拓扑如下：
环境结构：
VRRP:
根据IP地址，交换机之间运行OSPF达到VLAN间通讯，使用LSW2作为VLAN10的VRRP的Master使用虚拟IP192.168.10.254，作为VLAN20的BackUp使用虚拟IP192.168.20.254。同理LSW3相反即可。配置端口跟踪达到故障切换的目的。
MSTP:
LSW1作为MSTP根桥设立实例对应相应VLAN，修改LSW2对VLAN10和VLAN20的优先级，修改LSW3对VLAN10和VLAN20的优先级。使得VLAN10流量走LSW2交换机，VLAN20流量走LSW3交换机，达到负载均衡的目的。并给相应的PC配置上STP边缘接口，达到快速收敛的目的。
配置如下：
LSW1：
# vlan batch 10 20 30 # stp instance 0 root primary stp instance 1 root primary stp instance 2 root primary stp instance 3 root primary # region-configuration region-name Test revision-level 1 instance 1 vlan 10 instance 2 vlan 20 instance 3 vlan 30 active region-configuration # interface Vlanif10 ip address 192.168.10.251 255.255.255.0 # interface Vlanif20 ip address 192.168.20.251 255.255.255.0 # interface Vlanif30 ip address 192.168.30.254 255.255.255.0 # interface GigabitEthernet0/0/1 port link-type access port default vlan 30 stp edged-port enable # interface GigabitEthernet0/0/23 port link-type trunk port trunk allow-pass vlan 10 20 30 # interface GigabitEthernet0/0/24 port link-type trunk port trunk allow-pass vlan 10 20 30 # ospf 1 area 0.0.0.0 network 192.168.10.0 0.0.0.255 network 192.168.20.0 0.0.0.255 network 192.168.30.0 0.0.0.255 #
LSW2:
# vlan batch 10 20 30 # stp instance 1 priority 4096 stp instance 2 priority 8192 # stp region-configuration region-name Test revision-level 1 instance 1 vlan 10 instance 2 vlan 20 instance 3 vlan 30 active region-configuration # interface Vlanif10 ip address 192.168.10.252 255.255.255.0 vrrp vrid 1 virtual-ip 192.168.10.254 vrrp vrid 1 priority 120 vrrp vrid 1 track interface GigabitEthernet0/0/24 reduced 15 vrrp vrid 1 track interface GigabitEthernet0/0/22 reduced 15 # interface Vlanif20 ip address 192.168.20.252 255.255.255.0 vrrp vrid 1 virtual-ip 192.168.20.254 # interface GigabitEthernet0/0/22 port link-type trunk port trunk allow-pass vlan 2 to 4094 # interface GigabitEthernet0/0/23 port link-type trunk port trunk allow-pass vlan 2 to 4094 # interface GigabitEthernet0/0/24 port link-type trunk port trunk allow-pass vlan 2 to 4094 # ospf 1 area 0.0.0.0 network 192.168.10.0 0.0.0.255 network 192.168.20.0 0.0.0.255 network 192.168.30.0 0.0.0.255 # return
LSW3:
# vlan batch 10 20 30 # stp instance 1 priority 8192 stp instance 2 priority 4096 # stp region-configuration region-name Test revision-level 1 instance 1 vlan 10 instance 2 vlan 20 instance 3 vlan 30 active region-configuration # interface Vlanif10 ip address 192.168.10.253 255.255.255.0 vrrp vrid 1 virtual-ip 192.168.10.254 # interface Vlanif20 ip address 192.168.20.253 255.255.255.0 vrrp vrid 1 virtual-ip 192.168.20.254 vrrp vrid 1 priority 120 vrrp vrid 1 track interface GigabitEthernet0/0/24 reduced 15 vrrp vrid 1 track interface GigabitEthernet0/0/22 reduced 15 # interface GigabitEthernet0/0/22 port link-type trunk port trunk allow-pass vlan 10 20 30 # interface GigabitEthernet0/0/23 port link-type trunk port trunk allow-pass vlan 10 20 30 # interface GigabitEthernet0/0/24 port link-type trunk port trunk allow-pass vlan 10 20 30 # ospf 1 area 0.0.0.0 network 192.168.10.0 0.0.0.255 network 192.168.20.0 0.0.0.255 network 192.168.30.0 0.0.0.255 # user-interface con 0 user-interface vty 0 4 #
LSW4:
# vlan batch 10 20 30 # stp region-configuration region-name Test revision-level 1 instance 1 vlan 10 instance 2 vlan 20 instance 3 vlan 30 active region-configuration # interface GigabitEthernet0/0/1 port link-type access port default vlan 10 stp edged-port enable # interface GigabitEthernet0/0/2 port link-type access port default vlan 20 stp edged-port enable # interface GigabitEthernet0/0/23 port link-type trunk port trunk allow-pass vlan 10 20 30 # interface GigabitEthernet0/0/24 port link-type trunk port trunk allow-pass vlan 10 20 30 # return
验证：在LSW2、LSW3上使用disp vrrp brief可以查看不同vlan对应不同交换机。在LSW4上disp stp brief 可以查看不同实例对应的根端口，分别关闭LSW2 gi0/0/24和gi0/0/22后vrrp端口跟踪生效，可以进行Master和Backup切换，并且MSTP可以快速收敛。并且PC1-PC3对应端口不参加STP运算。