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这次VRRP配置试验使用的设备：二台交换机（分别为SwitchA和SwitchB），二台路由器（分别为RouterA和RouterB）。
SwitchA vlan1 ip 192.168.1.1 255.255.255.0
SwitchB vlan1 ip 10.10.1.4 255.255.255.0
SwitchB vlan2ip 10.10.1.5 255.255.255.0
RouterA g0/3 ip 192.168.1.2 255.255.255.0
RouterA g0/5 ip 10.10.1.2 255.255.255.0
RouterB g0/3 ip 192.168.1.3 255.255.255.0
RouterB g0/5 ip 10.10.1.3 255.255.255.0
虚拟网关地址：192.168.1.100 255.255.255.0
一、配置IP地址划分VLAN并测试连通性
略。
二、配置VRRP的实验和六个步骤
1、创建VRRP一个序号为1的虚拟路由器
2、为虚拟路由器添加IP地址（即PC网关地址）
3、配置优先级
4、配置跟踪端口设置递减值
5、配置认证字符串
6、配置为抢占模式
hostname RouterA
interface Giga Ethernet0/3
ipaddress 192.168.1.3 255.255.255.0
vrrp1 associate 192.168.1.100 255.255.255.0
vrrp1 authentication DCN
vrrp1 priority 150
vrrp1 trackinterface Giga Ethernet0/510
interface Giga Ethernet0/5
ipaddress 10.10.1.2 255.255.255.0
hostname RouterB
interface Giga Ethernet0/3
ipaddress 192.168.1.100 255.255.255.0
vrrp1 associate 192.168.1.100 255.255.255.0
vrrp1 authentication DCN
vrrp1 priority150
vrrp1 trackinterface Giga Ethernet0/510
interfaceGiga Ethernet0/5
ipaddress 10.10.1.3 255.255.255.0
实验结果：
RouterA_config#showvrrp
Giga Ethernet0/3-Group1
VRRP Stateis BACKUP
Virtual IP address:192.168.1.2/24
Virtual Macaddress:0000.5e00.0101
Current Priority:150(Config150)
VRRPtimer:Advertise1.0s(default)master_down3.4s
VRRPcurrenttimer:Advertise0.5smaster_down2.9spreemptafter0.0s
Authenticationstringis:fbyu
Preemptisset(delay:0s)
Learn Advertise Intervalisnotset
MasterRouterIP: 192.168.1.200,priority:150,advertisment:1.0s
Trackinterface:InterfaceDecrementState
Giga Ethernet0/510UP
Router_config#showvrrp
Giga Ethernet0/3-Group1
VRRP StateisMaster
Virtual IP address:192.168.1.2/24
Virtual Mac address:0000.5e00.0101
CurrentPriority:150(Config150)
VRRPtimer:Advertise1.0s(default)master_down3.4s
VRRPcurrenttimer:Advertise1.0smaster_down0.0spreemptafter0.0s
Authenticationstringis:fbyu
Preemptisset(delay:0s)
LearnAdvertiseIntervalisnotset
Master Router IP:192.168.1.200,priority:150,advertisment:1.0s
Trackinterface:InterfaceDecrementState
Giga Ethernet0/510UP
至此，这次试验就算是圆满的完成了。上面就是相信的配置命令行和返回的结果。 | 
