CAPWAP uses two tunnels-one for control and one for data-as shown in Figure 22-10 and described in the list that follows: LWAPP has been replaced with the Control and Provisioning of Wireless Access Points (CAPWAP) tunneling protocol to implement these split-MAC functions. Termination of 802.11 traffic on a wired interface Packet acknowledgments and retransmissionsĪssociation and re-association of roaming clients Table 22-2 Split-MAC Functions of the AP and WLC Table 22-2 summarizes MAC functions of the LAP and WLC. Therefore, those functions can be moved to a centrally located platform away from the AP. The management functions are not integral to handling frames but are things that should be centrally administered. ![]() These functions must stay with the LAP hardware, closest to the clients. The LAP must interact with wireless clients on some low level, known as the Media Access Control (MAC) layer. The division of labor between the WLC and LAPs is known as split-MAC architecture. Much like EtherChannel, LAG provides redundancy and load balancing. These four ports are configured as a link aggregation group (LAG) so they can be bundled together. Notice in Figure 22-9 that the WLC has four ports connected to the switching infrastructure. ![]() Figure 22-9 Controller-Based AP Architecture
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