本技术报告讨论了支持提供所需服务可用性的网络可靠性设计方法。可靠性设计是主动网络可靠性和弹性规划的基础；TR描述了完成这项关键任务的方法。为了能够对给定网元（NE）的适当可靠性级别做出更明智的决策，它引入了重要故障点（SgPoF）度量。在设计过程中提前计算SgPoF，然后实施推荐设计，将节省资本支出（CapEx），并降低可靠性设计过程后期发生的设计变更相关成本。

This Technical Report discusses design for network reliability methodology that supports the delivery of desired service availability. Design for reliability is fundamental to proactive network-reliability and resiliency planning; the TR describes a methodology for approaching this key task. To enable a more informed decision on the appropriate reliability-level for a given network-element (NE) it introduces the Significant Point of Failure (SgPoF) metric. Early computation of the SgPoF in the design process, followed by the implementation of the recommended design will result in Capital Expenditure (CapEx) savings and reduce the cost associated with design changes that occur late in the design for reliability process.