1. 配置IP地址
[LSR1-GigabitEthernet0/0/0]ip add 20.1.1.1 24
[LSR1-LoopBack0]ip add 1.1.1.1 32
[LSR2-GigabitEthernet0/0/0]ip add 20.1.1.2 24
[LSR2-GigabitEthernet0/0/1]ip add 20.1.2.2 24
[LSR2-GigabitEthernet0/0/2]ip add 20.1.4.2 24
[LSR2-LoopBack0]ip add 2.2.2.2 32
[LSR3-GigabitEthernet0/0/0]ip add 20.1.2.3 24
[LSR3-GigabitEthernet0/0/1]ip add 20.1.3.3 24
[LSR3-GigabitEthernet0/0/2]ip add 20.1.5.3 24
[LSR3-LoopBack0]ip add 3.3.3.3 32
[LSR4-GigabitEthernet0/0/0]ip add 20.1.3.4 24
[LSR4-LoopBack0]ip add 4.4.4.4 32
[LSR5-GigabitEthernet0/0/0]ip add 20.1.4.5 24
[LSR5-GigabitEthernet0/0/1]ip add 20.1.5.5 24
[LSR5-LoopBack0]ip add 5.5.5.5 32
2. 配置IS-IS协议发布路由
[LSR1]isis 1
[LSR1-isis-1]network-entity 00.0001.0000.0000.0001.00
[LSR1-isis-1]is-level level-2
[LSR1-GigabitEthernet0/0/0]isis enable 1
[LSR1-LoopBack0]isis enable 1
[LSR2]isis 1
[LSR2-isis-1]network-entity 00.0001.0000.0000.0002.00
[LSR2-isis-1]is-level level-2
[LSR2-GigabitEthernet0/0/0]isis enable 1
[LSR2-GigabitEthernet0/0/1]isis enable 1
[LSR2-GigabitEthernet0/0/2]isis enable 1
[LSR2-LoopBack0]isis enable 1
[LSR3]isis 1
[LSR3-isis-1]network-entity 00.0001.0000.0000.0003.00
[LSR3-isis-1]is-level level-2
[LSR3-GigabitEthernet0/0/0]isis enable 1
[LSR3-GigabitEthernet0/0/1]isis enable 1
[LSR3-GigabitEthernet0/0/2]isis enable 1
[LSR3-LoopBack0]isis enable 1
[LSR4]isis 1
[LSR4-isis-1]network-entity 00.0001.0000.0000.0004.00
[LSR4-isis-1]is-level level-2
[LSR4-GigabitEthernet0/0/0]isis enable 1
[LSR4-LoopBack0]isis enable 1
[LSR5]isis 1
[LSR5-isis-1]network-entity 00.0001.0000.0000.0005.00
[LSR5-isis-1]is-level level-2
[LSR5-GigabitEthernet0/0/0]isis enable 1
[LSR5-GigabitEthernet0/0/1]isis enable 1
[LSR5-LoopBack0]isis enable 1
3. 配置MPLS基本能力，使能MPLS TE、RSVP-TE和CSPF，需在主隧道的入节点和旁路隧道入节点上使能CSPF
[LSR1]mpls lsr-id 1.1.1.1
[LSR1]mpls
[LSR1-mpls]mpls te
[LSR1-mpls]mpls te cspf
[LSR1-mpls]mpls rsvp-te
[LSR1-GigabitEthernet0/0/0]mpls
[LSR1-GigabitEthernet0/0/0]mpls te
[LSR1-GigabitEthernet0/0/0]mpls rsvp-te
[LSR1]isis
[LSR1-isis-1]cost-style wide
[LSR1-isis-1]traffic-eng level-2
[LSR2]mpls lsr-id 2.2.2.2
[LSR2]mpls
[LSR2-mpls]mpls te
[LSR2-mpls]mpls rsvp-te
[LSR2-mpls]mpls te cspf
[LSR2-GigabitEthernet0/0/0]mpls
[LSR2-GigabitEthernet0/0/0]mpls te
[LSR2-GigabitEthernet0/0/0]mpls rsvp-te
[LSR2-GigabitEthernet0/0/1]mpls
[LSR2-GigabitEthernet0/0/1]mpls te
[LSR2-GigabitEthernet0/0/1]mpls rsvp-te
[LSR2-GigabitEthernet0/0/2]mpls
[LSR2-GigabitEthernet0/0/2]mpls te
[LSR2-GigabitEthernet0/0/2]mpls rsvp-te
[LSR2]isis
[LSR2-isis-1]cost-style wide
[LSR2-isis-1]traffic-eng level-2
