Designing an Ethernet switch that can assure normal interaction of protocol packets between switches in a network environment of massive traffic is an important matter. Taking the L3 Ethernet switch based on Applicati...Designing an Ethernet switch that can assure normal interaction of protocol packets between switches in a network environment of massive traffic is an important matter. Taking the L3 Ethernet switch based on Application Specific Integrated Circuit (ASIC) as an example,this article analyzes several typical issues about packet receiving and sending by the CPU in a multi-progress environment,including CPU load,software and hardware queue settings,and communication mechanism between CPU and the switch chip. This article gives solutions to these issues mentioned above. The solutions are applicable to Network Processor (NP) issues as well.展开更多
对现有的 IPVPN 的三种互连方案进行讨论,并指出了这三种方案的主要缺点是:硬件成本较高,集中讨论了有关虚拟路由器的概念、协议、功能及虚拟路由器的 IP VPN 构建方案,重点讨论了使用虚拟路由器连接和实现 IP VPN 的三种方案,第二层的...对现有的 IPVPN 的三种互连方案进行讨论,并指出了这三种方案的主要缺点是:硬件成本较高,集中讨论了有关虚拟路由器的概念、协议、功能及虚拟路由器的 IP VPN 构建方案,重点讨论了使用虚拟路由器连接和实现 IP VPN 的三种方案,第二层的虚拟路由器到虚拟路由器的连接方案、多个虚拟路由器聚合到一个虚拟路由器上的方案、多个骨干网的聚合虚拟路由器到聚合虚拟路由器连接方案。展开更多
Resistive switching （RS） behaviors of Dy2O3- based memory devices with and without Pt nanocrystals （Pt-nc） layer were investigated for nonvolatile memory applications. The Cu/Pt-nc/Dy2O3/Pt memory exhibits excelle...Resistive switching （RS） behaviors of Dy2O3- based memory devices with and without Pt nanocrystals （Pt-nc） layer were investigated for nonvolatile memory applications. The Cu/Pt-nc/Dy2O3/Pt memory exhibits excellent unipolar RS characteristics, including highly uniform switching parameters, lower switching voltage （〈1.2 V）, high resistance ratio （〉1 × 104）, a large number of switching cycles, as well as long retention time （〉1 × 105 s）, owing to the local electric field confined and strengthened near the nanocrystals＇ location.展开更多
文摘Designing an Ethernet switch that can assure normal interaction of protocol packets between switches in a network environment of massive traffic is an important matter. Taking the L3 Ethernet switch based on Application Specific Integrated Circuit (ASIC) as an example,this article analyzes several typical issues about packet receiving and sending by the CPU in a multi-progress environment,including CPU load,software and hardware queue settings,and communication mechanism between CPU and the switch chip. This article gives solutions to these issues mentioned above. The solutions are applicable to Network Processor (NP) issues as well.
文摘对现有的 IPVPN 的三种互连方案进行讨论,并指出了这三种方案的主要缺点是:硬件成本较高,集中讨论了有关虚拟路由器的概念、协议、功能及虚拟路由器的 IP VPN 构建方案,重点讨论了使用虚拟路由器连接和实现 IP VPN 的三种方案,第二层的虚拟路由器到虚拟路由器的连接方案、多个虚拟路由器聚合到一个虚拟路由器上的方案、多个骨干网的聚合虚拟路由器到聚合虚拟路由器连接方案。
基金financially supported by the National Natural Science Foundation of China(Nos.50932001,51102020,and 51202013)the Important National Science&Technology Specific Projects(No.2009ZX02039-005)
文摘Resistive switching （RS） behaviors of Dy2O3- based memory devices with and without Pt nanocrystals （Pt-nc） layer were investigated for nonvolatile memory applications. The Cu/Pt-nc/Dy2O3/Pt memory exhibits excellent unipolar RS characteristics, including highly uniform switching parameters, lower switching voltage （〈1.2 V）, high resistance ratio （〉1 × 104）, a large number of switching cycles, as well as long retention time （〉1 × 105 s）, owing to the local electric field confined and strengthened near the nanocrystals＇ location.
