Industrial router of selection Detailed introduction

Detailed introduction of industrial router selection

4G industrial router is a kind of data transmission function that uses public wireless network to provide users with wireless data. How to choose a good 4G industrial router is not that simple, so what performance should a good industrial router have? Let's take a look at the seven core performances of industrial routers.

One: 4G industrial router throughput

Throughput is the packet forwarding capability of the core router. Throughput is related to the number of router ports, port speed, data packet length, data packet type, routing calculation mode (distributed or centralized), and test method. It generally refers to the processor's ability to process data packets. The packet forwarding capacity of high-speed routers is at least 20Mpps or more. Throughput mainly includes two aspects:

1. Throughput of the whole machine

The complete machine refers to the packet forwarding capability of the complete machine, which is an important indicator of equipment performance. The router's job is to select the route based on the IP header or MPLS label, so the performance index refers to the number of packets forwarded per second. The throughput of the whole machine is usually less than the sum of the throughput of all ports of the core router.

2. Port throughput

Port throughput refers to the port packet forwarding capacity, which is the packet forwarding capacity of the core router on a certain port. Usually two test interfaces of the same rate are used. Generally, the test interface may be related to the location and relationship of the interface. For example, the throughput of the test between ports on the same plug-in card may be different from the throughput value between the ports on different plug-in cards.

Two: 4G industrial router routing table capabilities

4G industrial routers usually rely on established and maintained routing tables to determine packet forwarding. The routing table capacity refers to the limit of the number of routing table entries contained in the routing table. Because the core router that implements the BGP protocol on the Internet usually has hundreds of thousands of routing table entries, this project is also an important manifestation of the router's capabilities.

Generally speaking, high-speed core routers should be able to support at least 250,000 routes, and each destination address provides at least 2 paths on average. The system must support at least 25 BGP peers and at least 50 IGP neighbors.

Three: the backplane capability of 4G industrial routers

The backplane refers to the physical path between the input and output ports. Backplane capability is the internal implementation of core routers. Traditional core industrial routers use shared backplanes. However, as high-performance industrial routers, they will inevitably encounter congestion problems. Secondly, it is difficult to design high-speed shared buses. Therefore, the existing high-speed core industrial routers Routers generally adopt a switchable backplane design.

The backplane capability can be reflected in the throughput of industrial routers, and the backplane capability is usually greater than the value calculated based on the throughput and test packet length. However, the backplane capability can only be reflected in the design and generally cannot be tested.

4: Number of back-to-back frames of 4G industrial routers

The number of back-to-back frames refers to the number of data packets when the maximum number of data packets sent at the minimum frame interval does not cause packet loss. This indicator is used to test the cache capacity of core industrial routers. The core industrial router with wire-speed full-duplex forwarding capability has an infinite value.

Five: The packet loss rate of 4G industrial routers

The packet loss rate refers to the proportion of data packets that cannot be forwarded due to lack of resources in the core industrial router under a stable continuous load.

The packet loss rate is usually used to measure the performance of the core industrial router when the router is overloaded. The packet loss rate is related to the length of the data packet and the frequency of packet transmission. In some environments, you can add route jitter or a large number of routes to test and simulate.

Six: Delay of 4G industrial routers

Delay refers to the time interval between the first bit of a data packet entering the industrial router and the last bit outputting from the core router. This time interval is the processing time of the core industrial router working in store-and-forward mode.

The time delay is related to the length of the data packet and the link rate, and is usually tested within the range of industrial router port throughput. Delay has a greater impact on network performance. As a high-speed industrial router, in the worst case, the delay of IP packets of 1518 bytes and below is required to be less than 1ms.

Seven: Delay jitter of 4G industrial routers

Delay jitter refers to delay variation. Data services are not sensitive to delay jitter, so this indicator is usually not used as an important indicator to measure high-speed core industrial routers. For IP services other than data, such as voice and video services, this indicator is necessary to test.