Network Transmission Detection System

Abstract

The present invention is a network transmission detection system. A network device to be tested is provided with a first port to be tested and a second port to be tested. A test device can enable these ports to be tested to transmit packets to each other. The first port to be tested has a The first VLAN ID, a second VLAN ID and a first port-based VLAN ID, the second port to be tested has the first VLAN ID, the second VLAN ID and a second port-based VLAN ID, and the second port-based VLAN ID A port-based VLAN ID is the same as the first VLAN ID, a second port-based VLAN ID is the same as the second VLAN ID, and an L2 table is also stored in the network device to be tested, and the L2 table will record a first entry With a second entry, the first entry includes a first address corresponding to the first VLAN ID of the first port to be tested, and the second entry includes a second address corresponding to the first VLAN ID of the second port to be tested Two VLAN IDs, when these ports to be tested send packets respectively, the network device to be tested will return each packet to the corresponding port to be tested according to the corresponding entry in the L2 table.

Description

technical field [0001] The invention relates to a network transmission detection system, in particular to a network transmission detection system which is provided with an L2 table so that small packets can be used as test packets, and can also achieve full line load. Background technique [0002] Generally speaking, before the network communication devices (such as routers, network switches, network servers, etc.) are introduced into the market, those skilled in the art must first perform functional tests on these network communication devices to ensure that these network communication devices It has good transmission performance. However, those skilled in the art have found that when the lines are not fully loaded, even if they pass the test originally, when the user performs a self-test on each network communication device, they may find that the network communication device is not fully loaded. In view of the problem of meeting the test standard, the inventor believes th...

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Problems solved by technology

[0004] (1) Loopback Test (Loopback Test): It enables a network communication device to send a packet of a specific format to itself to verify the contents of the packet. However, due to the central processing unit (CPU) of the network communication device, on the one hand A packet needs to be generated, and on the other hand, the packet must be verified, so the transmission rate of the packet will be slower;

[0005] (2) Saturation Test: It is to put all the communication ports (ports) of the network communication device in the same virtual area network (Virtual Local Area Network, referred to as VLAN), after that, the network communication device will broadcast (Broadcast), send packets of different sizes to its own communication port, and then check these packets for the first time until the network communication device reaches the full load of the line, and after waiting for a predetermined detection period, check again within the predetermined detection period In this way, the network communication device is more able to detect errors and problems that will occur under high-speed transmission. However, due to the flow of packets of various sizes in the network system, it is more difficult to accurately detect Correct network transmission rate;

[0006] (3) Snake Test (Snake Test): It is to connect all the communication ports of the network communication device in series, so that the packet can be transmitted from the first communication port to the last communication port. However, due to the central processing of the network communication device The unit (CPU) also needs to generate packets on the one hand, and verify the packets on the other hand. Therefore, it is often impossible to generate enough packets to achieve full load of the line;

[0007] (4) External Test (External Test): It is to send and receive packets through an external test machine under the same network environment as the aforementioned snake test. To verify the function of the virtual area network, however, due to the high cost of the external test machine, and the subsequent regular repair and maintenance costs, it is not in line with the actual benefits

However, after subsequent actual use, the applicant found that due to the Memory Management Unit (MMU) inside the new SoC (System on a Chip), when transmitting packets, the limited resource allocation method will cause unknown packets (Unknown Unicast), multicast (Multicast) and broadcast (Broadcast) have usage restrictions. In this case, when the packet is less than a certain length, that is, when the network communication device forwards with a small packet, the application After people use the aforementioned network speed test method, the network transmission speed of the network communication device will not meet the standard, so that the network communication device cannot use small packets to achieve full-load transmission for network speed testing

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