Siemens Communications Inc. AP36V1A User Manual

hwc_controlleravailmobility.fm

A31003-W1050-U100-2-7619, 

March 2008

HiPath Wireless Controller, Access Points and Convergence Software V5 R1 , C20/C2400 User Guide

   

  

  

Before you begin, ensure you have completed the following:

Choose the primary and secondary HiPath Wireless Controllers.

Verify the network accessibility for the TCP/IP connection between the two 
controllers. The availability link is established as a TCP session on port 
13907.

Set up a DHCP server for AP subnets to support Option 78 for SLP, so that it 
points to the IP addresses of the physical interfaces on both HiPath Wireless 
Controllers.

Note: You should also confirm that the Poll Timeout parameter on the AP
Properties page is set to its default value i.e., 15 (seconds). For more 
information, see 

Section 4.5.2, “Modifying a Wireless AP’s properties”, on page 

90

.

If the Poll Timeout value is less than 15 (seconds), the Wireless AP failover will 
not succeed because the secondary controller will not be ‘ready’ to accept the 
failover APs. The secondary controller takes around 12 to 14 seconds after the 
primary controller goes down to be ‘ready’ to accept the failover Wireless APs. 
If the Poll Timeout value is more than 15 (seconds), the Wireless APs failover 
will be unnecessarily delayed, because the Wireless APs will continue polling the 
primary controller even though the secondary controller is ‘ready’ to accept them 
as the failover APs.

Now set up each HiPath Wireless Controller separately. One method is as 
follows:

1. On the AP Registration page, set up each HiPath Wireless Controller in 

Stand-alone Mode.

2. On the Topology tab, define a VNS on each HiPath Wireless Controller with 

the same SSID. The IP addresses must be unique. For more information, 

Section 6.3, “Topology for a VNS”, on page 164

. A HiPath Wireless Controller 

C20/C2400 VLAN Bridged VNS can permit two controllers to share the same 
subnet (different IP addresses). This setup provides support for mobility users 
in a VLAN Bridged VNS.

3. On both HiPath Wireless Controllers, set the Registration Mode to Allow only 

approved so that no more Wireless APs can register unless they are 
approved by the administrator.

4. On the AP Registration page, enable the two HiPath Wireless Controllers as 

an availability pair.