Can you please explain what the "stateful compute-only" stands for I don't understand what is stateful in a path computation request only. IMHO either I ask the PCE (SDN controller, NMS, whatever) to compute a path and then forget about it or I ask to compute and provision it. I don't understand the value of asking for it and remembering about it.
BR Daniele From: Scharf, Michael (Nokia - DE) [mailto:[email protected]] Sent: giovedì 3 novembre 2016 14:45 To: Igor Bryskin <[email protected]>; Daniele Ceccarelli <[email protected]>; CCAMP ([email protected]) <[email protected]>; [email protected]; TEAS WG ([email protected]) <[email protected]>; [email protected] Subject: RE: http://tools.ietf.org/html/draft-busibel-teas-yang-path-computation-00 We have discussed this before. From an implementer's perspective, the two clean solutions to the problem seem to either stateful "compute-only" tunnels or a stateless RPC. Michael From: mpls [mailto:[email protected]] On Behalf Of Igor Bryskin Sent: Thursday, November 03, 2016 2:34 PM To: Daniele Ceccarelli; CCAMP ([email protected]<mailto:[email protected]>); [email protected]<mailto:[email protected]>; TEAS WG ([email protected]<mailto:[email protected]>); [email protected]<mailto:[email protected]> Subject: [ALU] [mpls]http://tools.ietf.org/html/draft-busibel-teas-yang-path-computation-00 Hi, >From the draft: 6. YANG Model for requesting Path Computation Work on extending the TE Tunnel YANG model to support the need to request path computation has recently started also in the context of the [TE-TUNNEL<https://tools.ietf.org/html/draft-busibel-teas-yang-path-computation-00#ref-TE-TUNNEL>] draft. It is possible to request path computation by configuring a "compute-only" TE tunnel and retrieving the computed path(s) in the LSP(s) Record-Route Object (RRO) list as described in [TE-TUNNEL<https://tools.ietf.org/html/draft-busibel-teas-yang-path-computation-00#ref-TE-TUNNEL>]. This is a stateful solution since the state of each created "compute-only" TE tunnel needs to be maintained and updated, when underlying network conditions change. The need also for a stateless solution, based on an RPC, has been recognized. The YANG model to support stateless RPC is for further study. IB>> Please, note, that in the TE Tunnel model we consider the COMPUTE_AND_FORGET mode. We also consider the concept of path computation action to be defined under the TE tunnel node. All this is to facilitate stateless path computations. Cheers, Igor
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