Symmetric Priority Guarantee Based on Endpoint Collaboration Technology White Paper-6W100

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Symmetric Priority Guarantee Based on Endpoint Collaboration Technology White Paper

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Copyright © 2022 New H3C Technologies Co., Ltd. All rights reserved.

No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of New H3C Technologies Co., Ltd.

Except for the trademarks of New H3C Technologies Co., Ltd., any trademarks that may be mentioned in this document are the property of their respective owners.

This document provides generic technical information, some of which might not be applicable to your products.

The information in this document is subject to change without notice.



Overview

Technical background

With the increasingly abundant content and extensive application of audio and video services, users have higher requirements on the experience. Traditional network devices do not distinguish between multimedia traffic and other service traffic during traffic transmission. Therefore, when network congestion occurs, audio and video services that are latency-sensitive might be lagging, which affects user experience seriously.

To resolve the issue, H3C introduces symmetric priority guarantee based on endpoint collaboration to improve user experience of audio and video services. When a wireless client sends audio and video packets that have high priorities to the AP, the AP will preferentially forward the corresponding application packets to the client, which ensures a fluent operation for the audio and video services.

Benefits

Symmetric priority guarantee based on endpoint collaboration provides the following benefits:

·     Improving user experience

In a scenario that has large user quantity and channel congestion, lags might occur to audio and video applications and this lowers the user experience. With this solution applied, when a client sends packets that have high priorities to the AP, the AP will preferentially forward the corresponding application packets to the clients. This optimizes the user experience.

·     Reducing application latency

Some high priority applications might become useless if their traffic cannot be processed in time. This solution can identify high priority traffic dynamically, forward packets preferentially, and reduce application latency, and thus reduces user complaints.

·     Accurate traffic identification

Upgrade of signature identification model is required for traditional methods such as DPI, DFI, and flow signature identification and the signature identification model uses a large amount of device memory. This solution can identify traffic directly and saves device memory.

In scenarios that have a bad logical interface condition, applying this solution can improve user experience obviously.

Implementation

Basic concepts

Endpoint collaboration

Client vendors improve the traffic priorities of certain applications for the AP to identify traffic for these services that are latency-sensitive.

Symmetric priority guarantee

After identifying the high priority traffic, the AP will match the reply traffic of the corresponding application and preferentially forward the traffic to the client.

Mechanism

Application identification

After receiving the high priority traffic, the AP will record the corresponding application signatures in the packets for replay packet identification and packet priority arrangement.

Application traffic priority guarantee

The solution uses the following mechanism to guarantee application traffic priority:

1.     After receiving packets from a client, the AP identifies packets that have high priorities and records the corresponding packet signatures.

2.     Before returning packets to the client, the AP adjusts application packet priorities based on the recorded signatures.

3.     The AP sends the packets to the client based on the adjustment.

For example, as shown in Figure 1, when the client sends packets A, B, C, D, and E with packet C having the highest priority, the AP returns the packets to the client with packet C having the highest priority.

Figure 1 Application traffic priority guarantee

 

Typical application scenarios

As shown in Figure 2, the AP connects to the AC through the switch. Enable the symmetric priority guarantee based on endpoint collaboration on the AP to meet the following requirements:

·     The AP preferentially processes the high priority packets from the client.

·     Improves application user experience on the client.

Figure 2 Network diagram

 

 

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