HSRP与链路追踪

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1、链路追踪的概念：当网络中存在着HSRP的备份路由器时，可以配置HSRP的上行链路追踪，当指定的追踪接口down掉时，马上减小该HSRP设备的优先级，使另一个备份设备能马上被激活成为ACTIVE状态，并接替down掉的设备继续引导路由数据，实现网络的畅通性拓扑规划：案例实施：1）、各设备配置：R1配置：interfaceLoopback0ipaddress202.102.12.1255.255.255.0interfaceSerial1/0ipaddress172.16.0.1255.255.255.252serialrestart-dela

2、y0clockrate64000!interfaceSerial1/1ipaddress172.16.0.5255.255.255.252serialrestart-delay0clockrate64000R2配置：interfaceFastEthernet0/0.10encapsulationdot1Q10ipaddress192.168.10.1255.255.255.0ipnatinsideipvirtual-reassemblystandby10ip192.168.10.254standby10priority120standby1

3、0preemptstandby10trackSerial1/030!interfaceFastEthernet0/0.20encapsulationdot1Q20ipaddress192.168.20.1255.255.255.0ipnatinsideipvirtual-reassemblystandby20ip192.168.20.254standby20preemptinterfaceSerial1/0ipaddress172.16.0.2255.255.255.252ipnatoutsideipvirtual-reassemblyse

4、rialrestart-delay0iproute0.0.0.00.0.0.0Serial1/0ipnatinsidesourcelist100interfaceSerial1/0overloadR3配置：interfaceFastEthernet0/0.10encapsulationdot1Q10ipaddress192.168.10.2255.255.255.0ipnatinsideipvirtual-reassemblystandby10ip192.168.10.254standby10preempt!interfaceFastEth

5、ernet0/0.20encapsulationdot1Q20ipaddress192.168.20.2255.255.255.0ipnatinsideipvirtual-reassemblystandby20ip192.168.20.254standby20priority120standby20preemptstandby20trackSerial1/130interfaceSerial1/1ipaddress172.16.0.5255.255.255.252ipnatoutsideipvirtual-reassemblyserialr

6、estart-delay0iproute0.0.0.00.0.0.0Serial1/1ipnatinsidesourcelist100interfaceSerial1/1overloadSw1配置：interfaceFastEthernet0/0switchportmodetrunk!interfaceFastEthernet0/1switchportmodetrunk!interfaceFastEthernet0/2switchportmodetrunk!interfaceFastEthernet0/3switchportaccessvl

7、an10!interfaceFastEthernet0/4switchportaccessvlan20vlandatabasevlan10vlan20Sw2配置：interfaceFastEthernet0/0switchportmodetrunk!interfaceFastEthernet0/1switchportmodetrunk!interfaceFastEthernet0/2switchportmodetrunk!interfaceFastEthernet0/3switchportaccessvlan10!interfaceFast

8、Ethernet0/4switchportaccessvlan20vlandatabasevlan10vlan20PC1配置：noiproutinginterfaceFastEt