HP VAN SDN Controller Administrator Guide v3

Figure 29 Example of the Flows View for a Specific OpenFlow Device
NOTE: The "Table ID" field applies to OpenFlow 1.3 and greater, but not to OpenFlow 1.0.
2.9 OpenFlow Topology
The Topology viewer displays a topology of discovered switches and end nodes. The viewer creates
and updates a graph of the network, and computes the broadcast tree to avoid loops and broadcast
storms when hybrid mode is set to
false
. (See “Hybrid mode for controlling packet-forwarding” (page 75).) The shortest path is computed
using Dijkstra’s graph search algorithm. The viewer:
• Displays a topology of discovered switches and end nodes.
• Identifies the ports discovered on a given switch.
• Identifies the shortest path between two nodes.
• Provides node identification options (MAC or IP address label).
• Provides a view of switch port identifiers, active flow rules, and a tool for testing flow rule
options.
CAUTION: Do not allow a loop between the OpenFlow and non-OpenFlow portions of your
network unless you enable Spanning Tree Protocol on the non OpenFlow devices operating in the
network
NOTE: In a topology where two or more controlled switches connect to the same uncontrolled
switch, the controller will not learn the location of hosts connected to the uncontrolled switch.
2.9 OpenFlow Topology 37