2 介绍校园网.ppt

Network RequirementsIntelligent Information Network智能化的信息网络(IIN)整合了网络资源和信息资产.IIN 扩展了多个产品和多个层次结构,使网络更加智能化.IIN 积极参与网络的应用和服务.构建一个IIN网络的三个阶段:集成的传输集成的服务集成的应用Cisco SONA FrameworkThe Cisco Service-Oriented Network Architecture(SONA)is an architectural framework.SONA 为企业提供几个优势条件:1，描述企业如何向IIN网络发展 2，阐明如何在充分聚合智能化的网络上构建整合系统。3，改进适应性和增大效率。Cisco SONA Framework LayersCisco Enterprise Architecture大的冲突域大的冲突域大的广播域大的广播域较高的延迟较高的延迟故障排除复杂故障排除复杂Nonhierarchical Network DevicesIssuesNo traffic between VLANsUnbounded broadcast domainServers not centrally located基于硬件的桥接；基于硬件的桥接；线速的性能线速的性能每端口冲突域每端口冲突域分组转发分组转发 on MAC on MAC addressaddressLayer 2 Switching每端口一个广播域每端口一个广播域在不同的网段之间，在不同的网段之间，可以应用可以应用ACLACL进行控进行控制制.IssuesHigh per-port costLayer 3 processing requiredHigh latency over Layer 2 switchingLayer 3 RoutingCombinedfunctionalityLayer 2 switchingLayer 3 switchingLayer 4 switchingLow latencyHigh-speed scalabilityMultilayer SwitchingSingle point of failure for Layer 2 and Layer 3Underutilization of hardwareSpanning tree complexityServers not centrally locatedMultilayer Switchesin a Nonhierarchical NetworkHierarchical Campus ModelECNM Functional AreasEnterprise Composite Network ModelModules in the Enterprise CampusCampus Infrastructure ModuleSwitch Configuration InterfacesTwo interfaces are used to configure Cisco Catalyst switches:Cisco Catalyst softwareCAT OSCisco IOSCisco Catalyst software was traditionally used to configure Layer 2 parameters on the modular switches:Cisco Catalyst 4000,5500,6500 Series These switches now support Cisco IOS(native IOS)Cisco IOS software is standard for most other switches and for Layer 3 configuration on the modular switches.Cisco Catalyst Software Cisco Catalyst software is used to configure Layer 2 parameters.Cisco Catalyst software configuration commands are prefaced with the keyword set.Console(enable)set port enable 3/5 Layer 3 configuration is implemented on MSFC with the Cisco IOS interface.Some platforms can now use the Cisco IOS interface to configure both Layer 2 and Layer 3(native IOS).Cisco Catalyst 4500 and 6500 switchesCisco IOS InterfaceOn most Catalyst switches,Cisco IOS interface is standard forLayer 2 configurationLayer 3 configuration on multilayer switchSummaryThe SONA 构架引导企业网络向IIN发展.Cisco 企业网体系结构是一个分层的网络模块，促进部署会聚的网络。不分层的网络设计在现代企业网络中难以升级,不能够提供足够的安全性,Layer 2 网络构架不能提供适当的安全和分层的网络.基于路由的网络构架,可以提供更大的安全和分层的网络设计.但是,其有较大的延迟！