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Implementation supports state synchronization with PCC reporting reporting LSPs’ state to PCEP protocol handler running on ONOS immediately after session established. These report messages are notified to PCEP Tunnel Provider via message listener which in turn will inform the ONOS Core about the existing tunnels in the network. The Report message can also be the result of PCE initiated messages for creating, updating or releasing tunnels. In this case PCEP Tunnel Provider will invoke the respective API to notify ONOS Core about the result of create or update or release tunnels. All communication between PCEP provider and ONOS Core uses Provider Service interface.

Pcep Tunnel Provider API

The below API are implemented for tunnel provider in PCEP SBI

SetupTunnel API

Arguments: Tunnel, Path

Return Value: None

Details: This API is responsible for setting up a tunnel on the device. It gets the tunnel parameters from the input parameters Tunnel and Path. The API implementation builds the PCInitiate protocol message from the input parameters. The ingress and egress are taken from src and dst members of Tunnel class. The ingress is considered as source for the tunnel and PCInitiate message is sent to ingress device for which a session is already established with the PCEP protocol handler. The explicit route object is built from the link parameter in the input Path class. The API implementation will take care of generating unique ID for sending the message to PCC and mapping the response from PCC. Finally the response is given to ONOS core using PCEP tunnel provider service.

UpdateTunnel API

Arguments: Tunnel, Path

Return Value: None

Details: This API is responsible for modifying an existing tunnel on the device. It gets the tunnel parameters from the input parameters Tunnel and Path. The API implementation builds the PCUpd protocol message from the input parameters. To send a PCUpd message the ingress device should have a tunnel which is already created and the PCE must be the owner of this tunnel. The ingress and egress for the tunnel are taken from src and dst of Tunnel class. The ingress is considered as source for the tunnel and PCUpd message is sent to ingress device for which a session is already established with the PCEP protocol handler. The explicit route object is built from link parameter in the Path class. The API implementation will take care of generating unique ID for sending the message to PCC and mapping the response from PCC. Finally the response is given to ONOS core using PCEP tunnel provider service.

ReleaseTunnel API

Arguments: Tunnel

Return Value: None

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