拓扑
要求
一、MPLS静态配置，如图所示为MPLS域，AR1使用LSP-ping的方式访问AR5，且AR5回包方式也通过LSP方式，请抓包查看数据包的分装；
（1）请描述AR1访问AR5的MPLS数据访问过程？
（2）请问ingress设备如何区分MPLS转发还是IP转发？
配置
R1
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| <huawei>system-view
[huawei]sysname AR1
[AR1]mpls lsr-id 1.1.1.1 #必须先配置lsr-id，否则会告警
[AR1]mpls
[AR1]interface GigabitEthernet0/0/0
ip address 10.1.12.1 255.255.255.0
mpls #开启接口mpls功能
[AR1]interface LoopBack0
ip address 1.1.1.1 255.255.255.255
[AR1]ospf 1 #mpls需要路由支持
area 0.0.0.0
network 1.1.1.1 0.0.0.0
network 10.1.12.1 0.0.0.0
[AR1]static-lsp ingress 1t5 destination 5.5.5.5 32 nexthop 10.1.12.2 out-label 17
#静态+入标签（类型为源）+命名+目的地址（除非配置了，否则mpls默认只支持主机地址（32位））+下一跳（对端物理接口地址）+标签
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R2
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| <huawei>system-view
[huawei]sysname AR2
[AR2]mpls lsr-id 2.2.2.2 #必须先配置lsr-id，否则会告警
[AR2]mpls
[AR2]interface GigabitEthernet0/0/0
ip address 10.1.12.2 255.255.255.0
mpls
[AR2]interface GigabitEthernet0/0/1
ip address 10.1.23.2 255.255.255.0
mpls
[AR2]interface GigabitEthernet0/0/2
ip address 10.1.24.2 255.255.255.0
mpls
[AR2]ospf 1
area 0.0.0.0
network 10.1.12.2 0.0.0.0
network 10.1.23.2 0.0.0.0
network 10.1.24.2 0.0.0.0
[AR2]static-lsp transit 1t5 incoming-interface GigabitEthernet0/0/0 in-label 17 nexth
op 10.1.23.3 out-label 19 #静态 + 类型为转发 + 命名 + 标签来源接口（对端路由器接口） + 入方向标签 + 下一跳 + 出方向标签
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R3
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| <huawei>system-view
[huawei]sysname AR3
[AR3]mpls lsr-id 3.3.3.3
mpls
[AR3]interface GigabitEthernet0/0/0
ip address 10.1.23.3 255.255.255.0
mpls
interface GigabitEthernet0/0/1
ip address 10.1.34.3 255.255.255.0
mpls
[AR3]ospf 1
area 0.0.0.0
network 10.1.23.3 0.0.0.0
network 10.1.34.3 0.0.0.0
[AR3]static-lsp transit 1t5 incoming-interface GigabitEthernet0/0/1 in-label 19 nexthop 10.1.34.4 out-label 20
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R4
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| <huawei>system-view
[huawei]sysname AR4
[AR4]mpls lsr-id 4.4.4.4
mpls
[AR4]interface GigabitEthernet0/0/0
ip address 10.1.34.4 255.255.255.0
mpls
[AR4]interface GigabitEthernet0/0/1
ip address 10.1.45.4 255.255.255.0
mpls
[AR4]interface GigabitEthernet0/0/2
ip address 10.1.24.4 255.255.255.0
[AR4]static-lsp transit 1t5 incoming-interface GigabitEthernet0/0/1 in-label 20 nexthop 10.1.45.5 out-label 21
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R5
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| <huawei>system-view
[huawei]sysname AR5
[AR5]mpls lsr-id 5.5.5.5
mpls
[AR5]interface GigabitEthernet0/0/0
ip address 10.1.45.5 255.255.255.0
mpls
[AR5]interface LoopBack0
ip address 5.5.5.5 255.255.255.255
[AR5]ospf 1
area 0.0.0.0
network 5.5.5.5 0.0.0.0
network 10.1.45.5 0.0.0.0
[AR5]static-lsp egress 1t5 incoming-interface GigabitEthernet0/0/0 in-label 21
#静态 + 类型为目 + 命名 + 本端物理接口 + 入方向标签
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验证
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| 命令： ping lsp -a 1.1.1.1 ip 5.5.5.5 32
1.1.1.1可以ping通5.5.5.5，但是只能做到单方面的通信，要实现互通只要反过来来一遍就好，这时候5.5.5.5 就是源了。
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