[LSR3]mpls lsr-id 3.3.3.3
[LSR3]mpls
[LSR3-mpls]mpls te
[LSR3-mpls]mpls rsvp-te
[LSR3-GigabitEthernet0/0/0]mpls
[LSR3-GigabitEthernet0/0/0]mpls te
[LSR3-GigabitEthernet0/0/0]mpls rsvp-te
[LSR3-GigabitEthernet0/0/1]mpls
[LSR3-GigabitEthernet0/0/1]mpls te
[LSR3-GigabitEthernet0/0/1]mpls rsvp-te
[LSR3-GigabitEthernet0/0/2]mpls
[LSR3-GigabitEthernet0/0/2]mpls te
[LSR3-GigabitEthernet0/0/2]mpls rsvp-te
[LSR3]isis
[LSR3-isis-1]cost-style wide
[LSR3-isis-1]traffic-eng level-2
[LSR4]mpls lsr-id 4.4.4.4
[LSR4]mpls
[LSR4-mpls]mpls te
[LSR4-mpls]mpls rsvp-te
[LSR4-GigabitEthernet0/0/0]mpls
[LSR4-GigabitEthernet0/0/0]mpls te
[LSR4-GigabitEthernet0/0/0]mpls rsvp-te
[LSR4]isis
[LSR4-isis-1]cost-style wide
[LSR4-isis-1]traffic-eng level-2
[LSR5]mpls lsr-id 5.5.5.5
[LSR5]mpls
[LSR5-mpls]mpls te
[LSR5-mpls]mpls rsvp-te
[LSR5-GigabitEthernet0/0/0]mpls
[LSR5-GigabitEthernet0/0/0]mpls te
[LSR5-GigabitEthernet0/0/0]mpls rsvp-te
[LSR5-GigabitEthernet0/0/1]mpls
[LSR5-GigabitEthernet0/0/1]mpls te
[LSR5-GigabitEthernet0/0/1]mpls rsvp-te
[LSR5]isis
[LSR5-isis-1]cost-style wide
[LSR5-isis-1]traffic-eng level-2
4. 在入节点LSRA上创建主CR-LSP的MPLS TE Tunnel
[LSR1]explicit-path pp1 //配置主CR-LSP的显式路径
[LSR1-explicit-path-pp1]next hop 20.1.1.2
[LSR1-explicit-path-pp1]next hop 20.1.2.3
[LSR1-explicit-path-pp1]next hop 20.1.3.4
[LSR1-explicit-path-pp1]next hop 4.4.4.4
[LSR1]int Tunnel 0/0/1 //配置主CR-LSP的MPLS TE隧道接口
[LSR1-Tunnel0/0/1]ip add unnumbered interface LoopBack 0
[LSR1-Tunnel0/0/1]tunnel-protocol mpls te
[LSR1-Tunnel0/0/1]destination 4.4.4.4
[LSR1-Tunnel0/0/1]mpls te tunnel-id 100
[LSR1-Tunnel0/0/1]mpls te path explicit-path pp1
[LSR1-Tunnel0/0/1]mpls te fast-reroute //使能TE FRR
[LSR1-Tunnel0/0/1]mpls te commit
5. 在作为PLR的LSR2上配置Bypass CR-LSP
[LSR2]explicit-path bp1 //配置Bypass CR-LSP的显式路径
[LSR2-explicit-path-bp1]next hop 20.1.4.5
[LSR2-explicit-path-bp1]next hop 20.1.5.3
[LSR2-explicit-path-bp1]next hop 3.3.3.3
[LSR2]int Tunnel 0/0/2 //配置Bypass CR-LSP的隧道接口
[LSR2-Tunnel0/0/2]ip add unnumbered interface LoopBack 0
[LSR2-Tunnel0/0/2]tunnel-protocol mpls te
[LSR2-Tunnel0/0/2]destination 3.3.3.3
[LSR2-Tunnel0/0/2]mpls te tunnel-id 101
[LSR2-Tunnel0/0/2]mpls te path explicit-path bp1
[LSR2-Tunnel0/0/2]mpls te bypass-attributes
[LSR2-Tunnel0/0/2]mpls te protected-interface g0/0/1 //将Bypass CR-LSP绑定到被保护的接口
[LSR2-Tunnel0/0/2]mpls te commit
6. 在LSR2与LSR3上配置RSVP摘要刷新功能
[LSR2]mpls
[LSR2-mpls]mpls rsvp-te srefresh
[LSR3]mpls
[LSR3-mpls]mpls rsvp-te srefresh
7. 检查配置
使PLR上被保护的出接口失效
[LSR2-GigabitEthernet0/0/1]shutdown
可以确认链路已切换到Bypass CR-LSP
