Chapter 3 Troubleshooting; Guidelines For Using The Access Points; Important Notes; Convergence Delays - Cisco Aironet 1550 Installation Manual

Guidelines for Using the Access Points

Guidelines for Using the Access Points

You should keep these guidelines in mind when you use the access points:
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Important Notes

Convergence Delays

During deployment, the access points can experience convergence delays due to various causes. The
following list identifies some operating conditions that can cause convergence delays:
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Cisco Aironet 1550 Series Outdoor Mesh Access Point Hardware Installation Guide
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The access point can only communicate with controllers and cannot operate independently.
The access point does not support Wireless Domain Services (WDS) and cannot communicate with
WDS devices. However, the controller provides functionality equivalent to WDS when the access
point associates to it.
The access point only supports Layer 3 CAPWAP communications with the controllers.
In Layer 3 operation, the access point and the controller can be on the same or different subnets. The
access point communicates with the controller using standard IP packets. A Layer 3 access point on
a different subnet than the controller requires a DHCP server on the access point subnet and a route
to the controller. The route to the controller must have destination UDP ports 12222 and 12223 open
for CAPWAP communications. The route to the primary, secondary, and tertiary controllers must
allow IP packet fragments.
Before deploying your access points, ensure that the following has been done:
Your controllers are connected to switch ports that are configured as trunk ports.
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Your access points are connected to switch ports that are configured as untagged access ports.
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A DHCP server is reachable by your access points and has been configured with Option 43.
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Option 43 provides the IP addresses of the management interfaces of your controllers. Typically,
a DHCP server can be configured on a Cisco switch.
Optionally, a DNS server can be configured to enable CISCO-CAPWAP-CONTROLLER. Use
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local domain to resolve to the IP address of the management interface of your controller.
Your controllers are configured and reachable by the access points.
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Your controllers are configured with the access point MAC addresses and the MAC filter list is
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enabled.
Your switch must forward DHCP requests.
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The access point PoE-out port should be connected only to a single peripheral customer device, such
as a camera or sensor gateway. We recommend that the PoE-out port not be connected to a switch
or hub.
After the access points are associated to the controller, you should change the bridge group name
(BGN) from the default value. With the default BGN, the mesh access points (MAPs) can potentially
try to connect with other mesh networks and slow down the convergence of the network.
A root access point (RAP) attempts to connect to a controller using any of the wired ports (cable,
fiber-optic, PoE-in, or PoE-out). If the wired ports are operational, the RAP can potentially spend
several minutes on each port prior to connecting to a controller.
Chapter 3 Troubleshooting
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