实验拓扑
需求：实现R5-R7，R6-R8两个租户的跨域MPLS VPN的私网互联。
配置思路
1. 搭建骨干网络，R1/2/3/4/9基础配置，设备名/接口IP/ISIS/MPLS/BGP。
2. R2-R3建立EGBP邻居，接口开启MPLS，配置策略P1（打MPLS标签）/P2（匹配到MPLS标签，打上MPLS标签），
R2⇄R3调用P1策略，R2→R1，R3→R4调用P2策略。打通R1-R4跨域段标签交换。
R1⇄R2 R3⇄R4开启标签路由能力， R2→R1 R3→R4修改BGP下一跳为本地。
3. R2发布1.1.1.1 32 R3发布4.4.4.4 32 BGP路由。R1/R4建立 EBGP VPNV4邻居关系，修改最大跳数255。
4. R1/R4配置vpn实列和RD/RT，接口绑定实例配置IP，R1与R5/6分别建立EBGP，R4与R7/8同样。R5/6/7/8发布环回口私网IP。
配置命令
#R1
sys
sysn R1
int g0/0/0
ip addr 19.0.0.1 24
int lo0
ip addr 1.1.1.1 32
ip vpn-instance 5
ipv4-family
route-distinguisher 5:5
vpn-target 5:7 export-extcommunity
vpn-target 7:5 import-extcommunity
ip vpn-instance 6
ipv4-family
route-distinguisher 6:6
vpn-target 6:8 export-extcommunity
vpn-target 8:6 import-extcommunity
int g0/0/1
ip binding vpn-instance 5
ip addr 15.0.0.1 24
int g0/0/2
ip binding vpn-instance 6
ip addr 16.0.0.1 24
isis 1
isis-level level-2
network-ent 49.0001.0000.0000.0001.00
int g0/0/0
isis en 1
int lo0
isis en 1
mpls lsr-id 1.1.1.1
mpls
mpls ldp
int g0/0/0
mpls
mpls ldp
bgp 12
router-id 1.1.1.1
undo default ipv4-unicast
peer 2.2.2.2 as 12
peer 2.2.2.2 connect-int lo0
peer 4.4.4.4 as 34
peer 4.4.4.4 ebgp-max-hop 255
peer 4.4.4.4 connect-int lo0
peer 15.0.0.5 as 5
peer 16.0.0.6 as 6
ipv4-family unicast
peer 2.2.2.2 en
peer 2.2.2.2 label-route-capability
ipv4-family vpnv4
peer 4.4.4.4 enable
ipv4-family vpn-instance 5
peer 15.0.0.5 as 5
ipv4-family vpn-instance 6
peer 16.0.0.6 as 6 #R9
sys
sysn R9
int g0/0/0
ip addr 19.0.0.9 24
int g0/0/1
ip addr 29.0.0.9 24
int lo0
ip addr 9.9.9.9 32
route-policy P1 permit node 10
apply mpls-label
route-policy P2 permit node 10
if-match mpls-label
apply mpls-label
isis 1
is-level level-2
network-ent 49.0009.0000.0000.0009.00
int g0/0/0
isis en 1
int g0/0/1
isis en 1
int lo0
isis en 1
mpls lsr-id 9.9.9.9
mpls
mpls ldp
int g0/0/0
mpls
mpls ldp
int g0/0/1
mpls
mpls ldp#R2
sys
sysn R2
int g0/0/1
ip addr 29.0.0.2 24
int g0/0/0
ip addr 23.0.0.2 24
mpls
int lo0
ip addr 2.2.2.2 32
route-policy P1 permit node 10
apply mpls-label
route-policy P2 permit node 10
if-match mpls-label
apply mpls-label
isis 1
is-level level-2
network-ent 49.0002.0000.0000.0003.00
int g0/0/1
isis en 1
int lo0
isis en 1
mpls lsr-id 2.2.2.2
mpls
mpls ldp
int g0/0/1
mpls
mpls ldp
route-policy P1 permit node 10
apply mpls-label
route-policy P2 permit node 10
if-match mpls-label
apply mpls-label
bgp 12
router-id 2.2.2.2
undo default ipv4-unicast
peer 1.1.1.1 as-number 12
peer 1.1.1.1 connect-int lo0
peer 23.0.0.3 as 34
ipv4-family unicast
network 1.1.1.1 32
peer 1.1.1.1 en
peer 1.1.1.1 route-policy P2 export
peer 1.1.1.1 next-hop-local
peer 1.1.1.1 label-route-capability
peer 23.0.0.3 en
