User's Manual

hwc_controlleravailmobility.fm
Availability, mobility, and controller functionality
Mobility manager
A31003-W1050-U100-2-7619,
March 2008
HiPath Wireless Controller, Access Points and Convergence Software V5 R1 , C20/C2400 User Guide 259
When the failed HiPath Wireless Controller recovers, each HiPath Wireless
Controller in the pair goes back to normal mode. They exchange information that
includes the latest lists of registered Wireless APs. The administrator must
release the Wireless APs manually on the second HiPath Wireless Controller, so
that they may re-register with their home HiPath Wireless 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 Released.
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 HiPath Wireless Controller (in the Reports
and Displays section of the HiPath Wireless Controller).
2. After recovery, on the HiPath Wireless Controller that did not fail, select the
foreign Wireless APs, and then click Release on the Access Approval page.
7.2 Mobility manager
The HiPath Wireless Controller, Access Points and Convergence Software
system allows multiple HiPath Wireless Controllers (up to 12) on a network to
discover each other and exchange information about a client session. This
technique enables a wireless device user to roam seamlessly between different
Wireless APs on different HiPath Wireless Controllers.
The solution introduces the concept of a mobility manager, where one HiPath
Wireless Controller on the network is designated as the mobility manager and all
others are designated as mobility agents.
The wireless device keeps the IP address, VNS assignment, and filtering rules it
received from its home HiPath Wireless Controller—the HiPath Wireless
Controller that it first connected to. The VNS on each HiPath Wireless Controller
must have the same SSID and RF privacy parameter settings.
For the mobility manager you have two options:
• Rely on SLP with DHCP Option 78
• Define at the agent the IP address of the mobility manager. By explicitly
defining the IP address, the agent and the mobility manager are able to find
each other directly without using the SLP discovery mechanisms. Direct IP
definition is recommended in order to provide tighter control of the registration
steps for multi-domain installations.
The HiPath Wireless Controller designated as the mobility manager:
• The mobility manager is explicitly identified as the manager for a specific
mobility domain. Agents will connect to this manager to establish a mobility
domain.