1. 配置IP地址
[LSW1-GigabitEthernet0/0/2]ip add 10.1.1.1 24
[LSW1-LoopBack0]ip add 1.1.1.1 32
[LSW2-GigabitEthernet0/0/1]ip add 10.1.1.2 24
[LSW2-GigabitEthernet0/0/0]ip add 10.1.2.2 24
[LSR2-LoopBack0]ip add 2.2.2.2 32
[LSW3-GigabitEthernet0/0/2]ip add 10.1.2.3 24
[LSW3-GigabitEthernet0/0/0]ip add 10.1.3.3 24
[LSR3-LoopBack0]ip add 3.3.3.3 32
[LSR4-GigabitEthernet0/0/0]ip add 10.1.3.4 24
[LSR4-LoopBack0]ip add 4.4.4.4 32
2. 配置骨干网设备的IS-IS协议的基本功能，并引入静态路由
[LSW2]isis 1
[LSW2-isis-1]network-entity 10.0000.0000.0001.00
[LSW2-isis-1]import-route static
[LSW2-GigabitEthernet0/0/1]isis enable 1
[LSW2-GigabitEthernet0/0/0]isis enable 1
[LSW2-LoopBack0]isis enable 1
[LSW3]isis 1
[LSW3-isis-1]network-entity 10.0000.0000.0002.00
[LSW3-isis-1]import-route static
[LSW3-GigabitEthernet0/0/2]isis enable 1
[LSW3-GigabitEthernet0/0/0]isis enable 1
[LSW3-LoopBack0]isis enable 1
3. 配置静态路由，减少不必要的IP表项
[LSR1]ip route-static 0.0.0.0 0.0.0.0 10.1.1.2
[LSR2]ip route-static 1.1.1.1 255.255.255.255 10.1.1.1
[LSR3]ip route-static 4.4.4.4 255.255.255.255 10.1.3.4
[LSR4]ip route-static 0.0.0.0 0.0.0.0 10.1.3.3
4. 使能各节点全局和接口的MPLS和MPLS LDP能力
[LSW1]mpls lsr-id 1.1.1.1
[LSW1]mpls
[LSW1]mpls ldp
[LSW1-GigabitEthernet0/0/2]mpls
[LSW1-GigabitEthernet0/0/2]mpls ldp
[LSW2]mpls lsr-id 2.2.2.2
[LSW2]mpls
[LSW2]mpls ldp
[LSW2-GigabitEthernet0/0/1]mpls
[LSW2-GigabitEthernet0/0/1]mpls ldp
[LSW2-GigabitEthernet0/0/0]mpls
[LSW2-GigabitEthernet0/0/0]mpls ldp
[LSW3]mpls lsr-id 3.3.3.3
[LSW3]mpls
[LSW3]mpls ldp
[LSW3-GigabitEthernet0/0/2]mpls
[LSW3-GigabitEthernet0/0/2]mpls ldp
[LSW3-GigabitEthernet0/0/0]mpls
[LSW3-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
5. 配置DoD的标签发布方式，减少不必要的MPLS表项
[LSW1-GigabitEthernet0/0/2]mpls ldp advertisement dod
[LSW2-GigabitEthernet0/0/1]mpls ldp advertisement dod
[LSW3-GigabitEthernet0/0/0]mpls ldp advertisement dod
[LSR4-GigabitEthernet0/0/0]mpls ldp advertisement dod
6. 配置LDP跨域扩展
[LSW1]mpls ldp
[LSW1-mpls-ldp]longest-match //使能LDP按照最长匹配方式查找路由建立LSP
[LSR4]mpls ldp
[LSR4-mpls-ldp]longest-match
7. 配置LDP远端会话，并使能LDP自动触发DoD请求功能，实现建立LDP LSP
[LSW1]mpls ldp remote-peer lsr4
[LSW1-mpls-ldp-remote-lsr4]remote-ip 4.4.4.4
[LSW1-mpls-ldp-remote-lsr4]remote-ip auto-dod-request
[LSR4]mpls ldp remote-peer lsr1
[LSR4-mpls-ldp-remote-lsr1]remote-ip 1.1.1.1
[LSR4-mpls-ldp-remote-lsr1]remote-ip auto-dod-request
8. 检查配置
