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配置VRRP+MSTP，使得PC1和PC2通信始终通过最优路径

基础配置（VLAN+IP）

LSW1

#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 8 to 9
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 8 to 9
#
interface GigabitEthernet0/0/4
 port link-type access
#
interface Vlanif1
 ip address 12.1.1.1 255.255.255.0
#
interface Vlanif8
 ip address 192.168.1.1 255.255.255.0
#
interface Vlanif9
 ip address 192.168.2.1 255.255.255.0

LSW2

#
interface Vlanif1
 ip address 12.1.2.1 255.255.255.0
#
interface Vlanif8
 ip address 192.168.1.2 255.255.255.0
#
interface Vlanif9
 ip address 192.168.2.2 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 8 to 9
#
interface GigabitEthernet0/0/3
 port link-type trunk
 port trunk allow-pass vlan 8 to 9
#
interface GigabitEthernet0/0/4
 port link-type access

LSW3

#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 8 to 9
#
interface GigabitEthernet0/0/3
 port link-type trunk
 port trunk allow-pass vlan 8 to 9
#
interface GigabitEthernet0/0/4
 port link-type access
 port default vlan 8
#
interface GigabitEthernet0/0/5
 port link-type access
 port default vlan 9

AR2

#
interface GigabitEthernet0/0/0
 ip address 12.1.1.2 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 12.1.2.2 255.255.255.0
 #
interface LoopBack1
 ip address 8.8.8.8 255.255.255.255

路由配置

LSW1

[LSW1]ip route-static 0.0.0.0 0 12.1.1.2

LSW2

[LSW2]ip route-static 0.0.0.0 0 12.1.2.2

AR2

[AR2]ip route-static 192.168.1.0 24 12.1.1.1 preference 50
[AR2]ip route-static 192.168.1.0 24 12.1.2.1
[AR2]ip route-static 192.168.2.0 24 12.1.2.1 preference 50
[AR2]ip route-static 192.168.2.0 24 12.1.1.1

MSTP配置

LSW1

#
stp region-configuration
 region-name gls.com
 revision-level 1
 instance 1 vlan 8
 instance 2 vlan 9
 active region-configuration
#
stp instance 1 priority 0
stp instance 2 priority 4096

LSW2

#
stp region-configuration
 region-name gls.com
 revision-level 1
 instance 1 vlan 8
 instance 2 vlan 9
 active region-configuration
#
stp instance 1 priority 4096
stp instance 2 priority 0

LSW3

#
stp region-configuration
 region-name gls.com
 revision-level 1
 instance 1 vlan 8
 instance 2 vlan 9
 active region-configuration

MSTP配置认证

[LSW3]dis stp instance 1 brief
 MSTID  Port                        Role  STP State     Protection
   1    GigabitEthernet0/0/2        ROOT  FORWARDING      NONE
   1    GigabitEthernet0/0/3        ALTE  DISCARDING      NONE
   1    GigabitEthernet0/0/4        DESI  FORWARDING      NONE
[LSW3]dis stp instance 2 brief
 MSTID  Port                        Role  STP State     Protection
   2    GigabitEthernet0/0/2        ALTE  DISCARDING      NONE
   2    GigabitEthernet0/0/3        ROOT  FORWARDING      NONE
   2    GigabitEthernet0/0/5        DESI  FORWARDING      NONE

VRRP配置

LSW1

#
interface Vlanif8
 ip address 192.168.1.1 255.255.255.0
 vrrp vrid 1 virtual-ip 192.168.1.254
 vrrp vrid 1 priority 200
#
interface Vlanif9
 ip address 192.168.2.1 255.255.255.0
 vrrp vrid 2 virtual-ip 192.168.2.254

LSW2

#
interface Vlanif8
 ip address 192.168.1.2 255.255.255.0
 vrrp vrid 1 virtual-ip 192.168.1.254
#
interface Vlanif9
 ip address 192.168.2.2 255.255.255.0
 vrrp vrid 2 virtual-ip 192.168.2.254
 vrrp vrid 2 priority 200

VRRP配置验证

[LSW1]dis vrrp brief 
VRID  State        Interface                Type     Virtual IP     
----------------------------------------------------------------
1     Master       Vlanif8                  Normal   192.168.1.254  
2     Backup       Vlanif9                  Normal   192.168.2.254  
----------------------------------------------------------------
Total:2     Master:1     Backup:1     Non-active:0     
[LSW2]dis vrrp brief
VRID  State        Interface                Type     Virtual IP     
----------------------------------------------------------------
1     Backup       Vlanif8                  Normal   192.168.1.254  
2     Master       Vlanif9                  Normal   192.168.2.254  
----------------------------------------------------------------
Total:2     Master:1     Backup:1     Non-active:0

连通测试

PC1 ping AR2

PC>ping 8.8.8.8

Ping 8.8.8.8: 32 data bytes, Press Ctrl_C to break
From 8.8.8.8: bytes=32 seq=1 ttl=254 time=63 ms

--- 8.8.8.8 ping statistics ---
  1 packet(s) transmitted
  1 packet(s) received
  0.00% packet loss
  round-trip min/avg/max = 63/63/63 ms

路径

PC2 ping AR2

PC>ping 8.8.8.8

Ping 8.8.8.8: 32 data bytes, Press Ctrl_C to break
From 8.8.8.8: bytes=32 seq=1 ttl=254 time=141 ms

--- 8.8.8.8 ping statistics ---
  1 packet(s) transmitted
  1 packet(s) received
  0.00% packet loss
  round-trip min/avg/max = 141/141/141 ms

路径