Lenovo RackSwitch G8264 Application Manual page 274

Table-Miss
274
G8264 Application Guide for ENOS 8.4
In OpenFlow 1.3, if a match is not found for an arriving packet, the packet is either
dropped or sent to the controller. If sent to the controller, the controller decides
which action(s) to perform on all packets from the same flow. The decision is then
sent to the switch and cached as an entry in the switch instance's flow table. If the
controller decides to add the flow, it sends a flow add message to the switch. The
switch then adds the flow in its flow table. The next arriving packet that belongs to
the same flow is then forwarded at line‐rate through the switch without consulting
the controller.
By default, packets that don't match any of the existing flow entries are dropped.
To set up an OpenFlow instance to send non‐matching packets to the controller
instead of dropping them, use the following commands:
RS G8264(config)# openflow instance <instance ID>
RS G8264(config­openflow­instance)# table­miss controller