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Modify

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Modify

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  1. Modify • Modify can have a lot of meanings • Goal of this discussion • Constrain the meaning for NSI v1 • Agree on the “NSI v1” scope of modify • Rationale • NSI users “predict” their service requirements and make advanced reservations • Predictions may or may not be exact, may change over time • Modify increases the “usability” of the service • In the end, concept is “pay per use” • “No” is an acceptable response from the network • Cancel and re-request is always an option

  2. Modify primitive proposal v1 • Modify constraints • Applies to the current path/set of resources only • If a new path computation is required, then modify rejected. • New resources may be provisioned along the same path or resources may be released • Three Service Definition parameters proposed to be in-scope for modify v1 • Bandwidth (increase or decrease) • Start time • Duration or End-time (increase/decrease) • If network cannot modify the state of existing reserved or provisioned resources, it rejects the modify • Current state of reservation not modified • If modify is accepted, Service Definition parameters is updated • The resource schedule is updated.

  3. Modify primitive operation NSA-Provider (s) NSA-Requestor Modify request Adheres to common Tree/chain model of processing Modify response Confirm when all Responses received Modify confirm Modify reject