• Determines if a path exists between two datapaths
• Identifies the shortest path between two datapaths based on hop count or link edge weight
• Provides enumeration of the grouping of datapaths into clusters of strongly connected nodes
• For a given datapath, provides information about the cluster to which the datapath belongs
• Provides information about number of datapaths, number of links, and number of clusters
in the current topology
The Topology Manager provides notifications to subscribed applications about changes in its
broadcast tree and cluster. Applications that subscribe to these notifications can use the
information to respond to changes in topology.
Topology Viewer
The Topology Viewer application creates and updates a network graph for visualizing the network
the controller discovers. In the UI, this graph is displayed in on the OpenFlow Topology screen.
The Topology Viewer uses the services of the Topology Manager and the Link Manager.
20 Understanding the controller architecture
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