Working with controlled APs
Discovery of controllers by controlled APs
6-10
Discovery recommendations
Note When controller teaming is active, controlled APs discover a team in the same way that they
discover non-teaming controllers.
If the AP is on the same subnet as the controller, then UDP discovery will work with
no configuration required on either the AP or controller. This applies whether the
controller is operating as the DHCP server for the network or if a third-party DHCP
server is used.
If VLANs are being used, then UDP discovery will also work with no configuration.
However, to speed up the discovery process you can provision the AP with a specific
VLAN ID. This will eliminate the need for the AP to find and attempt discovery on all
available VLANs.
If the AP is on a different subnet than the controller, UDP discovery will not work.
Instead, DHCP or DNS discovery must be used, or direct IP address discovery must be
provisioned.
DHCP discovery: If you have control of the DHCP server, enable support for the
Colubris Vendor Class as explained in DHCP discovery on page 6-8.
DNS discovery: If you have control of the DNS server, you can configure it to resolve
the default controller names that an AP will search for. To use custom names, you
must provision discovery settings on the AP. For more information on using custom
names, see Provisioning discovery on page 6-37.
Specific IP discovery: This method needs to be used when you do not have control
over the DHCP and DNS servers and no domain is registered to the controller. For
example, if the connection to the controller is routed over the public Internet.
For discovery to succeed, the AP must be provisioned with the controller IP address.
See Provisioning discovery on page 6-37.
When working with a controller team, APs should be provisioned to discover all
controllers that make up the team, not just the team manager. This is required for proper
fail-over operation.
Controller
AP
102.27.3.42 35.12.33.57
Provisioned to discover
the controller at the
address 102.27.3.42
Internet port
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