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Roles are discussed further in ClusteringCluster Coordination.
Network Discovery
As the subsystem charged with the management of a key model object, the Device subsystem is integral to network discovery, which includes link, topology, and host discovery.
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The Device Subsystem discovers network end-hosts via ARP and DHCP messages detected as PacketIns, and describes their locations in the network in terms of Device-Port pairs referred to as ConnectPoints. The HostLocationProvider implements this function by implementing a DeviceListener in a similar vein as the LLDPLinkProvider.
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