User guide

HWC_ControllerAvailMobility.fm
A31003-W1010-A100-1-7619, July 2005
HiPath Wireless Controller, Access Points and Convergence Software V3.0: User Guide
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HiPath Wireless Controller Configuration: Availability and Mobility
Availability
8 HiPath Wireless Controller Configuration:
Availability and Mobility
8.1 Availability
The Controller, Access Points and Convergence Software system provides a feature that
maintains service availability in the event of a HiPath Wireless Controller outage.
The Availability feature links two HiPath Wireless Controllers as a pair, so that they share
information about their Wireless APs. If one Controller in a pair fails, then its Wireless APs are
allowed to connect instead to the second Controller. The second HiPath Wireless Controller
provides the wireless network and a pre-assigned VNS for the Wireless AP.
From the viewpoint of a Wireless AP, if its home HiPath Wireless Controller fails, the Wireless
AP reboots and begins its discovery process. The Wireless AP will be directed to the
appropriate second HiPath Wireless Controller of the pair.
The wireless device users that were on the Wireless AP must log in again and become
authenticated on the second HiPath Wireless Controller.
The Availability feature is set up in the Wireless AP Registration Mode screen.
Prepare for setting up the Availability feature
Before you begin, the following preparation should be done:
● Choose which HiPath Wireless Controller is the primary and which is the secondary.
● Determine the physical communication link for the TCP/IP connection between the two
HiPath Wireless Controllers (this is done over TCP port 13907), and ensure that the
interfaces used for this connection are routable.
● Set up DHCP to support Option 78 for SLP, so that it points to the IP addresses of the
physical interfaces on both HiPath Wireless Controllers that the Wireless APs are
connected to, or can reach after the Availability setup.
Now set up each HiPath Wireless Controller separately. One method is as follows:
>
The Availability feature relies on SLP and a DHCP server that supports Option 78,
as described earlier in the Wireless AP discovery and registration process. The
Availability feature controls how the paired HiPath Wireless Controllers register as
services with SLP, in normal operations and in the event of an outage.