MPLS和LDP基本配置

拓扑图

设备	接口	IP地址	子网掩码	默认网关
R1	G0/0/0	10.0.12.1	255.255.255.0	N/A
	Look 0	10.0.1.1	255.255.255.255	N/A
R2	G0/0/0	10.0.12.2	255.255.255.0
	G0/0/1	10.0.23.2	255.255.255.0	N/A
	Look 0	10.0.1.1	255.255.255.255	N/A
R3	G0/0/0	10.0.23.3	255.255.255.0	N/A
	Look	10.0.3.3	255.255.255.255	N/A

1.基本配置

R1:
sys
sysname R1
int loop 0
ip add 10.0.1.1 32
int g0/0/0
ip add 10.0.12.1 24
q

R2:
sys
sysname R2
int loop 0
ip add 10.0.2.2 32
int g0/0/0
ip add 10.0.12.2 24
int g0/0/1
ip add 10.0.23.2 24
q

R3:
sys
sysname R3
int loop 0
ip add 10.0.3.3 32
int g0/0/1
ip add 10.0.23.3 24
q

2.配置OSPF路由协议

R1
ospf router-id 10.0.1.1        //用look的ip地址作id名
area 0      //区域0
network 10.0.12.0 0.0.0.255    //宣告进OSPF
network 10.0.1.1 0.0.0.0       //0.0.0.0表示全匹配，0.0.0.255表示匹配后八位

R2
ospf router-id 10.0.2.2
area 0
network 10.0.12.0 0.0.0.255
network 10.0.2.2 0.0.0.0
network 10.0.23.0 0.0.0.255

R3
ospf router-id 10.0.3.3
area 0
network 10.0.23.0 0.0.0.255
network 10.0.3.3 0.0.0.0

3.配置MPLS协议

[R1]mpls lsr-id 10.0.1.1  //配置LSR ID
[R1]mpls          //全局中启动MPLS
Info: Mpls starting, please wait... OK!
[R1-mpls]int g0/0/0
[R1-GigabitEthernet0/0/0]mpls   //在要转发MPLS报文的接口上启动MPLS

R2
mpls lsr-id 10.0.2.2
mpls
int g0/0/0
mpls 
int g0/0/1
mpls

R3
mpls lsr-id 10.0.3.3
mpls
int g0/0/1
mpls

4.配置静态LSP
配置R1去R3的LSP

[R1]static-lsp ingress R1toR3 destination 10.0.3.3 32 nexthop 10.0.12.2 out-label 102   
//配置R1到R3的静态LSP的Ingress,分配标签

[R2]mpls lsr-id 10.0.2.2
[R2]mpls
Info: Mpls starting, please wait... OK!
[R2-mpls]int g0/0/0
[R2-GigabitEthernet0/0/0]mpls
[R2-GigabitEthernet0/0/0]int g0/0/1
[R2-GigabitEthernet0/0/1]mpls
[R2]static-lsp transit R1toR3 incoming-interface GigabitEthernet 0/0/0 in-label 102 nexthop 10.0.23.3 out-label 203
//配置R1到R3的静态LSP的Transit,分配标签

[R3]mpls lsr-id 10.0.2.2
[R3]mpls
[R3-mpls]int g0/0/1
[R3-GigabitEthernet0/0/1]mpls 
[R3]static-lsp egress R1toR3 incoming-interface GigabitEthernet 0/0/1 in-label 203
//配置R1到R3的静态LSP的Egress,分配标签

验证



验证去往10.0.3.3 32的MPLS报文经过的路径


LSP具有单向性

配置R3去R1的LSP

[R3]static-lsp ingress R3toR1 destination 10.0.1.1 32 nexthop 10.0.23.2 out-label 101

[R2]static-lsp transit R3toR1 incoming-interface GigabitEthernet 0/0/1 in-label 101 nexthop 10.0.12.1 out-label 201

[R1]static-lsp egress R3toR1 incoming-interface GigabitEthernet 0/0/0 in-label 201

验证

5.利用LDP动态分发标签并建立LSP

[R1]undo static-lsp ingress R1toR3  //删除之前的静态LSP
[R1]undo static-lsp egress R3toR1

[R2]undo static-lsp transit R1toR3
[R2]undo static-lsp transit R3toR1

[R3]undo static-lsp egress R1toR3
[R3]undo static-lsp ingress R3toR1

[R1]mpls ldp          //全局启动LDP
[R1-mpls-ldp]int g0/0/0        
[R1-GigabitEthernet0/0/0]mpls ldp    //接口上启动LDP

[R2]mpls ldp          //全局启动LDP
[R2-mpls-ldp]int g0/0/0        
[R2-GigabitEthernet0/0/0]mpls ldp   //接口上启动LDP
[R2-mpls-ldp]int g0/0/1        
[R2-GigabitEthernet0/0/1]mpls ldp   //接口上启动LDP

[R3]mpls ldp          //全局启动LDP
[R3-mpls-ldp]int g0/0/1       
[R3-GigabitEthernet0/0/1]mpls ldp    //接口上启动LDP
//要先配置MPLS才可以配置LDP

验证
查看LDP接口

g0/0/0接口启动了LDP，标签分发方式为DU方式

查看LDP会话信息



查看LSP信息

在R1上验证去往10.0.3.3/32的MPLS报文经过的路径

报文出发时标签是1025，经过R2后被替换成了3


实验结束