What is the backplane bandwidth of a switch, and is the bigger the better?

There should be no problem with the length of the network cable. The backplane bus bandwidth of the switch, which means the maximum speed that the switch can support. The backplane bus is the line that connects the UP port to each port, which is generally made on the back integrated circuit board, so it is called the backplane bus.

That's not the cause of your internet slowdown.

The actual speed of the 4M ADSL is about 400kb s from the ** speed. I don't know how fast you're testing. The 4m speed provided by Telecom is just the maximum speed you can connect to your local telecom internet server.

This speed is not that you have such a fast speed on any of the previous **, because the middle will be affected by the city export bandwidth and the inter-provincial backbone bandwidth, if you access the **speed itself is not fast enough, you yourself are useless no matter how fast you are. So if you're testing the speed of some tachy tests, there's basically no credibility. In fact, the adsl cat itself can directly see your connection speed.

Enter the configuration interface of the cat through the IP on the manual, check the ADSL status to see your actual connection speed. If there are no issues, your ADSL uplink speed should be 1024kbps s in your status display

The downlink should be 4096kbps. Of course, the uplink doesn't have to be so much, but the downlink speed must be this number, if it's less than that, your connection doesn't reach 4m. This value in the cat is the value obtained after establishing a connection with the telecom server, and this value will not be false.

What are the backplane bandwidth, switching capacity, and packet rate?

First, the reference is different.

1. Switching capacity: the ability of the switch to exchange data.

2. Backplane bandwidth: The maximum amount of data that can be throughput between the switch interface processor or interface card and the data bus.

Second, the impact is different.

2. Backplane bandwidth: The higher the backplane bandwidth of the switch, the stronger the ability to process data, but at the same time, the design cost will also be higher.

Third, the role is different.

1. Switching capacity: The routing module is directly superimposed on the high-speed backplane bus of Layer 2 switching, and Liquid Rubber breaks through the interface rate limit of traditional routers, and the rate can reach tens of gbits.

2. Backplane bandwidth: The backplane bandwidth indicates the total data exchange capacity of the switch, which is measured in Gbps, and the backplane bandwidth of the switch ranges from a few Gbps to hundreds of Gbps.

What is the practical significance of the actual backplane bandwidth of the switch exceeding the theoretical backplane bandwidth?

Hello, in general, the actual backplane bandwidth of the switch is less than the theoretical sideline backplane bandwidth, which exceeds the theoretical backplane bandwidth, is it really rare? Since the actual backplane bandwidth exceeds the theoretical value, this indicates that the total data exchange capability of the switch is stronger than the theoretical value. The backplane bandwidth of a typical switch ranges from a few Gbps to hundreds of Gbps.

The higher the bandwidth of a switch's backplane, the higher the ability to handle data or data, but the higher the design cost. Wire-rate backplane bandwidthBackplane bandwidth examines the total bandwidth that can be provided by all ports on the switch. The formula is calculated as the number of ports corresponding to the port rate 2 (full-duplex mode) If the total bandwidth is the nominal backplane bandwidth, then the backplane bandwidth is the line rate bandwidth.

Based on this, it is possible to determine how much higher the actual backplane bandwidth is than the theoretical value.

The higher the value of the switch backplane bandwidth and packet rate, the higher the data processing capacity and the higher the switch cost.

Backplane bandwidth: Backplane bandwidth, also known as backplane capacity, is the maximum amount of data that can be handled by the switch's processing interfaces, interface cards, and data buses.

It represents the overall data exchange capability of the switch, the unit is Gbps, called switching bandwidth, and the bandwidth of the backplane that we can access usually ranges from a few Gbps to hundreds of Gbps.

Packet rate: The packet rate of the switch, also known as port throughput, is the ability of the exchange machine to carry out packets on a certain port, usually pps, called packets per second, that is, the number of packets per second.

Here is a network common sense: network data transmission through data packets, and the composition of data packets is transmitted data + frame header + frame gap. The minimum packet size of a packet is 64 bytes, where 64 bytes is pure data, plus 8-byte frame headers and 12-byte frame gaps, then the smallest packet in the network is 84 bytes.

Then, when a full-duplex gigabit interface reaches line speed, the packet rate will be = 1000Mbps ((64+8+12)*8bit).

The relationship between the two:

The bandwidth of the backplane of the switch represents the total data exchange capability of the switch, and it is also an important indicator of the packet rate. Therefore, the backplane can be understood as a computer bus, and the higher the backplane, the stronger the ability to process data, that is, the higher the packet rate.

The backplane bandwidth is at the switch interface.

The maximum amount of data that can be throughput between the processor or interface card and the data bus, and the bandwidth of the backplane can reflect the total data exchange capability of the switch.

