关于mpls 私网标签/内层标签？

Posted 2023-04-23

最后一跳pe接受到的是已经弹出mpls公网标签的数据包，属于哪一个实例已经通过RT解决，但是还有mp-bgp的私网标签，私网标签作用是什么

参考技术A 私网标签是路由器分配给虚拟路由条目的标签，跟外层标签作用是一样的。本回答被提问者采纳

MPLS 单域

拓扑

配置思路：
1.公网igp保证公网设备环回口可达（ospf isis 等路由协议都可以）
2.部署mpls ldp标签纷发协议
3.两端公网设备R2和R5建立ibgp邻居关系（vpnv4地址族）
4.划分vpn实例
5.连接私网的设备和接口绑定vpn实例
6.配置连接用户侧的路由协议，注意如果和公网是相同的协议，要在不同进程
7.路由相互引入
地址配置忽略
公网IGP
R2

[H3C]ospf 1
[H3C-ospf-1]area 0
[H3C-ospf-1-area-0.0.0.0]network 202.1.34.1 0.0.0.0
[H3C-ospf-1-area-0.0.0.0]network  1.1.1.1 0.0.0.0

R4

[H3C]ospf 1
[H3C-ospf-1]area 0
[H3C-ospf-1-area-0.0.0.0]network  2.2.2.2 0.0.0.0
[H3C-ospf-1-area-0.0.0.0]network  202.1.34.2 0.0.0.0
[H3C-ospf-1-area-0.0.0.0]network  202.1.45.1 0.0.0.0

R5

[H3C]ospf 1
[H3C-ospf-1]area 0
[H3C-ospf-1-area-0.0.0.0]network  3.3.3.3 0.0.0.0
[H3C-ospf-1-area-0.0.0.0]network  202.1.45.2  0.0.0.0

配置mpls以及ldp
R2

[H3C]mpls lsr-id 1.1.1.1  #mpls配置
[H3C]mpls  ldp   #全局开启ldp
[H3C-ldp]qu
[H3C]interface g0/0 
[H3C-GigabitEthernet0/0]mpls enable
[H3C-GigabitEthernet0/0]mpls ldp enable   #接口开启ldp

R4

[H3C]mpls lsr-id 2.2.2.2
[H3C]mpls ldp
[H3C-ldp]qu
[H3C]interface range g0/0 g0/1
[H3C-if-range]mpls enable
[H3C-if-range]mpls ldp  enable

R5

[H3C]mpls  lsr-id  3.3.3.3
[H3C]in
[H3C]interface g0/1
[H3C-GigabitEthernet0/1mpls enable
[H3C-GigabitEthernet0/1]mpls  ldp  enable

R2与R5建立bgp vpnv4邻居关系
R2

[H3C]bgp 100
[H3C-bgp-default]router-id 1.1.1.1
[H3C-bgp-default]peer 3.3.3.3 as-number 100
[H3C-bgp-default]peer 3.3.3.3 connect-interface LoopBack  0
[H3C-bgp-default]address-family  vpnv4
[H3C-bgp-default-ipv4]peer  3.3.3.3 enable

R5

[H3C]bgp 100
[H3C-bgp-default]router-id 3.3.3.3
[H3C-bgp-default]peer  1.1.1.1 as-number  100
[H3C-bgp-default]peer 1.1.1.1 connect-interface LoopBack  0
[H3C-bgp-default]address-family  vpnv4
[H3C-bgp-default-ipv4]peer  1.1.1.1 enable

