![]() A table miss is when a packet does not match an entry in a flow table. Flow tables are required to support table miss functionality. Traffic can be forwarded down particular links based on price of bandwidth, time of day, controller-to-switch latency, or any other constraint.Ī key concept of this tutorial is how to take an OpenFlow switch and instantiate a "table miss" flow policy. As new users plug into the network, their packets could be redirected to a server for authentication, which could then add a security policy based on identity. Rules can be installed for forwarding flows to multiple ports for selective traffic monitoring. ![]() For instance, firewalling policies could be implemented to drop any L2-L4 traffic to specific ports, MAC addresses or IP addresses. This provides a blank slate for network engineers to install custom flow rules to forward, rewrite or drop traffic. Using the "OpenFlow normal" rule as the default action allows for integration of OpenFlow/SDN islands to be connected into the native network. Once installed and running, I use the RESTful API to send an OpenFlow flow modification (flowmod) to instantiate a flow rule. The following tutorial demonstrates how to set up the Floodlight open source controller for controlling an OpenFlow-enabled switch.
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