配置各接口所属VLAN
[LSW1]vlan batch 10 12 13
[LSW1-GigabitEthernet0/0/2]port link-type trunk
[LSW1-GigabitEthernet0/0/2]port trunk allow-pass vlan 12
[LSW1-GigabitEthernet0/0/3]port link-type trunk
[LSW1-GigabitEthernet0/0/3]port trunk allow-pass vlan 13
[LSW1-GigabitEthernet0/0/1]port link-type trunk
[LSW1-GigabitEthernet0/0/1]port trunk allow-pass vlan 10
[LSW2]vlan batch 12 23
[LSW2-GigabitEthernet0/0/1]port link-type trunk
[LSW2-GigabitEthernet0/0/1]port trunk allow-pass vlan 12
[LSW2-GigabitEthernet0/0/4]port link-type trunk
[LSW2-GigabitEthernet0/0/4]port trunk allow-pass vlan 23
[LSW3]vlan batch 13 34
[LSW3-GigabitEthernet0/0/1]port link-type trunk
[LSW3-GigabitEthernet0/0/1]port trunk allow-pass vlan 13
[LSW3-GigabitEthernet0/0/4]port link-type trunk
[LSW3-GigabitEthernet0/0/4]port trunk allow-pass vlan 34
[LSW4]vlan batch 23 34
[LSW4-GigabitEthernet0/0/2]port link-type trunk
[LSW4-GigabitEthernet0/0/2]port trunk allow-pass vlan 23
[LSW4-GigabitEthernet0/0/3]port link-type trunk
[LSW4-GigabitEthernet0/0/3]port trunk allow-pass vlan 34
[LSW4-GigabitEthernet0/0/1]port link-type trunk
[LSW4-GigabitEthernet0/0/1]port trunk allow-pass vlan 20
配置各接口的IP地址
[LSW1-Vlanif12]ip add 10.1.12.1 24
[LSW1-Vlanif13]ip add 10.1.13.1 24
[LSW1-Vlanif10]ip add 10.1.10.1 24
[LSW2-Vlanif12]ip add 10.1.12.2 24
[LSW2-Vlanif23]ip add 10.1.23.2 24
[LSW3-Vlanif13]ip add 10.1.13.3 24
[LSW3-Vlanif34]ip add 10.1.34.3 24
[LSW4-Vlanif23]ip add 10.1.23.4 24
[LSW4-Vlanif34]ip add 10.1.34.4 24
[LSW4-Vlanif20]ip add 10.1.20.4 24
[LSW1]int LoopBack 0
[LSW1-LoopBack0]ip add 10.1.1.1 32
[LSW2]int LoopBack 0
[LSW2-LoopBack0]ip add 10.2.2.2 32
[LSW3]int LoopBack 0
[LSW3-LoopBack0]ip add 10.3.3.3 32
[LSW4]int LoopBack 0
[LSW4-LoopBack0]ip add 10.4.4.4 32
配置OSPF基本功能
[LSW1]ospf 1 router-id 10.1.1.1
[LSW1-ospf-1]area 0
[LSW1-ospf-1-area-0.0.0.0]network 10.1.10.0 0.0.0.255
[LSW1-ospf-1-area-0.0.0.0]network 10.1.12.0 0.0.0.255
[LSW1-ospf-1-area-0.0.0.0]network 10.1.13.0 0.0.0.255
[LSW2]ospf 1 router-id 10.2.2.2
[LSW2-ospf-1]area 0
[LSW2-ospf-1-area-0.0.0.0]network 10.1.12.0 0.0.0.255
[LSW2-ospf-1-area-0.0.0.0]network 10.1.23.0 0.0.0.255
[LSW3]ospf 1 router-id 10.3.3.3
[LSW3-ospf-1]area 0
[LSW3-ospf-1-area-0.0.0.0]network 10.1.13.0 0.0.0.255
[LSW3-ospf-1-area-0.0.0.0]network 10.1.34.0 0.0.0.255
[LSW4]ospf 1 router-id 10.4.4.4
[LSW4-ospf-1]area 0
[LSW4-ospf-1-area-0.0.0.0]network 10.1.23.0 0.0.0.255
[LSW4-ospf-1-area-0.0.0.0]network 10.1.34.0 0.0.0.255
[LSW4-ospf-1-area-0.0.0.0]network 10.1.20.0 0.0.0.255
可以看到去往10.1.20.0网段的两个下一跳10.1.12.2和10.1.13.3均成为有效路由，形成负载分担
在LSW1上配置等价路由优先级
[LSW1-ospf-1]nexthop 10.1.12.2 weight 1
可以看出，当配置等价路由的优先级后，由于下一跳为10.1.12.2的优先级（权值为1）高于下一跳为10.1.13.3的优先级，所以OSPF优先选择下一跳为10.1.12.2为唯一最优路由
