very expensive at the time, but they still do not make significant progress compared to the original design. The components used are similar to a standard PC and use multiple interface cards to run specialized software.
In contrast, a multi-layer Switch Router integrates all these functions on a dedicated application integrated circuit or ASIC. ASIC is cheaper than the CPU of traditional routers and is usu
processing methods and data stream allocation methods cannot meet the throughput needs of large data streams. Here, the fast ASIC technology that can process Layer 2, Layer 3, and Layer 4 network data can meet the needs of high bandwidth and high throughput.
However, in a large-capacity, high-bandwidth environment, if the application is not constrained, the data stream in the network will be like a wild horse, a flood of dash, and cannot be collected
the enterprise.
Compared with Layer 3, the level 2 Adoption determines the so-called network control classification. A pure Layer 2 solution is the cheapest solution, however, it provides the least control over subnet division and broadcast restrictions. Layer-3 switches provide dynamic integration support for all levels in the classification. Traditional general-purpose routers and external switches can also achieve this goal. However, compared with this solution, layer-3 switches require less
packet, this requires the content recognition device to peat the inside of each data packet in each session. If a software-based architecture is adopted, serious latency and performance deterioration will occur, and congestion will inevitably occur.
Therefore, all the application layer exchange technologies implemented by hardware have gained technical advantages. The application layer switch enables all the functions of the High-level network to maximize the use of network resources. the appli
streams. Here, the fast ASIC technology that can process Layer 2, Layer 3, and Layer 4 network data can meet the needs of high bandwidth and high throughput. However, in a large-capacity, high-bandwidth environment, if the application is not constrained, the data stream in the network will be like a wild horse, a flood of dash, and cannot be collected. Therefore, how to manage and allocate data streams is a new topic in the broadband mode.
In the pro
Layer 2 solution is the cheapest solution, however, it provides the least control over subnet division and broadcast restrictions. Layer-3 switches provide dynamic integration support for all levels in the classification. Traditional general-purpose routers and external switches can also achieve this goal. However, compared with this solution, layer-3 switches require less configuration, less space, and less wiring, cheaper and more reliable performance.A layer-3 Switch has all the functions of
provides a basic new method to reduce the management burden, improve the distributed computing response, and control the network infrastructure required for Internet-centric applications.
Discrete management, control, and data plane
Integrates the gigabit network switch structure of the network service. All data pre-transmission tasks are completed at line speed using the high-speed customized ASIC module. Data Pre-transfer tasks are divided into con
-3 switch as the standard. The specific technical implementation of the switch includes:
◆ Programmable ASIC
ASIC is a dedicated Integrated Circuit dedicated to optimizing Layer 2 processing. It is the core of today's networking solutions and integrates multiple functions on one chip, it has the advantages of simple design, high reliability, low power consumption, higher performance and lower cost.
◆ Distri
that contain such 'boundary clock. Even if they are, they are generally very expensive and generally customized for a specific network. With the rapid popularization of IEEE1588-based networks, manufacturers are facing huge challenges in how to efficiently and cost-effectively implement the IEEE1588 function in product and network infrastructure.
Developing custom ASIC solutions is possible. However, as the development cost of
hardware ASIC. The most immediate scenario for deploying SDN on hardware is to use only the Tcam tables on the ASIC, as this table supports wildcard match and supports various actions such as drop,forward,broadcast,copy to CPU. There is a direct correspondence between Tcam table and OpenFlow Protocol's forwarding mode. There was an early switch to support OpenFlow on the market: they supported the OpenFlow
data exchange technology that can process the data forwarding at the network application layer is the 7th layer exchange technology. The main purpose is to improve the level of network services and turn the Internet to intelligence.
Layer-3 switching technology enables all the functions of high-level networks through application layer switches, enabling network managers to allocate network resources at a lower cost. In terms of hardware, layer-7 switches focus all functions on a dedicated appli
of network resources. the application layer switch is placed on the core layer or aggregation layer instead of close to the lower layer intervention layer, this allows network managers to allocate network resources at a lower cost.
In terms of structure, application layer switches focus all functions on a dedicated special application integrated circuit or ASIC. ASIC is cheaper than the CPU of traditional
to everyone), so it is partitioned. We can understand a vswitch as a multi-port bridge. The host or CIDR block dedicated bandwidth connected to each of its ports is independent of each other, improving network efficiency. Vswitches work on the second layer of the network. The algorithm is relatively simple, and some chip manufacturers will soon solidify it to produce the core ASIC chip of the vswitch and release the hardware line speed switch.
To sum
well as the central processing Unit-CPU. To facilitate understanding of their differences in the application, we might as well make the analogy: The DSP is like a formula car engine, the pursuit of high-speed and efficient, MCU is like a motorcycle engine, the pursuit of smart and convenient, the CPU is like a luxury home car engine, the pursuit is all-encompassing. Of course, the integration of DSP and MCU will be the corresponding FAI, can meet more and wider application needs.Features of MCU
. Therefore, any device that complies with this definition can be called an exchange device. It can be seen that "Exchange" is a widely used term. When it is used to describe the second layer of the data network, it actually refers to a bridge device; when it is used to describe the third-layer device of the data network, it also refers to a routing device. We often mention that an Ethernet switch is actually a multi-port L2 network device based on the bridge technology, it provides low-latency
Layer-3 switch structure: ASIC chip and CPUThe ASIC chip is used for layer-2 and layer-3 forwarding. It contains a MAC address table for layer-2 forwarding and a layer-3 forwarding table for IP forwarding.The CPU is used for forwarding control. It mainly maintains some software table items (including route tables and ARP tables) and configures the hardware layer-3 forwarding table of
Three-layer switch has a lot to learn, here we mainly introduce the three-layer switch intelligent flow processing technology. The popularization of computer networks and the expansion of application scope are changing our world, but also changing our thinking and life style. With the development of network technology, we are more concerned about how to use the computer and how to make use of the network to create a greater living space for human beings after entering the digital and information
subsequent processing process is similar to the forwarding of IP multicast packets between multicast routers. Each RBridge selects TRILL replication and forwarding policies only based on the distribution tree identified by the root RBridge.
It should be noted that because the TRILL technology defines a new frame format, Traditional Ethernet switches cannot support this feature through upgrading software, only Ethernet switches using the new ASIC/NP c
overall performance of the router very low.
The second-generation router divides the original data forwarding and route computing into two processors. The master processor completes route computing and completes data forwarding from the processor. Besides the system memory, the Cache structure is arranged on each network interface card, and a few common routing information is retained on the business interface card, in this way, most packets can be directly forwarded through the Service Board C
less configuration, less wiring, and cheaper prices, and provides higher network performance. Evolution of layer-3 Exchange TechnologyWith the continuous upgrade of hardware and software, the development of layer-3 switching technology has also undergone a "three generations" change. The first generation switch is a mixture of discrete electronic components and primitive software frameworks. The software function runs on a processing machine with fixed memory. With the improvement of managemen
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