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Detailed description the difference between centralized forwarding and local forwarding modes
Updated Date:2015-03-19
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centralized forwarding

1.     Operating principle of integrated forwarding technology

Process mode of centralized forwarding is as follows.

1)User’s management frame such as 802.11 management, control message and 802.1x protocol message etc. is directly transmitted to AC for centralized processing through authentication module to realize the authentication and authority etc. of user. 
2)User’s data frame including 802.11 data and 802.3 data message from wired network is treated in local AP tunnel server. And they are forwarded to AC by AP. And AC undertakes tunnel decapsulation to send to top network in accordance with user VLAN and other authorized information to realize the centralized processing of data.


2.     Advantages of integrated forwarding


Sundary integrated forwarding technology and the data of wireless terminal adopts tunnel protocol encapsulation to increase the security of customer service.  The integrated forwarding technology has reduced the complexity to access (AP) the lateral configuration to facilitate the large-scale centralized deployment of AP. Meanwhile, user’s data flow is sent uniformly from AC side to the switched network to penetrate limpidly the network structure between AP and AC and facilitate the centralized management of user strategy and flow statistics.    

3.     Characteristic of integrated forwarding

For the networking of integrated forwarding, a tunnel data transmission business is established separately between AP and AC. All data are sent out through AC. Consequently, the load of AC is quite large.  

All data package of integrated forwarding should go through the tunnel. Consequently, the requirement for bandwidth of link is higher as well as interface of AC. The data package of integrated forwarding should be encapsulated in the tunnel to transmit, so CPU consumption for AC is more than one of local forwarding.  


The requirement for bandwidth is higher, so AP quantity of integrated forwarding managed by AC also will be subject to limit. In this way, for the network with large scale or the project required for backup, the cost will increase.  
Besides, when tunnel forwarding suffers from blocking or package loss, the difficulty for checking network fault is higher than the local forwarding.


The advantage of integrated forwarding is little modification for present network.


Local forwarding

1.     Operating principle of local forwarding technology

 When AC adopts the deployment of integrated forwarding, all flows of user (including online flow) are required to process through AC, which requires a higher performance of AC. Meanwhile, it will generate pressure for the network bandwidth between AC and AP. Especially, at the background that 802.11ac technology is becoming mature and the processing capacity of wireless access point becomes more and more strong, the single integrated forwarding method often can not meet the high-speed processing requirement of wireless data.
In order to meet the development tendency of high broadbandization of wireless network, Sundary AC+ thin AP frame supports not only the local forwarding technology but also the integrated forwarding one. Based on AC+ thin AP frame, the local forwarding of wireless data at AP is realized, which has broken through the performance bottleneck of traditional integrated forwarding.



2.     Characteristics of local forwarding

Adopt the local forwarding method with thin AP to undertake the large-scale networking, which can substitute the integrated forwarding method adopted in present completely. In the local forwarding mode, the function such as webmaster, security, authentication, roaming, QOS, load balancing, flow control and layer-2 isolation etc. is still controlled by AC uniformly. Then AP is adopted to implement concretely. Only the business data is not transmitted to AC through the tunnel to unpack by AC and forward uniformly but forward locally by AP.   

The advantage of this networking mode mainly embodies that the forwarding task of business data is distributed to AP to reduce the pressure of AC and easily meet bandwidth challenge. And AP bottleneck problem can be solved completely. Moreover, the overall throughput rate of network is increased to face 11ac era successfully.  

Comparison between local forwarding and integrated forwarding

  Local forwarding Integrated forwarding
AC Position Generally, it is link next to core switch. Generally, it is taken as layer-2 data forwarding.
AC performance pressure Low High
AP performance pressure Low Little high
Business isolation, focus distinguishing  It is required to uniformly consider wireless user and wire user and plan the forwarding path from the access layer. Generally, it is isolated with the management path of AC to AP.   The forwarding path of wireless user from AP to AC is consistent with the one of AC to AP.
Wireless encryption and decryption AP is completed. Take full advantage of encryption and decryption engine of AP to improve the overall throughput rate of networking. AP or AC is completed. AP with weaker function can be supported. For another, the requirement for AC encryption and decryption capacity is improved. And the performance pressure is higher.