Alternate Tunnel Encapsulation for Data Frames in Control and Provisioning of Wireless Access Points (CAPWAP)
2018
Control and Provisioning of Wireless Access Points (CAPWAP) is a
protocol for encapsulating a station's data frames between the
Wireless Transmission Point (WTP) and Access Controller (AC).
Specifically, the station's IEEE 802.11 data frames can be either
locally bridged or tunneled to the AC. When tunneled, a CAPWAP Data
Channel is used for tunneling. In many deployments, encapsulating data
frames to an entity other than the AC (for example, to an Access
Router (AR)) is desirable. Furthermore, it may also be desirable to
use different tunnel encapsulation modes between the WTP and the
Access Router. This document defines an extension to the CAPWAP
protocol that supports this capability and refers to it as alternate
tunnel encapsulation. The alternate tunnel encapsulation allows 1) the
WTP to tunnel non-management data frames to an endpoint different from
the AC and 2) the WTP to tunnel using one of many known encapsulation
types, such as IP-IP, IP-GRE, or CAPWAP. The WTP may advertise support
for alternate tunnel encapsulation during the discovery and join
process, and the AC may select one of the supported alternate tunnel
encapsulation types while configuring the WTP.
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