Challenges of IP + optical collaboration

The challenges faced by IP + optical collaboration occasionally encounter the concept of IP + optical collaboration in the broadband operation process of enterprises. I would like to give a brief explanation here. I hope you will learn more about this. According to our statistical forecast, www.2cto.com's IP traffic growth rate is three times higher than that in 18 months, and has already exceeded Moore's Law ". The increase in traffic is mainly driven by broadband services such as video. For example, China Telecom's 163 backbone network requires network expansion every year due to rapid traffic growth. The traditional expansion method is mainly implemented by adding network nodes and network layers, which leads to soaring CAPEX and OPEX. In the case of slow revenue growth, the operator's profit margin will decrease. In order to achieve reasonable bandwidth costs, the IP backbone network architecture should evolve towards a flat and fully interconnected architecture. From the trend of technological development, the IP layer and the optical layer are continuously integrated and have gone through four stages of development. The first stage is IP over DWDM, the second stage is IP over OTN, the third stage is IP over OTN/ASON, and the fourth stage is "IP + optical collaboration ", its main feature is to achieve interconnection between the IP layer and the transport layer through UNI, and optimize multi-layer networks to achieve reasonable network construction costs and bandwidth costs, so as to meet the challenges of the post-moer era. "IP + light collaboration" poses a new challenge to O & M. "IP + light collaboration" can be summarized as traffic collaboration, protection collaboration, and O & M collaboration. Traffic Coordination, that is, multi-layer network optimization, refers to joint optimization across IP addresses and transport layers through physical ports or cOTN/VLAN sub-interfaces, transmit the lambda or ODUk-level business Bypass to a cheaper transport layer. Protection collaboration is to enhance the protection cooperation between IP addresses and transmission networks to improve network reliability. Through network management, O & M Collaboration enables end-to-end multi-layer network planning, network optimization, service distribution, and monitoring and troubleshooting on the entire backbone network to improve O & M efficiency. At the same time, O & M collaboration is also an effective means to achieve traffic coordination and protection collaboration, so that the GMPLS-UNI interface and PCE to achieve better coordination of the IP layer and the optical layer. Effective coordination of management systems can minimize the TCO of operators. From the above three aspects, "IP + optical collaboration" poses some new challenges to O & M. Challenge 1: Statistics on cross-layer network traffic and protection planning difficulties show that more than 50% of the Core Router Traffic is through traffic. As traffic increases, vrouters are constantly resized, resulting in high resizing costs. We know that DWDM/OTN is cheaper than IP (router) at the same rate. Therefore, the basic idea of traffic optimization is: large particle businesses are directly transmitted through the transport layer (DWDM/OTN), known as Offload or Bypass. Small particle businesses are still carried by routers for statistical reuse. Bypass uses cheaper wavelength division devices to relieve the resizing pressure on core routers and reduce the number of hops forwarded by services. This not only reduces the whole network cost, but also improves the service quality. To optimize a Bypass-based smart network, three cross-layer network planning problems must be solved. The first is the multi-layer ing problem. Due to the many layers of business ing, covering IP/MPLS, ODUk, and WDM, cross-layer planning must meet the performance and reliability requirements of each layer, and minimize the overall bandwidth demand. The second is the multi-layer protection and routing cost problem. An optical layer failure may cause multiple faults on the IP layer. Cross-layer planning must ensure the SRLG (Sharing Risk Link Group) Isolation of the IP layer Link; because the IP layer and optical layer have service protection, a large number of multi-layer redundancy protection on the current network needs to be avoided. The third is traffic direction at the optical layer. During cross-layer planning, we should consider distributing traffic at the IP layer through a light layer with a relatively low cost to reduce the overall cost of the backbone network. Challenge 2: Cross-layer service opening and deployment efficiency is low www.2cto.com business activation process is: new business or business expansion bandwidth is not enough, the router through the GMPLS-UNI to send a request to the transmission device; if the transport layer has sufficient resources, a connection is automatically established. This process needs to solve two problems. First, the management and service activation of the entire network involves at least the transmission O & M department, data O & M department, Network Monitoring Department, or network maintenance department. A unified management system is required to achieve efficient cooperation between different departments, reduce human errors and ensure accurate information transmission and synchronization. Second, the IP network configuration is complex, and "IP + optical collaboration" further improves the complexity and needs to effectively improve the configuration and management efficiency. Challenge 3: root-cause alarms are drowned in a large number of derivative alarms, making it difficult to quickly troubleshoot. According to the actual network O & M statistics of a large European operator, faults at the transport layer will generate about 10 times of alarms at the router layer, in the face of these massive alarms, operators have almost no way to locate network faults. However, in general, only part of the massive amount of alarm information is the source alarm. The problem to be solved here is how to use a unified alarm database and automatic alarm Association Analysis to shield secondary and low-level alarms, quickly locate network faults, and improve O & M efficiency.