1、Server Load Balancing飛雅高科技李村負載平衡器的介紹Load BalancerInternet UsersServer 1Server 2Server 3負載平衡器的功能：攔截網路層流量（像網頁流量）重導至不同的位置。分割流量成為單一的要求和決定由那一個伺服器來接收這個單一的要求。檢查伺服器的可用狀態，確保要求可以被回應。當設備發生故障或無法提供服務時，可對使用者提供一個以上的備援。對已知內容做分配（經由讀取URL、攔截cookies 和剖析XML）。DNS Based 負載平衡.INA.INA.INA.INA208.185.43.204使用nslookupdns#nslo
2、okup Server：Address：198.143.25.15Name：Addresses：208.185.43.202,208.185.43.203,208.185.43.204http:/InternetServer 1208.185.43.202Server 2208.185.43.203Server 3208.185.43.204設備故障或無法回應時InternetServer 1208.185.43.202Server 2208.185.43.203Server 3208.185.43.204X三個重要的效益n靈活性n提高可用性n擴充能力Firewall Load Balanci
3、ngLoad BalancerLoad BalancerProtected Intranet NetworkInternetFirewallFirewallFirewallGlobal Server Load BalancingSite ISite IISite IIIULocal DNSRouter3-DNSBIG-IPBIG-IPClustering（Application-based）InternetServer with Software AgentServer with Software AgentServer with Software AgentServer with Softw
4、are AgentOSI layers and SLBOSI LayerFunctionUnitsExampleLayer 3NetworkIP addressesRoutersLayer 4TransportTCP,UDP,ICMPTCP port 80 for HTTP,UDP port 161 for SNMPLayers 57Session,presentation,and applicationURL,cookiehttp:/ or cookiesRedundancyActive StandbyActive ActiveVRRPVirtual ServersInternetVirtu
5、al ServerPoolsInternetClientsRouterBIG-IP ControllerServersHealth MonitorsInternet192.168.20.3:80SLB應用基本架構SLB應用基本架構Load BalancerInternetFirewallFirewallFirewallEthernetEthernetSLB應用基本架構Load BalancerRouterRouterInternetInternetISP2ISP1SLB應用基本架構Load BalancerInternetFirewallFirewallFirewallEthernetEthernetLoad Balancer
