Cisco Cisco Aironet 1522 Lightweight Outdoor Mesh Access Point 디자인 가이드

This section describes the architecture overview of a mesh network.

CAPWAP is the provisioning and control protocol used by the controller to manage access points (mesh 
and nonmesh) in the network. In release 5.2, CAPWAP replaced LWAPP.

Upgrading from an earlier LWAPP release (4.1.x.x or earlier) to release 5.2 is transparent. CAPWAP 
supports path maximum transmission unit (MTU) discovery and it is configurable on switches and 
routers in the backbone network.

Mesh features are not supported on controller releases 5.0 and 5.1.

CAPWAP significantly reduces capital expenditures (CapEx) and operational expenses (OpEx), which 
enables the Cisco wireless mesh networking solution to be a cost-effective and secure deployment option 
in enterprise, campus, and metropolitan networks.

The process for CAPWAP discovery on a mesh network is as follows:

A mesh access point establishes a link before starting CAPWAP discovery, whereas a nonmesh 
access point starts CAPWAP discovery using a static IP for the mesh access point, if any.

The mesh access point initiates CAPWAP discovery using a static IP for the mesh access point on 
the Layer 3 network or searches the network for its assigned primary, secondary, or tertiary 
controller. A maximum of 10 attempts are made to connect.

The mesh access point searches a list of controllers configured on the access point (primed) 
during setup.

If Step 2 fails after 10 attempts, the mesh access point falls back to DHCP and attempts to connect 
in 10 tries.

If both Steps 2 and 3 fail and there is no successful CAPWAP connection to a controller, then the 
mesh access point falls back to LWAPP.

If there is no discovery after attempting Steps 2, 3, and 4, the mesh access point tries the next link.

If the MTU is changed in the network, the access point detects the new MTU value and forwards that to 
the controller to adjust to the new MTU. After both the access point and the controller are set at the new 
MTU, all data within their path are fragmented into the new MTU. The new MTU size is used until it is 
changed. The default MTU on switches and routers is 1500 bytes.