peer 23.0.0.3 route-policy P1 export
peer 23.0.0.3 label-route-capability#R3
sys
sysn R3
int g0/0/0
ip addr 23.0.0.3 24
mpls
int g0/0/1
ip addr 34.0.0.3 24
int lo0
ip addr 3.3.3.3 32
route-policy P1 permit node 10
apply mpls-label
route-policy P2 permit node 10
if-match mpls-label
apply mpls-label
isis 1
is-level level-2
network-ent 49.0003.0000.0000.0003.00
int g0/0/1
isis en 1
int lo0
isis en 1
mpls lsr-id 3.3.3.3
mpls
mpls ldp
int g0/0/1
mpls
mpls ldp
route-policy P1 permit node 10
apply mpls-label
route-policy P2 permit node 10
if-match mpls-label
apply mpls-label
bgp 34
router-id 3.3.3.3
undo default ipv4-unicast
peer 4.4.4.4 as 34
peer 4.4.4.4 connect-int lo0
peer 23.0.0.2 as 12
ipv4-family unicast
network 4.4.4.4 32
peer 4.4.4.4 en
peer 4.4.4.4 route-policy P2 export
peer 4.4.4.4 next-hop-local
peer 4.4.4.4 label-route-capability
peer 23.0.0.2 en
peer 23.0.0.2 route-policy P1 export
peer 23.0.0.2 label-route-capability#R4
sys
sysn R4
int g0/0/0
ip addr 34.0.0.4 24
int lo0
ip addr 4.4.4.4 32
ip vpn-instance 7
ipv4-family
route-distinguisher 7:7
vpn-target 7:5 export-extcommunity
vpn-target 5:7 import-extcommunity
ip vpn-instance 8
ipv4-family
route-distinguisher 8:8
vpn-target 8:6 export-extcommunity
vpn-target 6:8 import-extcommunity
int g0/0/1
ip binding vpn-instance 7
ip addr 47.0.0.4 24
int g0/0/2
ip binding vpn-instance 8
ip addr 48.0.0.4 24
isis 1
is-level level-2
network-ent 49.0004.0000.0000.0004.00
int g0/0/0
isis en 1
int lo0
isis en 1
mpls lsr-id 4.4.4.4
mpls
mpls ldp
int g0/0/0
mpls
mpls ldp
bgp 34
router-id 4.4.4.4
undo default ipv4-unicast
peer 1.1.1.1 as 12
peer 1.1.1.1 ebgp-max-hop 255
peer 1.1.1.1 connect-int lo0
peer 3.3.3.3 as 34
peer 3.3.3.3 connect-int lo0
peer 47.0.0.7 as 7
peer 48.0.0.8 as 8
ipv4-family unicast
peer 3.3.3.3 enable
peer 3.3.3.3 label-route-capability
ipv4-family vpnv4
peer 1.1.1.1 enable
ipv4-family vpn-instance 7
peer 47.0.0.7 as 7
ipv4-family vpn-instance 8
peer 48.0.0.8 as 8 #R5
sys
sysn R5
int g0/0/0
ip addr 15.0.0.5 24
int lo0
ip addr 5.5.5.5 32
bgp 5
router-id 5.5.5.5
peer 15.0.0.1 as 12
ipv4-family unicast
netowrk 5.5.5.5 32
peer 15.0.0.1 en#R6
sys
sysn R6
int g0/0/0
ip addr 16.0.0.6 24
int lo0
ip addr 6.6.6.6 32
bgp 6
router-id 6.6.6.6
peer 16.0.0.1 as 12
ipv4-family unicast
netowrk 6.6.6.6 32
peer 16.0.0.1 en#R7
sys
sysn R7
int g0/0/0
ip addr 47.0.0.7 24
int lo0
ip addr 7.7.7.7 32
bgp 7
router-id 7.7.7.7
peer 47.0.0.4 as 34
ipv4-family unicast
netowrk 7.7.7.7 32
peer 47.0.0.4 en#R8
sys
sysn R8
int g0/0/0
ip addr 48.0.0.8 24
int lo0
ip addr 8.8.8.8 32
bgp 8
router-id 8.8.8.8
peer 48.0.0.4 as 34
ipv4-family unicast
netowrk 8.8.8.8 32
peer 48.0.0.4 en验证结果：
