vrrp能夠在不改變組網的情況下，將多台路由器虛擬成乙個虛擬路由器，通過配置虛擬路由器的ip位址為預設閘道器，實現閘道器的備份。
協議版本：vrrpv2 和vrrpv3
vrrpv2僅適用於ipv4網路，vrrpv3適用於ipv4和ipv6網路
開啟vrrp的裝置有三種狀態：
##sw3##
[sw3]vlan bat 10 20
info: this operation may take a few seconds. please wait for a moment...done.
[sw3]int e0/0/1
[sw3-ethernet0/0/1]p l a
[sw3-ethernet0/0/1]p d v 10
[sw3-ethernet0/0/1]un sh
info: inte***ce ethernet0/0/1 is not shutdown.
[sw3-ethernet0/0/1]int e0/0/2
[sw3-ethernet0/0/2]p l a
[sw3-ethernet0/0/2]p d v 20
[sw3-ethernet0/0/2]un sh
info: inte***ce ethernet0/0/2 is not shutdown.
[sw3-ethernet0/0/2]int g0/0/1
[sw3-gigabitethernet0/0/1]p l t
[sw3-gigabitethernet0/0/1]p t a v 10 20
[sw3-gigabitethernet0/0/1]un sh
info: inte***ce gigabitethernet0/0/1 is not shutdown.
[sw3-gigabitethernet0/0/1]int g0/0/2
[sw3-gigabitethernet0/0/2]p l t
[sw3-gigabitethernet0/0/2]p t a v 10 20
[sw3-gigabitethernet0/0/2]un sh
info: inte***ce gigabitethernet0/0/2 is not shutdown.
##sw1##[sw1]vlan bat 10 20 100
info: this operation may take a few seconds. please wait for a moment...done.
[sw1]int g0/0/1
[sw1-gigabitethernet0/0/1]p l a
[sw1-gigabitethernet0/0/1]p d v 100
[sw1-gigabitethernet0/0/1]un sh
info: inte***ce gigabitethernet0/0/1 is not shutdown.
[sw1-gigabitethernet0/0/1]int g0/0/2
[sw1-gigabitethernet0/0/2]p l t
[sw1-gigabitethernet0/0/2]p t a v 10 20
[sw1-gigabitethernet0/0/2]un sh
info: inte***ce gigabitethernet0/0/2 is not shutdown.
[sw1-gigabitethernet0/0/2]int vlanif10
[sw1-vlanif10]ip add 192.168.10.10 24
[sw1-vlanif10]vrrp vrid 1 virtual
[sw1-vlanif10]vrrp vrid 1 virtual-ip 192.168.10.1
[sw1-vlanif10]vrrp vrid 1 priority 120
[sw1-vlanif10]vrrp vrid 1 track inte***ce g0/0/1
[sw1-vlanif10]vrrp vrid 1 track inte***ce g0/0/2
[sw1-vlanif10]int vlanif20
[sw1-vlanif20]ip add 192.168.20.10 24
[sw1-vlanif20]vrrp vrid 2 virtual-ip 192.168.20.1
[sw1-vlanif20]vrrp vrid 2 priority 115
[sw1-vlanif20]int vlanif 100
[sw1-vlanif100]ip add 11.0.0.2 30
[sw1-vlanif100]q
[sw1]ip route-static 0.0.0.0 0.0.0.0 11.0.0.1
##sw2##[sw2]vlan bat 10 20 100
info: this operation may take a few seconds. please wait for a moment...done.
[sw2]int g0/0/1
[sw2-gigabitethernet0/0/1]p l a
[sw2-gigabitethernet0/0/1]p d v 100
[sw2-gigabitethernet0/0/1]un sh
info: inte***ce gigabitethernet0/0/1 is not shutdown.
[sw2-gigabitethernet0/0/1]int g0/0/2
[sw2-gigabitethernet0/0/2]p l t
[sw2-gigabitethernet0/0/2]p t a v 10 20
[sw2-gigabitethernet0/0/2]un sh
info: inte***ce gigabitethernet0/0/2 is not shutdown.
[sw2-gigabitethernet0/0/2]int vlanif 10
[sw2-vlanif10]ip add 192.168.10.20 24
[sw2-vlanif10]vrrp vrid 1 virtual-ip 192.168.10.1
[sw2-vlanif10]vrrp vrid 1 priority 115
[sw2-vlanif10]int vlanif20
[sw2-vlanif20]ip add 192.168.20.20 24
[sw2-vlanif20]vrrp vrid 2 virtual-ip 192.168.20.1
[sw2-vlanif20]vrrp vrid 2 priority 120
[sw2-vlanif20]vrrp vrid 2 track inte***ce g0/0/1
[sw2-vlanif20]vrrp vrid 2 track inte***ce g0/0/2
[sw2-vlanif20]int vlanif100
[sw2-vlanif100]ip add 12.0.0.2 30
[sw2-vlanif100]q
[sw2]ip route-static 0.0.0.0 0.0.0.0 12.0.0.1
##r1##[r1]int g0/0/0
[r1-gigabitethernet0/0/0]ip add 11.0.0.1 30
[r1-gigabitethernet0/0/0]int g0/0/1
[r1-gigabitethernet0/0/1]ip add 12.0.0.1 30
[r1-gigabitethernet0/0/1]int loo 0
[r1-loopback0]ip add 1.1.1.1 24
[r1]ip route-static 192.168.10.0 24 11.0.0.2
[r1]ip route-static 192.168.10.0 24 12.0.0.2 pre 70
[r1]ip route-static 192.168.20.0 24 12.0.0.2
[r1]ip route-static 192.168.20.0 24 11.0.0.2 pre 70
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