Software-Defined Networking for ARN Sample Clauses

Software-Defined Networking for ARN. ‌ A key component of our proposed architecture is a centralized software defined network controller (SDNC). SDNC logically controls the behaviour of the entire access network. The SDNC implements basic control protocol logic and enable the storage of traffic statistics and devices information. Communication between network nodes and controller is through dedicated channel. For simplicity, we assume such communication does not contribute significantly to the network traffic. In Port VLAN Id TCP Fields IP Fields Ethernet Fields Fiber In Port In Lambda VCC Starting Time slot Signal Type Fiber out Port Out Lambda VCC Starting Time slot Signal Type Figure 41: Mapping packet flow headers to optical flow headers The SDNC maintain abstraction from the headers in the packet fields to the optical header (OP_HEADER). This way both entries in the Ethernet packet and transport network elements are viewed as flow entries. The abstraction and subsequent mapping is significant in eliminating the technological differences between circuit flows and packet flows, thereby leading to true convergence. The controller in Figure 41 queries aggregate flow statistics from gigabit switches at the ARN. The switches respond with statistical flow information including table Id, flow count, flow descriptors, out port, in port, packet count, and total byte count. Using SDN controller in a network enables dynamic reconfiguration of communication devices.