Abstract: Example implementations relate to standby controllers for access points (APs). A network controller may comprise a processing resource; and a memory resource storing machine-readable instructions to cause the processing resource to: determine, in response to a first controller in a controller cluster failing, whether a first AP managed by a first controller has been assigned to a standby controller; determine, in response to the first AP managed by the first controller not having a standby controller assigned, a radio frequency (RF) gap as a result of a different controller failing; and based on the size of the RF gap, assign the second controller as a standby controller for the first AP.

Abstract: A method is disclosed. The method may comprise identifying a plurality of network devices in a cluster of network devices. In some examples, the method may comprise identifying any virtual local area networks (VLANs) that are enabled on each of the plurality of network devices in the cluster of network devices. In some examples, the method may comprise, for each identified VLAN, determine a set of network devices accessible on a respective VLAN. In some examples, the method may comprise probing the respective VLAN in response to the respective VLAN being accessible by each network device in the cluster of network devices. A network device and a machine-readable medium are also disclosed.

Abstract: A network device is disclosed. The network device comprises a processor. The processor may be obtain information of devices that are connected to the network device and, together with the network device, form a cluster of network devices; obtain, for each network device in the cluster of network devices, a plurality of parameters indicative of the connectivity of the network devices with one another; assign, based on the plurality of parameters, a grouping structure, whereby each network device in the cluster of network devices is assigned to a group according to a common value of the parameters shared by the network device and other network devices in the group; and assign, based on the grouping structure, each network device in the cluster of network devices as either an active device or a backup device, each active device having a corresponding backup device. Each backup device may be in a group which has no overlap with the group of the corresponding active device.

Abstract: A network device is disclosed. The network device comprises a processor. The processor may be obtain information of devices that are connected to the network device and, together with the network device, form a duster of network devices; obtain, for each network device in the duster of network devices, a plurality of parameters indicative of the connectivity of the network devices with one another; assign, based on the plurality of parameters, a grouping structure, whereby each network device in the cluster of network devices is assigned to a group according to a common value of the parameters shared by the network device and other network devices in the group; and assign, based on the grouping structure, each network device in the cluster of network devices as either an active device or a backup device, each active device having a corresponding backup device. Each backup device may be in a group which has no overlap with the group of the corresponding active device.

Abstract: A method is disclosed. The method may comprise identifying a plurality of network devices in a cluster of network devices. In some examples, the method may comprise identifying any virtual local area networks (VLANs) that are enabled on each of the plurality of network devices in the cluster of network devices. In some examples, the method may comprise, for each identified VLAN, determine a set of network devices accessible on a respective VLAN. In some examples, the method may comprise probing the respective VLAN in response to the respective VLAN being accessible by each network device in the cluster of network devices. A network device and a machine-readable medium are also disclosed.

Abstract: Example implementations relate to standby controllers for access points (APs). A network controller may comprise a processing resource; and a memory resource storing machine-readable instructions to cause the processing resource to: determine, in response to a first controller in a controller cluster failing, whether a first AP managed by a first controller has been assigned to a standby controller; determine, in response to the first AP managed by the first controller not having a standby controller assigned, a radio frequency (RF) gap as a result of a different controller failing; and based on the size of the RF gap, assign the second controller as a standby controller for the first AP.

Abstract: A system is described that includes a first network controller and a second network controller. The first controller operates as a master controller and the second controller operates as a standby controller for a set of access points. Using a set of VRRP advertisements between the first and second controllers, the second controller may (1) determine that the first controller has failed independent of any determination by the access points and (2) send a failover request to the access points. The failover request may cause the access points to use previously established tunnels between the second controller and each of the access points. By transmitting a failover request message from the second controller to the access points upon the detection by the second controller that the first controller has failed and independent of any determination by the access points, the system reduces network access downtime for the access points.

Abstract: A system is described that includes a first network controller and a second network controller. The first controller operates as a master controller and the second controller operates as a standby controller for a set of access points. Using a set of VRRP advertisements between the first and second controllers, the second controller may (1) determine that the first controller has failed independent of any determination by the access points and (2) send a failover request to the access points. The failover request may cause the access points to use previously established tunnels between the second controller and each of the access points. By transmitting a failover request message from the second controller to the access points upon the detection by the second controller that the first controller has failed and independent of any determination by the access points, the system reduces network access downtime for the access points.

Abstract: A system is described that includes a first network controller and a second network controller. The first controller operates as a master controller and the second controller operates as a standby controller for a set of access points. Using a set of VRRP advertisements between the first and second controllers, the second controller may (1) determine that the first controller has failed independent of any determination by the access points and (2) send a failover request to the access points. The failover request may cause the access points to use previously established tunnels between the second controller and each of the access points. By transmitting a failover request message from the second controller to the access points upon the detection by the second controller that the first controller has failed and independent of any determination by the access points, the system reduces network access downtime for the access points.