配置IP地址
[CE1-GigabitEthernet0/0/0]ip add 20.1.1.1 24
[CE1-GigabitEthernet0/0/1]ip add 10.1.1.1 24
[AR2-GigabitEthernet0/0/0]ip add 20.1.1.2 24
[AR2-GigabitEthernet0/0/1]ip add 30.1.1.2 24
[PE1-GigabitEthernet0/0/0]ip add 30.1.1.3 24
[PE1-GigabitEthernet0/0/1]ip add 40.1.1.3 24
[PE1-LoopBack0]ip add 3.3.3.3 32
[PE2-GigabitEthernet0/0/0]ip add 40.1.1.4 24
[PE2-GigabitEthernet0/0/1]ip add 11.1.1.4 24
[PE2-LoopBack0]ip add 4.4.4.4 32
[CE2-GigabitEthernet0/0/0]ip add 11.1.1.5 24
[CE2-GigabitEthernet0/0/1]ip add 10.2.1.5 24
配置PE的路由及MPLS
[PE1]mpls lsr-id 3.3.3.3
[PE1]mpls
[PE1-mpls]lsp-trigger all
[PE1]mpls ldp
[PE1]ospf 1
[PE1-ospf-1]area 0
[PE1-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[PE1-ospf-1-area-0.0.0.0]network 40.1.1.0 0.0.0.255
[PE1-GigabitEthernet0/0/1]mpls
[PE1-GigabitEthernet0/0/1]mpls ldp
[PE2]mpls lsr-id 4.4.4.4
[PE2]mpls
[PE2-mpls]lsp-trigger all
[PE2]mpls ldp
[PE2]ospf 1
[PE2-ospf-1]area 0
[PE2-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[PE2-ospf-1-area-0.0.0.0]network 40.1.1.0 0.0.0.255
[PE2-GigabitEthernet0/0/0]mpls
[PE2-GigabitEthernet0/0/0]mpls ldp
在PE1创建VPN实例vpn1并与GRE隧道绑定
[PE1]ip vpn-instance vpn1
[PE1-vpn-instance-vpn1]route-distinguisher 100:1
[PE1-vpn-instance-vpn1-af-ipv4]vpn-target 111:1 export-extcommunity
[PE1-vpn-instance-vpn1-af-ipv4]vpn-target 111:1 import-extcommunity
[PE1]int Tunnel 0/0/1
[PE1-Tunnel0/0/1]ip binding vpn-instance vpn1
[PE1-Tunnel0/0/1]ip add 2.2.2.3 24
在PE2创建VPN实例vpn1并与PC侧接口绑定
[PE2]ip vpn-instance vpn1
[PE2-vpn-instance-vpn1]route-distinguisher 200:1
[PE2-vpn-instance-vpn1-af-ipv4]vpn-target 111:1 export-extcommunity
[PE2-vpn-instance-vpn1-af-ipv4]vpn-target 111:1 import-extcommunity
[PE2-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
[PE2-GigabitEthernet0/0/1]ip add 11.1.1.4 24
配置GRE隧道的Tunnel接口
[CE1]int Tunnel 0/0/1
[CE1-Tunnel0/0/1]tunnel-protocol gre
[CE1-Tunnel0/0/1]source 20.1.1.1
[CE1-Tunnel0/0/1]destination 30.1.1.3
[CE1-Tunnel0/0/1]ip add 2.2.2.1 24
[PE1]int Tunnel 0/0/1
[PE1-Tunnel0/0/1]tunnel-protocol gre
[PE1-Tunnel0/0/1]source 30.1.1.3
[PE1-Tunnel0/0/1]destination 20.1.1.1
配置CE1、AR2和PE1之间的路由协议
[CE1]ospf 2
[CE1-ospf-2]area 0
[CE1-ospf-2-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[AR2]ospf 2
[AR2-ospf-2]area 0
[AR2-ospf-2-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[AR2-ospf-2-area-0.0.0.0]network 30.1.1.0 0.0.0.255
[PE1]ospf 2
[PE1-ospf-2]area 0
[PE1-ospf-2-area-0.0.0.0]network 30.1.1.0 0.0.0.255
配置CE1与PE1之间的IS-IS路由
[CE1]isis 20
[CE1-isis-20]network-entity 20.0000.0000.0001.00
[CE1-GigabitEthernet0/0/0]isis enable 20
[CE1-Tunnel0/0/1]isis enable 20
[PE1]isis 20 vpn-instance vpn1
[PE1-isis-20]network-entity 20.0000.0000.0003.00
[PE1]int Tunnel 0/0/1
[PE1-Tunnel0/0/1]isis enable 20
配置CE2与PE2之间的IS-IS路由
[CE2]isis 20
[CE2-isis-20]network-entity 20.0000.0000.0005.00
[CE2-GigabitEthernet0/0/0]isis enable 20
[CE2-GigabitEthernet0/0/1]isis enable 20
[PE2]isis 20 vpn-instance vpn1
[PE2-isis-20]network-entity 20.0000.0000.0004.00
[PE2-GigabitEthernet0/0/1]isis enable 20
在PE之间建立MP-IBGP对等体
[PE1]bgp 100
[PE1-bgp]peer 4.4.4.4 as-number 100
[PE1-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[PE1-bgp]ipv4-family vpnv4
[PE1-bgp-af-vpnv4]peer 4.4.4.4 enable
[PE1-bgp]ipv4-family vpn-instance vpn1 //进入BGP的vpn1实例
[PE1-bgp-vpn1]import-route isis 20 //引入IS-IS路由
[PE2]bgp 100
[PE2-bgp]peer 3.3.3.3 as-number 100
[PE2-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[PE2-bgp]ipv4-family vpnv4
[PE2-bgp-af-vpnv4]peer 3.3.3.3 enable
[PE2-bgp]ipv4-family vpnv4
[PE2-bgp]ipv4-family vpn-instance vpn1
[PE2-bgp-vpn1]import-route isis 20
在IS-IS中引入BGP路由
[PE1]isis 20
[PE1-isis-20]import-route bgp
[PE2]isis 20
[PE2-isis-20]import-route bgp
检查配置
