timer

  5. LSP ownership • PCE-initiated LSPs are automatically delegated to the PCE • Via a PCRpt message sent by PCC • The PCC may not revoke the delegation • The PCE may return the delegation (to allow for transfer of control to a different PCE) • Returning the delegation triggers the garbage collection timer

  6. Open issues • IANA section needs to be cleaned up (across all the stateful PCE drafts) • Error conditions need to be cleaned up (including errors in LSP creation, relay of errors found in LSP setup, etc) • Security considerations needs to be completed

  7. Q & A

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