12.3 VRRP的配置
【需求】
pc机网关指向两台路由器的虚ip。两台路由器用vrrp实现主机备份。
【组网图】
【配置脚本】
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RouterA配置脚本 |
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# sysname RouterA # vrrp
ping-enable
/使能VRRP ping/ # radius scheme system # domain system # interface Ethernet1/0/0 ip address 10.0.0.1 255.255.255.0 vrrp vrid 1 virtual-ip
10.0.0.254 /配置虚ip/ vrrp vrid 1 priority
120 /设置优先级120，高于100/ vrrp vrid 1 track Serial2/0/0 reduced 30 /设置监视接口/ # interface Serial2/0/0 link-protocol ppp ip address 20.0.0.2 255.255.255.252 # interface NULL0 # ip route-static 0.0.0.0 0.0.0.0
20.0.0.1 preference 60 # user-interface con 0 user-interface vty 0 4 # return |
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RouterB配置脚本 |
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# sysname RouterB # vrrp
ping-enable
/使能VRRP ping/ # radius scheme system # domain system # interface Ethernet1/0/0 ip address 10.0.0.2 255.255.255.0 vrrp vrid 1 virtual-ip 10.0.0.254 /配置虚ip,优先级默认为100/ # interface Serial2/0/0 link-protocol ppp ip address 20.0.0.6 255.255.255.252 # interface NULL0 # ip route-static 0.0.0.0 0.0.0.0
20.0.0.5 preference 60 # user-interface con 0 user-interface vty 0 4 # return |
【验证】
正常情况下查看RouterA、RouterB的VRRP状态如下：
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RouterA状态 |
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[RouterA]disp vrrp Virtual Ip Ping : Enable Ethernet1/0/0 | Virtual Router 1 state : Master Virtual IP : 10.0.0.254 Config Priority : 120 Run Priority : 120 Preempt : YES
Delay Time : 0 Timer : 1 Auth Type : NONE Track IF : Serial2/0/0
Priority reduced : 30 |
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RouterB状态 |
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[RouterB]disp vrrp Virtual Ip Ping : Enable Ethernet1/0/0 | Virtual Router 1 state : Backup Virtual IP : 10.0.0.254 Config Priority : 100 Run Priority : 100 Preempt : YES Delay Time : 0 Timer : 1 Auth Type : NONE |
当RouterA上行口S2/0/0 down后查看RouterA、RouterB的VRRP状态如下：
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RouterA状态 |
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[RouterA]disp vrrp Virtual Ip Ping : Enable Ethernet1/0/0 | Virtual Router 1 state : Backup Virtual IP : 10.0.0.254 Config Priority : 120 Run Priority : 90 Preempt : YES Delay Time : 0 Timer : 1 Auth Type : NONE Track IF : Serial2/0/0 Priority reduced :
30 |
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RouterB状态 |
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[RouterB]disp vrrp Virtual Ip Ping : Enable Ethernet1/0/0 | Virtual Router 1 state : Master Virtual IP : 10.0.0.254 Config Priority : 100 Run Priority : 100 Preempt : YES Delay Time : 0 Timer : 1 Auth Type : NONE |
【提示】
1、 如不配置vrrp ping-enable，会出现无法ping网关的现象，但是转发正常。
2、 VRRP的默认工作在抢占方式（Preempt=YES）