1拓扑结构:

该网络结构有几个关键点:VRRP、STP、NQA

当核心1检测202.106.0.20失败时,nqa联动 track 对核心sw1 的priority进行减80,核心sw2获取vrip,从而接入层用户优先从核心sw2出。当核心sw1检测202.106.0.20成功时,sw1的 priority恢复150,sw1 重新获取vrip


以下是部分配置


核心sw1


#

interface Vlan-interface831

description 2F-1

ip address 192.168.20.253 255.255.255.0

vrrp vrid 25 virtual-ip 192.168.20.254

vrrp vrid 25 priority 150

vrrp vrid 25 timer advertise 2

#track 1 联动 vrid 自动减1,从而sw2获取vip:192.168.20.254

vrrp vrid 25 track 1 reduced 80

dhcp select relay

dhcp relay server-select 1


#创建 admin test 策略

nqa entry admin test

#类型icmp检测

type icmp-echo

#检测地址ip

 destination ip 202.106.0.20

#检测频率

 frequency 100

 reaction 1 checked-element probe-fail threshold-type consecutive 5 action-type trigger-only

#track联动

track 1 nqa entry admin test reaction 1

#nqa策略admin test 启动

nqa schedule admin test start-time now lifetime forever


核心sw2


#

interface Vlan-interface831

description 2F-1

ip address 192.168.20.252 255.255.255.0

vrrp vrid 25 virtual-ip 192.168.20.254

vrrp vrid 25 priority 110

vrrp vrid 25 timer advertise 2

dhcp select relay

dhcp relay server-select 1