Network management control technology with QoS as the core

 

In traditional IP networks, each forwarding node treats all packets equally, and uses the first-in-first-out policy to send the packets to the destination, it cannot guarantee the reliability, transmission latency, and other performance of message transmission.

 

 

In the broadband network environment supported by multiple businesses, different types of businesses have different network performance requirements. customer-centric, meeting the service quality at different levels is a major feature of the network. With the increasingly fierce competition in the market, network operators of different types all need to rely on networks to improve work efficiency and reduce work costs. One-network multi-energy has become the direction of user demand, and corresponds to multiple network management and control technologies with QoS as the core.

 

In recent years, QoS technologies have developed rapidly. All telecom-level equipment vendors in the industry can provide QoS functions to varying degrees. QoS has gradually become a popular technology application on layer-3 Ethernet switches, but the reality is that the service quality is still far away from the real support for multi-service broadband applications. QoS alone cannot completely solve the problems it needs to solve.

 

Users need to continuously improve their bandwidth, and require a variety of network applications to operate on a simple platform. The network structure is simplified but the maximum controllability is required, the current network architecture needs to be able to smoothly transition to the next generation network. As the overall network scale and performance grow, the cost will continue to decrease ...... However, in the current network switching architecture centered on CPU and software, these are all conflicting.

 

The network environment requires more dedicated devices. The tiangong iSpirit68 series of high-end switches jointly launched by Lenovo and its partners provide telecom-level reliable assurance for the construction of an Ethernet environment based on technologies such as ATM, SONET, and SDH, in addition, it can provide more extensive business support than the above technologies. Thus, Lenovo networks have become the foundation for building a "trusted network environment" for users.

 

Enable Qos to facilitate reasonable use of Bandwidth Resources

 

In terms of the switching structure of the entire machine, the shared memory structure, that is, the central switching matrix plus the distributed switching matrix, implements a non-blocking switching structure, this can avoid performance degradation caused by the activation of multiple functions in the traditional routing system. In the switch structure of tiangong iSpirit68 08, all functional modules have an independent Switching Matrix, which can process and forward packets independently. The CPU is responsible for allocating swap resources, processing of some complex tasks, and for packet forwarding and QoS control that has the greatest impact on performance, there is a dedicated ASIC chip for processing. Because the CPU and ASIC share different work, and data forwarding and QoS control are also completed by different ASIC chips, this can ensure the speed of full line rate switching, implement QoS.

 

Adding priority based on hardware QoS and increasing the bandwidth granularity can make up for the performance drag of CPU and the lack of ASIC flexibility. Traditional vswitches support less hardware priority for each port, which leads to different network applications not being assigned the corresponding priority. Applications that are sensitive to transmission latency, such as voice and video, need to compete for bandwidth resources with those that are not sensitive to bandwidth latency, such as email and file transmission. The transmission quality cannot be effectively protected. Each port of tiangong iSpirit 68 series products supports eight hardware priorities, and there are also eight corresponding application methods. 8 hardware priorities are added to the ASIC to ensure policy-based service quality of the switch engine, including priority allocation, bandwidth management, and congestion control, fully guarantees the transmission quality of speech, video, and other transmission latency-sensitive applications. At the same time, it can divide the bandwidth into 1/50 of the total bandwidth, enhancing the flexibility of bandwidth control.

 

QoS is not omnipotent. QoS cannot create bandwidth and cannot solve the problem of massive bandwidth applications dominated by video data streams. However, QoS is absolutely impossible without it, after all, as bandwidth continues to keep up with the demand, QoS can make more reasonable use of our limited bandwidth resources to provide different levels of services for different application needs, this eliminates the conflict between the network control capability and the network data forwarding performance.