划分vpn实例并绑定
R2

[H3C]ip vpn-instance 1
[H3C-vpn-instance-1]route-distinguisher 1:1    #RD值		
[H3C-vpn-instance-1]vpn-target 1:1   #RT值
[H3C]interface g0/1
[H3C-GigabitEthernet0/1]ip binding  vpn-instance  1   #接口绑定vpn实例
Some configurations on the interface are removed.
[H3C-GigabitEthernet0/1]ip address 10.1.13.2 255.255.255.252
#绑定之后接口的配置会清空  要先保存接口的配置
[H3C]ip vpn-instance  2
[H3C-vpn-instance-2]route-distinguisher 2:2
[H3C-vpn-instance-2]vpn-target 2:2
[H3C-vpn-instance-2]in g0/2
[H3C-GigabitEthernet0/2]ip binding  vpn-instance  2
Some configurations on the interface are removed.
[H3C-GigabitEthernet0/2]ip address 10.1.23.2 255.255.255.252

R4

[H3C]ip vpn-instance 1
[H3C-vpn-instance-1] route-distinguisher 1:1
[H3C-vpn-instance-1] vpn-target 1:1 import-extcommunity
[H3C-vpn-instance-1] vpn-target 1:1 export-extcommunity
[H3C-vpn-instance-1]
[H3C-vpn-instance-1]qu
[H3C]ip vpn-instance 2
[H3C-vpn-instance-2] route-distinguisher 2:2
[H3C-vpn-instance-2] vpn-target 2:2 import-extcommunity
[H3C-vpn-instance-2] vpn-target 2:2 export-extcommunity

R5

[H3C]ip vpn-instance 1
[H3C-vpn-instance-1] route-distinguisher 1:1
[H3C-vpn-instance-1] vpn-target 1:1 import-extcommunity
[H3C-vpn-instance-1] vpn-target 1:1 export-extcommunity
[H3C-vpn-instance-1]ip vpn-instance 2
[H3C-vpn-instance-2] route-distinguisher 2:2
[H3C-vpn-instance-2] vpn-target 2:2 import-extcommunity
[H3C-vpn-instance-2] vpn-target 2:2 export-extcommunity
[H3C-vpn-instance-2]in g0/0
[H3C-GigabitEthernet0/0]dis th
[H3C-GigabitEthernet0/0]ip binding  vpn-instance  1
Some configurations on the interface are removed.
[H3C-GigabitEthernet0/0]ip address 10.1.56.2 255.255.255.252
[H3C-GigabitEthernet0/0]in g0/2
[H3C-GigabitEthernet0/2]ip binding  vpn-instance  2
Some configurations on the interface are removed.
[H3C-GigabitEthernet0/2]ip address 10.1.57.2 255.255.255.252

PE与CE之间路由协议
R1

[H3C]ospf 2
[H3C-ospf-2]area 0
[H3C-ospf-2-area-0.0.0.0]network  172.16.255.1 0.0.0.0
[H3C-ospf-2-area-0.0.0.0]network  10.1.13.1 0.0.0.0

R2

[H3C]ospf 2 vpn-instance  1
[H3C-ospf-2]area 0
[H3C-ospf-2-area-0.0.0.0]network  10.1.13.2 0.0.0.0

R6

[H3C]ospf 2
[H3C-ospf-2]area 0
[H3C-ospf-2-area-0.0.0.0]network  172.16.255.6 0.0.0.0
[H3C-ospf-2-area-0.0.0.0]network  10.1.56.1 0.0.0.0

R5

[H3C]ospf 2 vpn-instance  1
[H3C-ospf-2]area 0
[H3C-ospf-2-area-0.0.0.0]network  10.1.56.2 0.0.0.0

互相引入
R2

[H3C]ospf 2
[H3C-ospf-2]import-route bgp
[H3C]bgp 100
[H3C-bgp-default]ip vpn-instance  1      #进入实例
[H3C-bgp-default-1]address-family  ipv4   #与CE之间依然是普通的ipv4关系
[H3C-bgp-default-ipv4-1]import-route  ospf  2

R5

[H3C]ospf 2
[H3C-ospf-2]import-route  bgp
[H3C-ospf-2]qu
[H3C]bgp 100
[H3C-bgp-default]ip vpn-instance  1
[H3C-bgp-default-1]address-family  ipv4
[H3C-bgp-default-ipv4-1]import-route  ospf  2