Realize highly reliable PTN ring network protection

With the progress of All-IP, the PTN network has gradually become the preferred carrier carried by the RAN network due to its MSTP-like characteristics.

The rapid increase in business volume and the gradual improvement of user experience standards for business fluency have placed higher demands on the reliability of PTN networks.

PTN protection technology is undoubtedly the main direction of the industry's research on PTN high reliability in recent years. In the Dongguan Mobile PTN Ring Network Test Bureau, which ended recently, Huawei adopted the latest high-reliability and easy-to-deploy PTN full-ring protection technology. The technology has the characteristics of zero-coupling of services, SDH-like, and enhanced fault location. It breaks through the failure risk of the original multi-point protection of the linear APS technology. migrate. This shows that the switch from APS to PTN ring protection technology (hereinafter referred to as ring protection) is bound to become a trend.

Thinking from point to face

While rejoicing in the new technology, we also calmly saw that due to different business conditions, PTN network scale, architecture, site conditions, node traffic and configuration and other information vary greatly; at the same time, in the ever-changing migration scenario, the number of The smooth transition of tens of thousands of services to a PTN network protected by a ring network is a highly sophisticated process and an operational management strategy. Due to the need to deploy the entire network, ring network protection involves multiple aspects such as the entire network architecture, resources, capacity, service adjustment, and cutover protection.

Environmental complexity affects the first step of PTN ring network success

From the perspective of network architecture, PTN ring network protection is based on physical ring formation. Ideally, some areas can achieve core looping, convergence looping, and access looping, while some areas can only partially loop, and some sites simply do not meet the conditions for looping. Environmental conditions directly achieve high-reliability PTN ring network protection. Guo Kai and Sun Tao then decided the feasibility of the ring-forming scheme and the level of the ring-forming rate. Similarly, network scale, equipment type and configuration, site type and conditions, network user conditions, and network performance also limit the success of PTN ring protection schemes.

From a business perspective, the business path is tightly coupled with the traffic on the existing network. For example, in the initial design of the ring network, attention must be paid to the fact that when switching occurs, the traffic entering the ring network doubles due to the change and overlap of the service path. At this time, can the link carrying capacity of the ring network meet the switching requirements?

Smooth business migration depends on perfect process guidance

Service migration scenarios are also different due to the current network situation. From the current situation of uneven distribution of APS, there are two cases of service migration: APS protection switching and bare service switching. The greater difficulty lies in the uncertainty of the migration process. Taking APS protection switching as an example, in the ideal case, the migration is divided into two steps: binding the service path to the ring network, and switching the service from the APS working path to the backup path; and then switching the service from the APS backup path to the entire network Protection path.

The seemingly simple two-step process requires confirmation of multiple questions: Are the APS working path and protection path available? Is there a sequence of cutover business? After each switchover, is the path after binding to the service available?

Are you sure that all business has been migrated to the new network? Is there any business interruption during the migration? Is the environment changing? ... especially for the existing network, there are thousands of PTN equipment. Such repeated and complex actions will consume a lot of manpower and material resources. How to achieve rapid and accurate business deployment is even more difficult in reality.

Precision Service Escort

As can be seen from the above, the complexity of the network and changes to all levels of the existing network during the deployment process may lead to business interruption, and the resulting losses will also be immeasurable. Therefore, there is a need for a set of end-to-end assessment, design, implementation, verification and other processes to ensure that the ring network is properly planned before deployment, smoothly migrated during deployment, and operated long-term after deployment, while ensuring business cutover protection during delivery , Safe and efficient transition to ring network protection.

Sophisticated planning, meticulous design, and careful actions stem from meticulous design. Before designing, we must understand and analyze relevant information. For the PTN ring network, we must first understand the network situation from all dimensions, determine whether the network meets the conditions for deploying the ring network, discover and circumvent the problems of the existing network, and thus design a ring network optimization solution that meets the characteristics of the existing network, so as to The impact on the existing network during the implementation is reduced to a minimum.

Evaluation process: The evaluation process of the live network can be evaluated according to the dimensions of the physical device-network architecture-business layer, including four parts: architecture evaluation, equipment resource evaluation, business evaluation and protection strategy evaluation, which can quickly locate the existing network problems and identify Renovate key points to provide data preparation and support for subsequent design schemes.

Architecture evaluation—Identify imperfect networking information and key points of transformation, and organize the network topology of the entire network topology and ring network requirements; equipment resource evaluation—collect and sort the supporting versions that do not meet the ring network deployment requirements, and the ring network can be used Resources (slots, processing boards, AIE boards) and bandwidth occupancy rate; business assessment—understand the actual path of the business and comprehensively assess business security; protection strategy assessment—find business that needs to be rectified and need adjustment Protection strategy.

Scheme design: Detailed evaluation makes fine design possible. After years of delivery and accumulation, combined with the actual deployment experience in ring network protection offices in Dongguan and Qingdao, Huawei has subdivided the design into network plan design, service adjustment plan design, ring network protection plan design, and upgrade cutover plan design. Four parts.

Networking scheme design-tailoring reasonable network transformation schemes for different networking problems. Take the tangent ring as an example, because there are hidden safety hazards of the intersection of the working path and the protection path, it is necessary to focus on the transformation of the two nodes into an intersecting ring in the design.

Ring network protection scheme design-According to the networking, business and protection strategies and loop formation requirements, specific plans for ring network deployment are given.

Business adjustment plan design-the optimization plan based on resource assessment and business and protection strategy assessment. Including the integrated design of resource allocation, the adjustment of business on the ring, and the optimization and adjustment of bandwidth resources.

Upgrade cutover plan design-formulate a reasonable upgrade strategy and business cutover plan. Due to the needs of the existing APS protection business cutover, the careful design of the cutover process should be given priority in the design of the scheme.

The rapid deployment of E2E, the smooth migration of services, and the biggest problem in implementing ring network protection are the huge network scale and relatively low labor efficiency. To this end, Huawei has developed the TCAT (TrailCutTIng AutomaTIc Tool) tool, which implements batch deployment and cutover through the U2000 network management, improving the efficiency of large network cutover that is impossible to manually achieve to the minute level. The deployment process is generally selected to be carried out in a time period with less traffic, and the business impact time can be strictly controlled within 50ms.

At the same time, in the actual ring network protection scheme, to achieve smooth migration of services, it is necessary to rely on a clear delivery process and rich experience guidance to avoid possible cutover risks in the early stage.

Curing process, long-term operation and maintenance

After the ring network protection goes online, it is undoubtedly an important weapon for reducing the incidence of failures. But at the same time, reducing the operation and maintenance cost due to new features in daily operation and maintenance is a problem that must be considered. Huawei's ring network protection solution can use professional methods, such as routine tool inspection, to periodically check and maintain the operation of the ring network protection in the existing network, so as to detect problems as early as possible and reduce potential network risks . At the same time, it will solidify the excellent operation and maintenance experience into the process in time, so that the technical ability of the maintenance personnel of the current network can quickly reach the standard.

It can be seen that the P TN ring network protection solution makes the network more reliable, not only because of its enhanced protection features, but also its own effective implementation process, end-to-end guarantees the security and efficiency of network and service migration It also provides ring network protection with long-term maintenance capabilities, providing better protection for the network and services.

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