Cisco Cisco Aironet 1522 Lightweight Outdoor Mesh Access Point 디자인 가이드

For the backhaul, there is only one type of encapsulation, encapsulating MESH traffic. However, two 
types of traffic are encapsulated: bridging traffic and CAPWAP control and data traffic. Both types of 
traffic are encapsulated in a proprietary mesh header. 

In the case of bridging traffic, the entire packet Ethernet frame is encapsulated in the mesh header (see 

All backhaul frames are treated identically, regardless of whether they are MAP to MAP, RAP to MAP, 
or MAP to RAP. 

The mesh access point uses a high speed CPU to process ingress frames, Ethernet, and wireless on a 
first-come first-serve basis. These are queued for transmission to the appropriate output device, either 
Ethernet or wireless. Egress frames can be destined for either the 802.11 client network, the 802.11 
backhaul network, or Ethernet. 

AP1520s support four FIFOs for wireless client transmissions. These FIFOs correspond to the 802.11e 
platinum, gold, silver, and bronze queues, and obey the 802.11e transmission rules for those queues. The 
FIFOs have a user configurable queue depth. 

802.1/802.1P

Controller

802.1/802.1P

IP/IP DSCP

CAPWAP

Encapsulation

IP/IP DSCP

CAPWAP

Encapsulation

CAPWAP Control Information

Client Packet

205686

RAP

Bridging Packet

Mesh

Header

802.1/802.1P IP/IP DSCP

CAPWAP

Encapsulation

Mesh

Header

CAPWAP Control/Data

205687

MAP

RAP