Configuring Multiple SDN Controllers

ExtremeXOS allows you to configure up to two SDN controllers (designated the primary and secondary controllers). Both SDN controllers are active and control flows via a process negotiated between the controllers. Out-of-band control enables the SDN controllers to connect to switches using a non-OpenFlow VLAN.

Configuring two SDN controllers provides controller redundancy. If one SDN controller goes down or connectivity is lost, OpenFlow repeatedly attempts reconnection. If connectivity cannot be re-established, then the remaining SDN controller takes over all flow control.