最新路由交换测试技术介绍

IPTV,IP电话和P2P等业务的快速发展使路由交换设备的测试也更加复杂,传统的路由表容量测试,交换转发能力测试以及振荡测试已经不能满足功能强大的路由交换设备的测试要求。本文着重介绍了当前流行或最新的MulticastVPN测试、4～7层业务运行在动态路由表之上的QoE测试、BFD协议测试、路由协议的GR特性测试和QoS重标记性能测试技术,并对IXIA的方案特点做了总结。     

A KAD Network Evolution Model Based on Node Behavior

An evolution model of KAD Dynamic Model Network （KDMN） is proposed to study the reason of hot node and simulate the process of network evolution based on node behavior from a holistic perspective. First, some symbols and meanings are introduced to describe nodes relationship and network states at a time step. Second, some evolution rules for network are formulated when node behaviors of join, exit, routing table update, data retrieval and content index distribution happen with different contextual scene in KAD network. In addition, a lightweight simulator is designed to implement the KDMN model. Moreover, an example of how to use the simulator to simulate the network changes in order to observe the result is described in detail. Finally, the KDMN is applied to analyze the reason for the formation of hot nodes in the BT and eMule network in the experiment. The different evolution principles of local priority, global priority and hybrid random are adopted based on the provision of network protocol of BT and eMule. The result of this experiment demonstrates that there are some hot nodes exist in the KAD network. However, the principle of hybrid random can effectively alleviate the phenomenon that a node is widely linked with others compared with global and local priority.     

浅析OSPF动态路由协议

对目前在通信基础网络中广泛使用的OSPF动态路由协议进行分析,从路由表、动态路由协议、OSPF路由算法、OSPF网络规划等方面分别进行了阐述,为优化网络结构,提高网络管理水平打下基础。