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OpenDaylight SDN controller:

• OpenDaylight controller is an open-source which is developed in partnership with the Linux Foundation.

Service Abstraction Layer (SAL):

• SAL is called the controller’s nerve center.

• SAL helps the internal applications in communicating with each other.

• It helps in invoking the controller components and applications each other’s services and also to subscribe the events which they generate.

• It helps for the specific underlying protocols in providing the uniform abstract interface in the communication layer.

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