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A Path Computation Element (PCE) Application for Pre-computed Routing

A Path Computation Element (PCE) Application for Pre-computed Routing. draft-bao-pce-pre-configured-routing-00.txt. Yuanlin Bao Xihua Fu Gang Xie ZTE Corporation. Background. Traditional Pre-configured route pre-configured by NMS not used until primary route fails usually not be updated

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A Path Computation Element (PCE) Application for Pre-computed Routing

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  1. A Path Computation Element (PCE) Application for Pre-computed Routing draft-bao-pce-pre-configured-routing-00.txt Yuanlin Bao Xihua Fu Gang Xie ZTE Corporation IETF 76, Hiroshima, November 8-13, 2009

  2. Background • Traditional Pre-configured route • pre-configured by NMS • not used until primary route fails • usually not be updated • unavailablity • need to be checked before used • faster restoration can be achieved • Pre-computed route • Pce-based “pre-configured” route • “pre-configured route” is misunderstanding in 00 version, it will be substituted by “pre-computed route” in 01 version • PCC asks for 2 (or more) routes, the first one will be signaled, the other will be kept in case a failure happens on the first route • requested/cancelled by PCC • dynamically updated according to network failure or the configured policy by pce • provider can offer better service for customer IETF 76, Hiroshima, November 8-13, 2009

  3. Application compute a primary route and a pre-computed route to node G pre-computed route {A,D,F,G} is affected, find another one ... primary route{A,B,C,G} pre-computed route {A,D,F,G} {A,D,F,G} {A,D,E,F,G} new pre-computed route {A,D,E,F,G} request a service to Client2 with a pre-computed routing service level Oh, link BC is cut ... Aha! I’m not scared! I have pre-computed route {A,D,E,F,G} signal the service with the pre-computed route signal the service IETF 76, Hiroshima, November 8-13, 2009

  4. Requirements • PCC • SHOULD be able to request pre-computed routing service • SHOULD be able to cancel pre-computed routing service • PCE • SHOULD be able to store the information of pre-computed routing service • SHOULD be able to re-compute the pre-computed route according to network states change and other configured policy • SHOULD be able to send the result of re-computed pre-computed route without PCC request IETF 76, Hiroshima, November 8-13, 2009

  5. PCEP extension • New Flag Of RP Object • Pre-Computed Routing Service Flag (bit 20) • PCC use it to request pre-computed routing service • PCE use it to send pre-computed route • Extension to Notification Object • Notification-type=3: Pre-Computed Routing Service cancelled • Notification-value=1: PCC cancels one pre-computed routing service • Notification-value=2: PCC cancels all pre-computed routing services it requested IETF 76, Hiroshima, November 8-13, 2009

  6. Summary & Next Steps • The term “pre-configured route” is misunderstanding • it will be substituted by “pre-computed route” • Draft will continue to evolve: • Evaluating requirements • Evaluating PCEP extentions • Refine it according to the feedback from meeting or mailing list • Comments are always appreciated IETF 76, Hiroshima, November 8-13, 2009

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