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一、MPLS V3PN跨域OptionA
1.配置思路
1）基础配置，并在公网环境中起IGP
2）在PE与ASBR-PE建立bgp-vpnv4关系
3）在PE设备创建vpn实例绑定接口，创建RT、RD
4）在PE上配置双向重分布
5）在公网环境中配置MPLS LDP
6）在ASBR-PE上创建虚拟子接口绑定vpn实例，配置RT、RD，同时配置ASBR之间的EBGP-vpn实例的邻居关系
（实际上ASBR-PE之间传递的是纯IP包）
2.配置
①首先实现内网的可达（配置IGP），，同时配置PE与ASBR-PE的vpnv4邻居关系
#
AR1
bgp 1undo default ipv4-unicastpeer 3.3.3.3 as-number 1 peer 3.3.3.3 connect-interface LoopBack1#ipv4-family unicastundo peer 3.3.3.3 enable# ipv4-family vpnv4policy vpn-targetpeer 3.3.3.3 enable
AR3
#
bgp 1peer 1.1.1.1 as-number 1 peer 1.1.1.1 connect-interface LoopBack1#ipv4-family unicastundo peer 1.1.1.1 enable# ipv4-family vpnv4policy vpn-targetpeer 1.1.1.1 enable②=============接着配置vpn实例（两个）=============
[R1]ip vpn-instance A
[R1-vpn-instance-A]route-distinguisher 1:1
[R1-vpn-instance-A-af-ipv4]vpn-target 1:1
[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip binding vpn-instance A
[R1-GigabitEthernet0/0/0]ip add 1.1.17.1 24
[R1]ip vpn-instance B
[R1-vpn-instance-B]route-distinguisher 2:2
[R1-vpn-instance-B-af-ipv4]vpn-target 1:2
[R1]int g0/0/1
[R1-GigabitEthernet0/0/1]ip binding vpn-instance B
[R1-GigabitEthernet0/0/1]ip add 1.1.18.1 24③======再实现CE与PE的互通（IGP[重分布]、EBGP）=============
左边(BGP)
[R1]bgp 1
[R1-bgp]peer 1.1.17.7 as-number 7
[R1-bgp]ipv4-family unicast
[R1-bgp-af-ipv4]peer 1.1.17.7 enable
[R1-bgp]peer 1.1.18.8 as-number 8
[R1-bgp]ipv4-family unicast
[R1-bgp-af-ipv4]peer 1.1.18.8 enable [R1]bgp 1
[R1-bgp]ipv4-family vpn-instance A
[R1-bgp-A]peer 1.1.17.7 as-number 7
[R1-bgp]ipv4-family vpn-instance B
[R1-bgp-B]peer 1.1.18.8 as-number 8[R7-bgp]dis this
bgp 7peer 1.1.17.1 as-number 1 ipv4-family unicastnetwork 1.1.17.0 255.255.255.0 network 7.7.7.7 255.255.255.255 peer 1.1.17.1 enable
[R8-bgp]dis this
bgp 8peer 1.1.18.1 as-number 1 ipv4-family unicastnetwork 1.1.18.0 255.255.255.0 network 8.8.8.8 255.255.255.255 peer 1.1.18.1 enable右边(ISIS)
[R6]isis 1 vpn-instance A
[R6-isis-1]network-entity 49.0000.0000.0000.0009.00
[R6-isis-1]is-level Level-2
[R6-isis-1]cost-style wide
[R6]isis 10 vpn-instance B
[R6-isis-10]network-entity 49.0000.0000.0000.0010.00
[R6-isis-10]cost-style wide
[R6-isis-10]is-level level-2
[R6]int g0/0/1
[R6-GigabitEthernet0/0/1]isis enable 1
[R6]int g0/0/2
[R6-GigabitEthernet0/0/2]isis enable 10[R6]bgp 2
[R6-bgp]ipv4-family vpn-instance A
[R6-bgp-A]import-route isis 1
[R6-bgp]ipv4-family vpn-instance B
[R6-bgp-B]import-route isis 10
[R6]isis 1 vpn-instance A
[R6-isis-1]import-route bgp
[R6]isis 10 vpn-instance B
[R6-isis-10]import-route bgp④==================运营商内配置MPLS LDP=================⑤=======在ASBR-PE设备上配置创建vpn实例，创建虚拟子接口绑定==========
[R3]ip vpn-instance A
[R3-vpn-instance-A]route-distinguisher 2:2
[R3-vpn-instance-A-af-ipv4]vpn-target 1:1
[R3]ip vpn-instance B
[R3-vpn-instance-B]route-distinguisher 3:3
[R3-vpn-instance-B-af-ipv4]vpn-target 1:2[R3]int g0/0/1.10
[R3-GigabitEthernet0/0/1.10]dot1q termination vid 10
[R3-GigabitEthernet0/0/1.10]ip add 1.11.34.3 24
[R3-GigabitEthernet0/0/1.10]arp broadcast enable
[R3]int g0/0/1.20
[R3-GigabitEthernet0/0/1.20]dot1q termination vid 20
[R3-GigabitEthernet0/0/1.20]ip binding vpn-instance B
[R3-GigabitEthernet0/0/1.20]ip add 1.111.34.3 24
[R3-GigabitEthernet0/0/1.20]arp broadcast enable[R4-GigabitEthernet0/0/0.10]dis th
#
interface GigabitEthernet0/0/0.10dot1q termination vid 10ip binding vpn-instance Aip address 1.11.34.4 255.255.255.0 arp broadcast enable
[R4-GigabitEthernet0/0/0.20]dis th
[V200R003C00]
#
interface GigabitEthernet0/0/0.20dot1q termination vid 20ip binding vpn-instance Bip address 1.111.34.4 255.255.255.0 arp broadcast enable⑥================在ASBR之间配置vpn实例的邻居关系===========
[R3-bgp-A]bgp 1
[R3-bgp]ipv4-family vpn-instance A
[R3-bgp-A]peer 1.11.34.4 as-number 2
[R3-bgp]ipv4-family vpn-instance B
[R3-bgp-B]peer 1.111.34.4 as-number 2[R4]bgp 2
[R4-bgp]ipv4-family vpn-instance A
[R4-bgp-A]peer 1.11.34.3 as-number 1
[R4-bgp]ipv4-family vpn-instance B
[R4-bgp-B]peer 1.111.34.3 as-number 13.数据包转发分析
详细过程：
①CE1的流量进入PE1的vpn实例中，将ipv4路由转为vpnv4路由，接着发送给ASBR-PE1并且携带vpn标签以及下一跳为PE1
②ASBR-PE1、P1的去往PE1的路由被MPLS LDP分配
③接着ASBR-PE1将VPNv4的路由转为IPv4的路由传送给ASBR-PE2（纯IP包）
④ASBR-PE1的流量进入PE2的vpn实例中，将ipv4路由转为vpnv4路由，接着发送给PE2并且携带vpn标签以及下一跳为ASBR-PE2
⑤PE2、P2的去往ASBR-PE2的路由被MPLS LDP分配
⑥最后PE2将vpnv4路由转为IPv4路由发送给CE2，下一跳为PE2
数据包走向
标签转发
AR4为R7回环口分发的vpn标签为1027
AR3为R9回环口分发的vpn标签为1029
R4为7.7.7.7打上的标签 1027
R1去往R3打的LDP标签为1024
R2去往R3打的LDP标签是3（弹出标签）
R3去往R4是纯IP包
R4去往R6打的是LDP标签是1025
R5去往R6打的是LDP标签是3（弹出标签）
