Table of Contents
Advertisement
When the Altitude APs connect to the second Summit WM Controller, they are assigned to the WM-AD
that is defined in the system's default AP configuration. The wireless device users log on again and are
authenticated on the second Summit WM Controller.
When the failed Summit WM Controller recovers, each Summit WM Controller in the pair goes back to
normal mode. They exchange information includes the latest lists of registered Altitude APs. The
administrator must release the Altitude APs manually on the second Summit WM Controller, so that
they may re-register with their home Summit WM Controller. Foreign APs can now all be released at
once by using the Foreign button on the Access Approval page to select all foreign APs, and then
clicking Release.
To support the availability feature during a failover event, administrators need to do the following:
1 Monitor the critical messages for the failover mode message, in the information log of the remaining
Summit WM Controller (in the Reports and Displays section of the Summit WM Controller).
2 After recovery, on the Summit WM Controller that did not fail, select the foreign Altitude APs, and
then click Release on the Access Approval page.
Availability prerequisites
Before you begin, ensure you have completed the following:
Choose the primary and secondary Summit WM Controllers.
Verify the network accessibility for the UDP connection between the two controllers. The availability
link is established as a UDP session on port 13911.
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 the Summit WM Controllers.
NOTE
You must ensure that the Poll Timeout value on the AP Properties page is set to 1.5 to 2 times of Detect link failure
value on Altitude AP Registration page. For more information, see
page
86.
If the Poll Timeout value is less than 1.5 to 2 times of Detect link failure value, the Altitude AP failover will not
succeed because the secondary controller will not be 'ready' to accept the failover APs.
On the other hand, if the Poll Timeout value is more than 1.5 to 2 times of Detect link failure value, the Altitude
APs failover will be unnecessarily delayed, because the Altitude APs will continue polling the primary controller even
though the secondary controller is "ready" to accept them as the failover APs.
In order to achieve ideal 'availability' behavior, you must set the Poll Timeout value on the AP Registration page to
15 seconds, and the Detect link failure on Altitude AP Registration page to nine seconds.
Now set up each Summit WM Controller separately. One method is as follows:
1 On the AP Registration page, set up each Summit WM Controller in Stand-alone Mode.
2 On the Topology tab, define a WM-AD on each Summit WM Controller with the same SSID. The IP
addresses must be unique. For more information, see
Summit WM Controller WM20/200/2000 VLAN Bridged WM-AD can permit two controllers to
share the same subnet (different IP addresses). This setup provides support for mobility users in a
VLAN Bridged WM-AD.
Summit WM User Guide, Software Version 5.3
"Modifying an Altitude AP's properties" on
"Topology of a WM-AD" on page
143. A
233
Advertisement
Table of Contents
