vrrp+mstp实现链路高可用

架构

实现 ：1、全链路正常时，vlan 20走SW2出去，vlan 10 走SW1出去，链路故障后，实现vlan10,vlan20访问不受影响，实现高可用

vlan10  

     192.168.10.0/25 

     网关 192.168.10.1     

vlan  20 

    192.168.20.0 /25 

    网关    192.168.20.1

AR1

10.1.1.1/30

AR2 

10.2.2.1/30  

前提

配置全链路互通

思路 

    要想实现网关高可用，网关就得交给vrrp管理，实现故障时网关转移

   mstp的多实例可以实现指定实例的优先级调整，可以改变数据的走向

所有交换机的3口和2口做如下配置  打trunk 

vlan batch 10 20

  port-group 1

  group-member gi0/03 gi0/0/2

  group-member gi0/0/3 gi0/0/2

  port link-t tr

  port trunk allow-pass vlan 10 20

 retu 

 sys  

SW3 

port-group 2

  group-member gi0/0/3 gi0/0/4

  port link-t acc

  port default  vlan 10

  port default vlan 10

  return 

   sys  

port-group 3

  group-member gi0/0/5 gi0/0/6 

  port link-t acc

  port default  vlan 20

  port default vlan 20 

  retu

  sys 

vrrp配置  vlan 10

SW1

interface Vlanif10

ip address 192.168.10.126 255.255.255.128  #vrrp组播地址 

vrrp vrid 1 virtual-ip 192.168.10.1 #网关地址 

vrrp vrid 1 priority 105 

vrrp vrid 1 track interface GigabitEthernet0/0/2 reduced 20 #追踪接口2，如果该接口down优先级减少20 

vrrp vrid 1 track interface GigabitEthernet0/0/3 reduced 30 #追踪接口3，如果该接口down优先级减少30 

vrrp vrid 1 track interface GigabitEthernet0/0/1 reduced 30

SW2

interface Vlanif10

ip address 192.168.10.125 255.255.255.128 #vrrp组播地址 

vrrp vrid 1 virtual-ip 192.168.10.1

vrrp vrid 1 track interface GigabitEthernet0/0/2 reduced 20

vrrp vrid 1 track interface GigabitEthernet0/0/3 reduced 30

vrrp vrid 1 track interface GigabitEthernet0/0/1 reduced 30

vlan 20 

SW1
interface Vlanif20

ip address 192.168.20.125 255.255.255.128 

vrrp vrid 1 virtual-ip 192.168.20.1

vrrp vrid 1 track interface GigabitEthernet0/0/2 reduced 20

vrrp vrid 1 track interface GigabitEthernet0/0/3 reduced 30

vrrp vrid 1 track interface GigabitEthernet0/0/1 reduced 30 

SW2

interface Vlanif20

ip address 192.168.20.126 255.255.255.128  

vrrp vrid 1 virtual-ip 192.168.20.1 

vrrp vrid 1 priority 105 

vrrp vrid 1 track interface GigabitEthernet0/0/2 reduced 20

vrrp vrid 1 track interface GigabitEthernet0/0/3 reduced 30 

vrrp vrid 1 track interface GigabitEthernet0/0/1 reduced 30 

配置完成后，在传统的stp中，vlan 10走的路径最优，则环路中必阻断SW2与SW3之间的口，此时vlan20的传输路径同vlan10一致，所以需要用到mstp技术，将vlan20的数据路径修改

三台交换机都要配置，内容如下

 stp region-configuration  

instance  2 vlan 20  

region-name vlan_20 

active region-configuration

需要该哪个为根桥，就在哪台交换机修改，在vlan20中，想让sw2为根桥，则在sw2修改如下

[Huawei] stp instance 2 root primary

全链路随便故障，只要有一条能到路由器，链路就正常

不懂得留言，看到会回的啊~