1.配置IP地址
[LSR1]vlan batch 10 30
[LSR1-GigabitEthernet0/0/2]port link-type trunk
[LSR1-GigabitEthernet0/0/2]port trunk allow-pass vlan 10
[LSR1-GigabitEthernet0/0/3]port link-type trunk
[LSR1-GigabitEthernet0/0/3]port trunk allow-pass vlan 30
[LSR1-Vlanif10]ip add 10.1.1.1 24
[LSR1-Vlanif30]ip add 10.1.3.1 24
[LSR1-LoopBack0]ip add 1.1.1.1 32
[LSR2]vlan batch 10 20
[LSR2-GigabitEthernet0/0/1]port link-type trunk
[LSR2-GigabitEthernet0/0/1]port trunk allow-pass vlan 10
[LSR2-GigabitEthernet0/0/3]port link-type trunk
[LSR2-GigabitEthernet0/0/3]port trunk allow-pass vlan 20
[LSR2-Vlanif10]ip add 10.1.1.2 24
[LSR2-Vlanif20]ip add 10.1.2.2 24
[LSR2-LoopBack0]ip add 2.2.2.2 32
[LSR3]vlan batch 20
[LSR3-GigabitEthernet0/0/2]port link-type trunk
[LSR3-GigabitEthernet0/0/2]port trunk allow-pass vlan 20
[LSR3-GigabitEthernet0/0/3]port link-type trunk
[LSR3-GigabitEthernet0/0/3]port trunk allow-pass vlan 30
[LSR3-Vlanif20]ip add 10.1.2.3 24
[LSR3-Vlanif30]ip add 10.1.3.3 24
[LSR3-LoopBack0]ip add 3.3.3.3 32
2. 配置OSPF协议发布各节点接口所连网段和LSR ID的主机路由
[LSR1]ospf 1
[LSR1-ospf-1]area 0
[LSR1-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[LSR1-ospf-1-area-0.0.0.0]network 10.1.3.0 0.0.0.255
[LSR1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[LSR2]ospf 1
[LSR2-ospf-1]area 0
[LSR2-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[LSR2-ospf-1-area-0.0.0.0]network 10.1.2.0 0.0.0.255
[LSR2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[LSR3]ospf 1
[LSR3-ospf-1]area 0
[LSR3-ospf-1-area-0.0.0.0]network 10.1.2.0 0.0.0.255
[LSR3-ospf-1-area-0.0.0.0]network 10.1.3.0 0.0.0.255
[LSR3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
3. 在各LSR上使能全局MPLS和MPLS LDP
[LSR1]mpls lsr-id 1.1.1.1
[LSR1]mpls
[LSR1]mpls ldp
[LSR2]mpls lsr-id 2.2.2.2
[LSR2]mpls
[LSR2]mpls ldp
[LSR3]mpls lsr-id 3.3.3.3
[LSR3]mpls
[LSR3]mpls ldp
4. 在远端LDP会话两端LSR上指定远端对等体及IP地址
[LSR1]mpls ldp remote-peer LSW3
[LSR1-mpls-ldp-remote-lsw3]remote-ip 3.3.3.3
[LSR3]mpls ldp remote-peer LSR1
[LSR3-mpls-ldp-remote-lsr1]remote-ip 1.1.1.1
5. 在各LSR的接口上使能MPLS和MPLS LDP
[LSR1-Vlanif10]mpls
[LSR1-Vlanif10]mpls ldp
[LSR1-Vlanif30]mpls
[LSR1-Vlanif30]mpls ldp
[LSR2-Vlanif10]mpls
[LSR2-Vlanif10]mpls ldp
[LSR2-Vlanif20]mpls
[LSR2-Vlanif20]mpls ldp
[LSR3-Vlanif20]mpls
[LSR3-Vlanif20]mpls ldp
[LSR3-Vlanif30]mpls
[LSR3-Vlanif30]mpls ldp
6. 在各LSR上去使能STP
[LSR1]stp disable
[LSR2]stp disable
[LSR3]stp disable
7. 检查配置
[LSR1-GigabitEthernet0/0/3]shutdown //模拟LSR1和LSR3直连物理链路故障, LSR1和LSR3之间的本地邻接体进入Down状态，但二者通过LSR2路由仍可达
[LSR1-GigabitEthernet0/0/3]undo shutdown //LSR1和LSR3直连物理链路故障恢复后，链路切换回vlanif 30