If the port is gigabit full-duplex, it can support 1000M, 1000Mbps * 28 * 2 = 56000Mbps < 32Gbps <

This switch can't achieve full line speed**, but that's just in theory, and the actual network can't be so traffic, and every port is full.

Wire-rate backplane bandwidth.

Examine the total bandwidth that all ports on the switch can provide. The calculation formula is the number of ports * the corresponding port rate * 2 (full-duplex mode) If the total bandwidth is the nominal backplane bandwidth, then the backplane bandwidth is line speed.

It does not mean that the stored data reaches 32g.

Backplane Bandwidth:

1. The backplane bandwidth of the switch, also known as the backplane capacity, is the maximum amount of data that can be throughput between the switch interface processor or interface card and the data bus;

2. The backplane bandwidth indicates the total data exchange capacity of the switch, which is measured in Gbps, and the backplane bandwidth of the general switch ranges from a few Gbps to hundreds of Gbps;

3. The higher the bandwidth of a switch's backplane, the stronger the ability to process data, but at the same time, the design cost will be higher.

Packet rate: 1. The number of 64byte packets (minimum packets) sent per unit time is used as the calculation basis;

2. For Gigabit Ethernet, the calculation method is as follows: 1,000,000,000bps 8bit (64 8 12)byte=1,488,095pps;

3. Note: When the Ethernet frame is 64 bytes, you need to consider the fixed overhead of 8 bytes of the frame header and the frame gap of 12 bytes. Therefore, the packet rate of a wire-speed Gigabit Ethernet port at 64byte packets is .

Fast Ethernet's wire-rate port packet rate is exactly one-tenth that of Gigabit Ethernet.

Backplane bandwidth is the maximum amount of data that can be handled between the switch interface processor or interface card and the data bus.

The size of the switching capacity is determined by the bit width of the buffer and its bus frequency. That is, the switching capacity Cache bit width * Cache bus frequency.

Backplane bandwidth > Switching capacity > sum of all port rates 2, and those that meet this are qualified switches.

The switching capacity of a switch, also known as backplane bandwidth or switching bandwidth, is the maximum amount of data that can be handled between the switch's interface processor or interface card and the data bus. The switching capacity indicates the total data exchange capacity of the switch, which is measured in Gbps, and the switching capacity of a general switch ranges from a few Gbps to hundreds of Gbps. The higher the switching capacity of a switch, the more data it can handle, but at the same time, the higher the design cost.

I copied it, and by the way, I learned it myself.

The switch backplane is a design value that can be greater than or equal to the switching capacity (this is a criterion for achieving wire-speed switches). When designing, the manufacturer considers the upgrade of the module in the future, such as the module upgrade from the initial 100 Gigabit to support Gigabit and 10 Gigabit, and the port density increases. Backplane bandwidth generally refers to modular switches.

It determines the maximum bandwidth between each template and the switching engine. is the maximum amount of data that can be handled between a switch interface processor or interface card and a data bus. The backplane bandwidth indicates the total data switching capacity of the switch, which is measured in Gbps, also known as the switching bandwidth.

Switching capacity: It represents the rate of the core switching engine of our switch, which is generally expressed in bps, which is related to the bit width of the buffer and its bus frequency, for example, the cache of a switch is 96 and the bus frequency is 133, then his switching capacity is 96 * 133 = 12....In fact, some engineers of equipment manufacturers already think that the concept of backplane bandwidth is meaningless, and the switching capacity and the ** rate to be mentioned below determine the performance of the switch, and this parameter largely depends on the switch matrix.

Switching capacity (maximum bandwidth, throughput) refers to the maximum ability to exchange data between user interfaces in the system, and the exchange of user data is realized by the fabric. When the switch reaches line speed, the switching capacity is equal to the number of ports corresponding to the port rate 2 (full-duplex mode).

Packet rate: In fact, this packet rate is the packet rate of the third layer, and the exchange capacity above is the packet rate of the second layer. To calculate the Layer 3 packet rate, to put it simply, what is the port rate of Gigabit?

1000,000,000bps*8*(64+8+12)=, 8 represents 8 bits, and 64+12+8 represents a frame with a data field of 64 bytes, the actual number of bytes used for transmission on the network, the header of 8 bytes, and other overheads of 12 bytes. In the same way, the packet rate of the 100 Gigabit interface is Ha. Therefore, in order to achieve our envelope speed in the third layer, we must at least meet this condition, and our envelope rate.

Packet rate: It reflects the performance of the switching engine. Standard Ethernet frame sizes range from 64 bytes to 1518 bytes, and the smallest packet size should be used to measure the packet capability of a switch. Refers to the total amount of data in a unit of time, based on a 64-byte packet, switch**.

The switching capacity refers to the memory of the switch, and the backplane bandwidth refers to the performance of the switch, such as the bandwidth of 8 ports of 10 and 100M, the larger the bandwidth, the better the performance.