API Guide

Consider the case of dynamic learning of flows for bidirectional traffic. Flows are learnt as and when a packet arrives.
With dynamic learning in an OpenFlow network, the OpenFlow switch receives a packet that does not match the flow table
entries and sends the packet to the SDN controller to process it. The controller identifies the path the packet has to
traverse and updates the flow table with a new entry. The controller also decides the caching time of the flow table entries.
Configure OpenFlow
When you convert the switch from Normal mode to OpenFlow mode, the switch retains the management, interface, and AAA
settings.
NOTE: Ensure IP connectivity between the switch and the controller.
The following lists the minimum configuration you need to establish a connection between the OpenFlow controller and a logical
switch instance:
1. Enter the OPENFLOW configuration mode.
OS10# configure terminal
OS10 (config)# openflow
OS10 (config-openflow)#
2. Enable the OpenFlow-only mode.
OS10 (config-openflow)# mode openflow-only
Reload the switch. Enter yes to enable OpenFlow-only mode.
NOTE:
When the switch starts up in OpenFlow mode, it disables all Layer 2 (L2) and Layer 3 (L3) protocols. Many CLI
commands are not available in OpenFlow-only mode. For a list of available commands in OpenFlow-only mode, see
OpenFlow-only mode commands.
3. Configure a logical switch instance.
a. Option 1; for Out of Band (OOB) management:
i. Configure an IP address for the management port. Ensure that there is IP connectivity between the switch and the
controller.
OS10# configure terminal
OS10 (config)# interface management 1/1/1
OS10 (conf-if-ma-1/1/1)# ip address 11.1.1.1/24
OS10 (conf-if-ma-1/1/1)# no shutdown
OS10 (conf-if-ma-1/1/1)# exit
ii. Configure the logical switch instance, of-switch-1.
OS10# configure terminal
OS10 (config)# openflow
OS10 (config-openflow)# switch of-switch-1
b. Option 2; for in-band management:
i. Configure one of the front-panel ports as the management port.
OS10# configure terminal
OS10 (config)# openflow
OS10 (config-openflow)# in-band-mgmt interface ethernet 1/1/1
OS10 (config-openflow)#
ii. Configure an IPv4 address on the front-panel management port.
OS10# configure terminal
OS10 (config)# interface ethernet 1/1/1
OS10 (conf-if-eth1/1/1)# ip address 11.1.1.1/24
OS10 (conf-if-eth1/1/1)# no shutdown
OpenFlow
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