1. 配置IP地址
[LSR1-GigabitEthernet0/0/0]ip add 10.1.1.1 24
[LSR1-LoopBack0]ip add 1.1.1.1 32
[LSR2-GigabitEthernet0/0/0]ip add 20.1.1.2 24
[LSR2-LoopBack0]ip add 2.2.2.2 32
[LSR3-GigabitEthernet0/0/0]ip add 20.1.2.3 24
[LSR3-LoopBack0]ip add 3.3.3.3 32
[LSR4-GigabitEthernet0/0/0]ip add 10.1.1.4 24
[LSR4-GigabitEthernet0/0/1]ip add 20.1.1.4 24
[LSR4-GigabitEthernet0/0/2]ip add 20.1.2.4 24
[LSR4-LoopBack0]ip add 4.4.4.4 32
2. 配置IS-IS协议的基本功能
[LSR1]isis 1
[LSR1-isis-1]is-level level-2
[LSR1-isis-1]network-entity 10.0010.0100.0001.00
[LSR1-GigabitEthernet0/0/0]isis enable 1
[LSR1-LoopBack0]isis enable 1
[LSR2]isis 1
[LSR2-isis-1]is-level level-1
[LSR2-isis-1]network-entity 20.0010.0100.0002.00
[LSR2-GigabitEthernet0/0/0]isis enable 1
[LSR2-LoopBack0]isis enable 1
[LSR3]isis 1
[LSR3-isis-1]is-level level-1
[LSR3-isis-1]network-entity 20.0010.0200.0003.00
[LSR3-GigabitEthernet0/0/0]isis enable 1
[LSR3-LoopBack0]isis enable 1
[LSR4]isis 1
[LSR4-isis-1]network-entity 20.0010.0300.0004.00
[LSR4-GigabitEthernet0/0/0]isis enable 1
[LSR4-GigabitEthernet0/0/0]isis circuit-level level-2
[LSR4-GigabitEthernet0/0/1]isis enable 1
[LSR4-GigabitEthernet0/0/1]isis circuit-level level-1
[LSR4-GigabitEthernet0/0/2]isis enable 1
[LSR4-GigabitEthernet0/0/2]isis circuit-level level-1
[LSR4-LoopBack0]isis enable 1
3. 配置聚合路由的策略
[LSR4]isis 1
[LSR4-isis-1]summary 20.1.0.0 255.255.0.0 avoid-feedback
4. 配置各节点全局和接口的MPLS和MPLS LDP能力，使网络能够转发MPLS流量，并查看LSP建立情况
[LSR1]mpls lsr-id 1.1.1.1
[LSR1]mpls
[LSR1]mpls ldp
[LSR1-GigabitEthernet0/0/0]mpls
[LSR1-GigabitEthernet0/0/0]mpls ldp
[LSR2]mpls lsr-id 2.2.2.2
[LSR2]mpls
[LSR2]mpls ldp
[LSR2-GigabitEthernet0/0/0]mpls
[LSR2-GigabitEthernet0/0/0]mpls ldp
[LSR3]mpls lsr-id 3.3.3.3
[LSR3]mpls
[LSR3]mpls ldp
[LSR3-GigabitEthernet0/0/0]mpls
[LSR3-GigabitEthernet0/0/0]mpls ldp
[LSR4]mpls lsr-id 4.4.4.4
[LSR4]mpls
[LSR4]mpls ldp
[LSR4-GigabitEthernet0/0/0]mpls
[LSR4-GigabitEthernet0/0/0]mpls ldp
[LSR4-GigabitEthernet0/0/1]mpls
[LSR4-GigabitEthernet0/0/1]mpls ldp
[LSR4-GigabitEthernet0/0/2]mpls
[LSR4-GigabitEthernet0/0/2]mpls ldp
5. 配置LDP跨域扩展
[LSR1]mpls ldp
[LSR1-mpls-ldp]longest-match
6. 检查配置
