Prerequisites For Openflow - Cisco Nexus 5600 Series Configuration Manual

Prerequisites for OpenFlow

Prerequisites for OpenFlow
The OpenFlow agent requires the Cisco Nexus device to be configured with OpenFlow specific commands
in order to support topology discovery and the installation of flows. The Cisco Nexus device works in a hybrid
mode so that the default commands from the startup-config file are executed upon boot up. This might create
an undesirable effect and therefore must be changed.
If you change or negate these required commands, it can lead to unpredictable system behavior.
Note
VLAN Creation
The following command is used to create the necessary VLANs in an OpenFlow-controller switch. This
command creates the OpenFlow specific VLANs in the VLAN database.
vlan x[-y]
Even with the hybrid-Ships-In-Night mode of operation, we recommend that you segregate the VLANs among
the OpenFlow-controlled ports and the regular ports. You should take caution in ensuring that the VLANs
are not shared among the OpenFlow and non-OpenFlow ports in order to prevent traffic leaks.
Interface Level Configurations
To make the interfaces connected to other switches receive spanned traffic, the interface is connected to the
analyzer and configured to support OpenFlow. The interface ethernet command changes the parser to the
interface submode. Before entering the mode openflow command which enables OpenFlow support on the
interface, the following commands are required:
• switchport mode trunk
• switchport trunk allowed vlan x-y
Cisco One controllers can perform topology discovery of OpenFlow enabled ports. To allow topology discovery
on trunk ports, the native VLANs must be configured on trunk ports
switchport trunk native vlan z
When an interface is added to the OpenFlow logical switch, the following commands are applied to the
interface implicitly:
• mode openflow
• spanning-tree bpdufilter enable
• no lldp transmit
Cisco Nexus 5600 Series NX-OS System Management Configuration Guide, Release 7.x
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◦ Supported actions for the MAC-table are redirect-to-port and drop.
◦ The MAC-table supports a higher scale number than the ACL-table.
Configuring OpenFlow
OL-31641-01