VRRP:virtual routeredundancy protocol
优先级默认为100,当优先级一样,比较IP地址
优先级高得为master,1-255,
255是不能指定的,当虚拟的网关地址和真实的route的ip地址相同时,会将该路由器的优先级升级为255
配置单个虚拟路由器:
RTA:
Interface Ethernet 0/0
Ip address 10.1.1.254 24
Vrrp vrid 1 virtual-ip 10.1.1.254(虚拟ip地址)
RTB:
Interface Ethernet 0/0
Ip address 10.1.1.252 24
Vrrp vrid 1 virtual-ip 10.1.1.254
Vrrp vrid 1 priority 200(设置优先级)
Interface Ethernet 0/0
Vrrp vrid 1 track interface Ethernet 1/0reduced 150(追踪Ethernet 1/0状态,当Ethernet 1/0出现问题,优先级会减少150)
试验:
按照图片配置
交换机gigabitEthernet0/0/1和gigabitEthernet 0/0/2为trunk口
Ethernet 0/0/1和 Ethernet 0/0/2为access口
AR1的命令:
Sy
Sy SW1
Interface gigabitEthernet 0/0/2
Ip address 192.168.1.253 24
Vrrp vrid 1 virtual-ip 192.168.1.254
Vrrp vrid 1 priority 200
Vrrp vrid 1 preempt-mode disable
Interface gigabitEthernet 0/0/0
Ip address 13.1.1.1 24
Quit
Ip route-static 3.0.0.0 8 13.1.1.2
Interface gigabitEthernet 0/0/2
vrrp vrid 1 track interface GigabitEthernet0/0/0 reduced 150
AR2命令:
Sy
Sy SW1
Interface gigabitEthernet 0/0/2
Ip address 192.168.1.252 24
Vrrp vrid 1 virtual-ip 192.168.1.254
Vrrp vrid 1 priority 150
Vrrp vrid 1 preempt-mode timer delay 20
Interface gigabitEthernet 0/0/0
Ip address 23.1.1.2 24
Quit
Ip route-static 3.0.0.0 8 23.1.1.3
AR3上的命令:
Sy
Sy AR3
Interface loopback0
Ip address 3.3.3.38
InterfacegigabitEthernet 0/0/0
Ip address13.1.1.3 24
InterfacegigabitEthernet 0/0/1
Ip address 23.1.1.1324
Quit
Ip route-static192.168.1.0 24 13.1.1.1
Ip route-static192.168.1.0 24 23.1.1.2
测试:
PC1去PING AR3的环回口3.3.3.3
ShutdownAR1的gigabitEthernet 0/0/0口,依旧可以PING通