addresses of ZoneDirector devices on the network along with the address of the
DNS server that can help resolve the ZoneDirector IP addresses.
3.
After the AP obtains an IP address, it first attempts to contact a ZoneDirector whose
IP address has been pre-configured on the AP. If an AP has a pre-configured
ZoneDirector IP address, it will always use an L3 LWAPP (lightweight access point
protocol) discovery message to attempt to discover the pre-configured
primary/secondary ZoneDirector.
• An AP with a pre-configured ZoneDirector IP address will only attempt to discover
the pre-configured ZoneDirector(s) and will skip the DHCP/DNS/last joined
ZoneDirector steps. If it is unable to contact its pre-configured ZoneDirector, it
will enter “sulk” state, and will remain in an idle/discover/sulk loop until it receives
a response from a pre-configured primary or secondary ZoneDirector.
4.
If a primary/secondary ZoneDirector IP address has not been configured on the AP,
the AP next attempts to build a list of candidate ZoneDirectors by sending an L3
discovery request (IPv4 subnet broadcast/IPv6 multicast packet) to each candidate
address received from DHCP and DNS at the same time, and waits for a response
from any ZoneDirector that can respond.
• The AP may receive multiple responses from DHCP and DNS if multiple
ZoneDirector IP addresses have been configured on the DHCP server or DNS
server.
5.
If the AP receives a response from a single ZoneDirector device, it will attempt to
register with that ZoneDirector device.
6.
If the AP receives responses from multiple ZoneDirector devices, it will attempt to
register with the ZoneDirector that it previously registered with (if any).
• This ZoneDirector can be on the same local IP subnet or a different subnet. The
AP will have a preference for a ZoneDirector device that it previously registered
with.
7.
If this is the first time that the AP is registering with ZoneDirector, it will attempt to
register with the ZoneDirector device that has the lowest AP load. The AP computes
the load by subtracting the current number of APs registered with ZoneDirector from
the maximum number of APs that ZoneDirector is licensed to support.
If the AP does not receive a response from any ZoneDirector device on the network, it
goes into idle mode. After a short period of time, the AP will repeat this discovery cycle
until it successfully registers with a ZoneDirector.
Ruckus Wireless ZoneDirector™ Release 10.0 User Guide
26
Introducing ZoneDirector
Ensuring That APs Can Communicate with ZoneDirector
