User's Manual

9 Managing the Network
232 Installation and User Guide: Airgo Access Point
Figure 169: Layer-3 Mobility - Tunnel Approach
The tunneling approach uses mobility agents (MAs) and mobility sub-agents (MSAs). Each MA
configures a tunnel to every other MA in the network, thereby creating a fully meshed tunneled
infrastructure to carry Layer-3 Mobility traffic between these subnetworks. There can only be one
MA per subnet, and it is highly recommended that the AP you designate as MA be directly
connected to the wired network (not a wireless-backhaul AP). All other APs in the subnetwork
automatically assume the role of an MSA and forward their Layer-3 Mobility traffic to the MA in
the same subnet. The MSAs do not need to be configured; they automatically bind to the MA, and it
is the MA’s job to periodically advertise itself to all APs on the subnet (See Figure 170).
NOTE: If the MA is in the process of booting when a client station is already
associated with the MSA, then the station cannot roam successfully on its first attempt.
Subsequent roaming attempts should succeed.
WNI NMS AAA
Corporate
Network
10.1.1.5 10.1.1.5
Internet
10.1.2.x10.1.1.x
Enhanced IAPP
Update Frame
Tunnel Management
• Secure Handoff
• Fast Handoff
• Lookup
A0057