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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Principles

Principles

SAC Identifying Applications

Signature identification is the basic method of service detection technology. Different applications use different protocols and each protocol has its characteristics, which can be a specific port, a character string, or a bit sequence. The characteristics that can identify a protocol are called character codes. Signature identification determines an application by detecting character codes in packets. Because character codes of some protocols are embedded in multiple packets, characteristics field-based identification must collect multiple packets to identify the protocol type. The system analyzes service flows passing through the device, and compares the analysis result with the signature file loaded on the device. It identifies an application by detecting character codes in data packets, and implements fine-grained QoS management according to the identification result. Figure 27-37 shows the SAC working mechanism.
Figure 27-37  SAC working mechanism

The device identifies application protocol packets based on character codes of application protocols. As application software is upgraded and updated continuously, the character codes also change. As a result, the original character codes cannot correctly or accurately match application protocols. Therefore, character codes must be updated in a timely manner. If character codes are inherited in the software package, the software version must be updated, greatly affecting services. Huawei device separates the signature file from the system software. The signature file can be loaded and upgraded at any time, without affecting services.

Huawei analyzes various common applications to form a signature file. The signature file is pre-defined and loaded on the device, and can be updated only through device upgrade.

For application programs supported by SAC on the APs, visit Huawei Security Center at http://sec.huawei.com/sec/web/freesignature.do, set Product Type to WLAN and Product Series to WLAN, and select the product name and version as required. On the SA tab page, click the download icon. In the Detail dialog box that is displayed, click the SA-SDB Classified Application protocol ID 2.0.xls file in the Appendix File table to download it. You can find application programs supported by SAC on the AP in the downloaded file.

SAC Statistics

After the SAC statistics function is enabled on an interface, the device identifies traffic passing through the firewall interzone, classifies the traffic, and collects statistics on the traffic of different applications. Network administrators can optimize network deployment and allocate bandwidth properly based on the network traffic characteristics.

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Updated: 2019-01-11

Document ID: EDOC1000176006

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