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What are the differences between sFlow, NetFlow, and SNMP?
The differences between sFlow, NetFlow, and SNMP are mainly reflected in the following aspects:
First, the principle and implementation of technology sFlow is a technology used to monitor the traffic forwarding status of switches or routers on data networks.
. Adopting dedicated chips embedded in hardware, aimed at eliminating the CPU and memory burden of routers or switches. A system is composed of sFlow agents (embedded in forwarding devices such as switches or routers) and sFlow collectors. The sFlow agents transmit sFlow datagrams to the central sFlow collector for analysis. It is a pure packet sampling technique that monitors traffic based on samples, and may not be able to obtain 100% accurate upsampling values. NetFlow: It is a software based technology that is unique to Cisco Internet Operating System (IOS). Mainly used to record network traffic into the devices cache, providing accurate traffic testing. The system includes a detector (NetFlow Monitor), a collector (NetFlow collector), and a reporting system (Flow Records). Generate NetFlow cache by processing the first IP packet data in the data stream, and then transmit the same data in the same data stream based on the cache information, providing nearly 100% accuracy. SNMP (Simple Network Management Protocol): It is a standard Internet protocol used to collect and organize information about managed devices on IP networks. Simultaneously supporting the modification of this information to alter device behavior, monitoring the bandwidth utilization of router and switch ports, as well as device readings such as CPU load and memory utilization. It is usually used to collect detailed in
2. Monitoring Range and Accuracy sFlow: It can sample all content and access traffic from OSI layers 2 to 7.
. Due to the sample based sampling technique, it may not be possible to obtain 100% accurate values of traffic for each host. NetFlow: Only monitors IP traffic. It is possible to describe with near 100% accuracy who communicated through the device. SNMP: The monitoring range is relatively wide, but it is usually used to collect basic traffic information and device status information. The accuracy of traffic monitoring is not as good as sFlow and NetFlow.3. Real time performance and resource consumption sFlow: The real-time performance is good, but due to its hardware based sampling technology, it consumes less CPU and memory.
. NetFlow: Although it provides start and end times for each flow, its real-time performance is not as good as SNMP. Due to the need to record detailed traffic information, it will consume more disk space to store historical information. SNMP: enables real-time (per second) monitoring of the network. The resource consumption is relatively low, but the specific consumption depends on the level of detail of the monitored devices and information.Fourth, Application Scenarios sFlow: It is more suitable for use in multi protocol networks and can monitor traffic from OSI layer 2 to layer 7.
. NetFlow: More suitable for use in situations where accuracy and scalability need to be improved and based on IP traffic. Scenarios that require accurate traffic monitoring and analysis, such a