Comprehensive Explanation of 24-port full-Gigabit Switch latency test

With the development of China's exchange industry, we have also promoted updates and upgrades of various exchange technologies. Here we mainly analyze the 24-port full Gigabit Switch error frame Filtering test QoS testing. Familiar with the following 24-port full-Gigabit Switch knowledge, such as broadcast forwarding and latency testing. You can easily select your preferred method to implement 24 full gigabit switches. Many methods will make you suddenly enlightened.

Broadcast forwarding and latency test

This test measures the packet loss rate of the tested device when forwarding broadcast data frames and the delay of broadcast data packets passing through 24 full gigabit switches.

Error frame Filtering Test

Alcatel, D-Link, and Asus 24-port full-gigabit switches do not filter out ultra-large frames. According to engineers, the 24-port full-gigabit switch supports Jumbo frames, the 24-port full-Gigabit Switch treats it as a normal frame, so it is not filtered out.

QoS Test

In daily 802.1p usage, there may be several different usage methods, one of which is that in a VLAN, different ports are connected to several different servers, the application priority of each server may be different. For example, the server that requires financial query service has a high priority.

The ports connected to the server should have a high priority. The other category is the connection between 24 full Gigabit Switches and switches, and the 24 full gigabit switches should distinguish the Data priorities of different VLANs. Based on the above different practical applications, we simulate the following test environment.

The first type is the four tested ports in the same VLAN. This type of test simulates different servers or PCs to connect to a local 24-port full-gigabit switch, the basic principle of the test is that three ports send data packets to one port, resulting in port congestion. view the results of 24 full Gigabit Switches processing data packets of different priorities.

In this type of test, I have two types: one is that the test instrument sends packets with VLAN tags, and the packet priority is set to 7, 4, 3. One is that the test instrument sends packets without VLAN tags. Each 24-port full-gigabit switch enables the port priority. Then, we will observe the results of the 24-port full-gigabit switch processing different priority packets.

The second type is that the tested port is divided into three different VLANs. This type of test simulates the Trunk connection between the 24-port full-gigabit switch and the switch, many packets with different VLAN tags are floating on this connection. Therefore, the congested port belongs to different VLANs at the same time.

We tested whether the Trunk link connected to a full Gigabit Switch with 24 ports can distinguish data with different priorities when packets with different VLAN tags pass through the same data link. The purpose of the test is to ensure that data packets with a higher priority are not lost, and that data packets with a lower priority are treated differently from those with a lower priority.

The test method is to send data frames from three ports to 4th ports at the same time. Each port starts from 30% of the load, and then increases by 10% each time until 100% of each port, causing congestion, view the results of processing data frames of different priorities on the 24-port full Gigabit Switch.

In the final test results, most of the 24-port full-Gigabit Switch testing targets, GigaX 2124X high-priority data packets always have packet loss, when the DGS-3024 tests the packet sent without a Tag and the three ports are not in the same VLAN, the 100% load has a high priority of 2% packet loss, and the test is normal in other cases.

Only one test image is provided for readers to view other websites ). The green color indicates the high-priority data frame loss rate. The blue and yellow indicate the low-priority data frame loss rate. The high-priority data frame loss rate is always 0 during the test, and the Total value indicates the Total frame loss rate ).