Technology trends such as Software-Defined Networking (SDN) are transforming networking services in terms of flexibility and faster deployment times. SDN separates the control plane from the data plane with its centra...Technology trends such as Software-Defined Networking (SDN) are transforming networking services in terms of flexibility and faster deployment times. SDN separates the control plane from the data plane with its centralised architecture compared with the distributed approach used in other management systems. However, management systems are still required to adapt the new emerging SDN-like technologies to address various security and complex management issues. Simple Network Management Protocol (SNMP) is the most widespread management protocol implemented in a traditional Network Management System (NMS) but has some limitations with the development of SDN-like services. Hence, many studies have been undertaken to merge the SDN-like services with traditional network management systems. Results show that merging SDN with traditional NMS systems not only increases the average Management Information Base (MIB) polling time but also creates additional overheads on the network. Therefore, this paper proposes a dynamic scheme for MIB polling using an additional MIB controller agent within the SDN controller. Our results show that using the proposed scheme, the average polling time can be significantly reduced (i.e., faster polling of the MIB information) and also requires very low overhead because of the small sized OpenFlow messages used during polling.展开更多
自1978年功能点分析(function point analysis,FPA)度量问世以来,其作为一个比较流行的方法,在软件开发的前期计划及过程改进中起到至关重要的作用。而当前的状况却是其飞速发展的软件产业急需软件度量,但软件功能点度量,特别是FPA方法...自1978年功能点分析(function point analysis,FPA)度量问世以来,其作为一个比较流行的方法,在软件开发的前期计划及过程改进中起到至关重要的作用。而当前的状况却是其飞速发展的软件产业急需软件度量,但软件功能点度量,特别是FPA方法,难以在实际中进行应用,因此诞生了诸如E&QFP、NESMA、SimplifiedFP、ISBSG、ILF model、Early FP和Si FP等简化方法来弥补传统方法的不足。根据这些方法所采用的技术原理对简化方法进行了分类简述。然后从基本功能组件、基本功能组件粒度、捕捉功能组件的难易程度、权重值和度量过程等5个方面对简化的度量方法进行了比较。通过比较分析,使得用户可以对目前存在的简化方法有更深入的理解,用户可以根据自己实际需要选用恰当的方法,甚至构建自己专有的简化方法。展开更多
文摘Technology trends such as Software-Defined Networking (SDN) are transforming networking services in terms of flexibility and faster deployment times. SDN separates the control plane from the data plane with its centralised architecture compared with the distributed approach used in other management systems. However, management systems are still required to adapt the new emerging SDN-like technologies to address various security and complex management issues. Simple Network Management Protocol (SNMP) is the most widespread management protocol implemented in a traditional Network Management System (NMS) but has some limitations with the development of SDN-like services. Hence, many studies have been undertaken to merge the SDN-like services with traditional network management systems. Results show that merging SDN with traditional NMS systems not only increases the average Management Information Base (MIB) polling time but also creates additional overheads on the network. Therefore, this paper proposes a dynamic scheme for MIB polling using an additional MIB controller agent within the SDN controller. Our results show that using the proposed scheme, the average polling time can be significantly reduced (i.e., faster polling of the MIB information) and also requires very low overhead because of the small sized OpenFlow messages used during polling.
基金Grants Visiting Scholar Project from the National Lab in Nanjing Agricultural University (ZW2007005)the National High-tech Program(2006AA10Z111)+1 种基金the Program for New Century Excellent Talents in University(NCET-04-0500)the 111 Program for Ministry of Education (B08025)
