Administrator Guide

OpenFlow 1683
If the address is assigned automatically and the interface with the assigned
address goes down, the switch selects another active interface if one is
available. Dell EMC Networking OpenFlow Hybrid becomes operationally
disabled and re-enabled when a new IP address is selected. If the address is
assigned statically, the OpenFlow feature comes up only when a switch
interface with the matching IP address becomes active.
Automatic IP address selection is done in the following order of preference.
1 Loopback interfaces.
2 Routing interfaces.
3 Out-of-band interface.
Dell EMC Networking switches support IPv4 addresses for connecting to the
OpenFlow controller. IPv6 addresses are not supported.
If IP routing is enabled, the out-of-band interface cannot be used as the
OpenFlow interface.
Once the OpenFlow IP address is selected, it is used until the interface goes
down or the OpenFlow feature is disabled or, in case of automatic address
selection, a more preferred interface becomes available.
If the out-of-band interface is manually selected as the OpenFlow IP address,
the Open Flow feature becomes enabled immediately, even if there is no IP
address assigned to the interface.
The selected IP address is used as the endpoint of the IP connections to the
OpenFlow controllers.
When the OpenFlow feature is operationally disabled, the switch drops
connections with the OpenFlow Controllers. The switch also purges all flows
programmed by the controllers.
If the administrator changes the OpenFlow variant while the OpenFlow
feature is enabled, the switch automatically disables and re-enables
OpenFlow. This causes all flows to be deleted and connections to the
controllers to be dropped.
If the administrator changes the default hardware table for OpenFlow 1.0 and
the switch is currently operating in OpenFlow 1.0 variant, the OpenFlow
feature is automatically disabled and re-enabled.