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全局路由表应用

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      CE 1
      version 12.2
      !
      hostname CE-1
      !
      ip subnet-zero
      !
      interface Loopback0
      ip address 10.1.1.1 255.255.255.255
      !
      interface Loopback2
      ip address 11.11.11.1 255.255.255.0
      !
      interface Serial8/0
      ip address 192.168.10.1 255.255.255.252
      
      !--- The interface is connected to PE 1.
      
      !
      ip classless
      ip route 0.0.0.0 0.0.0.0 192.168.10.2
      
      !--- This is the default route to route all packets to PE 1.
      
      !
      
      PE 1
      version 12.2
      !
      hostname PE-1
      !
      ip subnet-zero
      !
      ip vrf customer1
      
      !--- This configured VRF customer1.
      
      rd 100:1
      
      !--- This configured the route distiguisher for VRF.
      
      route-target export 1:1
      route-target import 1:1
      
      !--- This configured the export and import policies into VRF.
      
      !
      ip cef
      
      !--- This enabled Cisco Express Forwarding (CEF) switching.
      
      !
      interface Loopback0
      ip address 10.1.1.2 255.255.255.255
      !
      interface Ethernet0/0
      
      !--- It is connected to P router.
      
      ip address 10.10.23.2 255.255.255.0
      tag-switching ip
      
      !--- MPLS switching is enabled.
      
      !
      interface Serial8/0
      ! Connected to CE-1
      ip vrf forwarding customer1
      
      !--- Route forwarding based on customer1 VRF is enabled.
      
      ip address 192.168.10.2 255.255.255.252
      !
      router ospf 1
      log-adjacency-changes
      redistribute static subnets
      network 0.0.0.0 255.255.255.255 area 0
      !
      router bgp 100
      no synchronization
      bgp log-neighbor-changes
      neighbor 10.1.1.4 remote-as 100
      
      !--- Neighbor relationship with PE 2 is established.
      
      neighbor 10.1.1.4 update-source Loopback0
      neighbor 10.1.1.4 next-hop-self
      no auto-summary
      !
      address-family ipv4 vrf customer1
      
      !--- The address-family configuration mode specifies IPv4 unicast
      !---address prefixes for customer1 VRF.
      
      no auto-summary
      no synchronization
      network 11.11.11.0 mask 255.255.255.0
      
      !--- CE 1 network 11.11.11.0/24 to PE 2 is announced.
      
      network 192.168.10.0 mask 255.255.255.252
      exit-address-family
      !
      address-family vpnv4
      
      !--- This is the address-family VPNV4 configuration mode for
      !--- configuring BGP sessions.
      
      neighbor 10.1.1.4 activate
      neighbor 10.1.1.4 send-community extended
      no auto-summary
      exit-address-family
      !
      ip classless
      ip route 11.11.11.0 255.255.255.0 Serial8/0 192.168.10.1
      
      !--- The static route in the global routing table is pointing to
      !--- the interface connected to CE 1.
      
      ip route vrf customer1 0.0.0.0 0.0.0.0 192.168.67.1 global
      
      !--- The static default route under customer1 VRF, routing packets
      !--- outside of VPN to the Internet gateway.
      
      ! routes
      ip route vrf customer1 11.11.11.0 255.255.255.0 192.168.10.1
      
      !--- The static route for network 11.11.11.0/24 (CE-1 Network) under
      !---customer1 VRF ensures the reachability of CE 1 network from the
      !--- other VPN sites
      
      P
      version 12.2
      !
      hostname P
      !
      ip subnet-zero
      !
      ip cef
      
      !--- CEF switching is enabled.
      
      !
      interface Loopback0
      ip address 10.1.1.3 255.255.255.255
      !
      interface Ethernet0/0
      
      !--- This is connected to PE 1.
      
      ip address 10.10.23.3 255.255.255.0
      tag-switching ip
      
      !--- MPLS switching is enabled.
      
      !
      interface Ethernet1/0
      
      !--- This is connected to PE 2.
      
      ip address 10.10.34.3 255.255.255.0
      tag-switching ip
      !
      interface Ethernet2/0
      
      !--- This is connected to the Internet gateway.
      
      ip address 10.10.36.3 255.255.255.0
      tag-switching ip
      !
      router ospf 1
      log-adjacency-changes
      network 0.0.0.0 255.255.255.255 area 0
      IGW
      version 12.2
      !
      hostname IGW
      !
      ip subnet-zero
      !
      ip cef
      
      !--- This enabled CEF switching.
      
      !
      interface Loopback0
      ip address 10.1.1.6 255.255.255.255
      !
      interface Ethernet2/0
      
      !--- This is connected to P router.
      
      ip address 10.10.36.6 255.255.255.0
      tag-switching ip
      !
      interface Serial8/0
      
      !--- This is connected to Internet R7.
      
      ip address 192.168.67.1 255.255.255.252
      !
      router ospf 1
      log-adjacency-changes
      network 0.0.0.0 255.255.255.255 area 0
      !
      router bgp 100
      no synchronization
      bgp log-neighbor-changes
      network 11.11.11.0 mask 255.255.255.0
      network 22.22.22.0 mask 255.255.255.0
      neighbor 192.168.67.2 remote-as 200
      no auto-summary
      
      PE 2
      version 12.2
      !
      hostname PE-2
      !
      ip subnet-zero
      !
      ip vrf customer1
      
      !--- Customer1 VRF is configured.
      
      rd 100:1
      
      !--- Route Distinguisher for VRF is configured.
      
      route-target export 1:1
      route-target import 1:1
      
      !--- This configured the import and export policies for customer1
      !--- VRF.
      
      !
      ip cef
      
      !--- This enabled CEF switching.
      
      !
      interface Loopback0
      ip address 10.1.1.4 255.255.255.255
      interface Ethernet1/0
      
      !--- Connected to P router.
      
      ip address 10.10.34.4 255.255.255.0
      tag-switching ip
      
      !--- MPLS switching is enabled.
      
      !
      interface Serial9/0
      
      !--- Connected to CE 2 router.
      
      ip vrf forwarding customer1
      
      !--- This enables VRF forwarding on the interface.
      
      ip address 192.168.20.1 255.255.255.252
      !
      router ospf 1
      log-adjacency-changes
      redistribute static subnets
      network 0.0.0.0 255.255.255.255 area 0
      !
      router bgp 100
      no synchronization
      bgp log-neighbor-changes
      neighbor 10.1.1.2 remote-as 100
      neighbor 10.1.1.2 update-source Loopback0
      neighbor 10.1.1.2 next-hop-self
      no auto-summary
      !
      address-family ipv4 vrf customer1
      
      !--- This is the address-family IPv4 configuration of customer1 VRF.
      
      no auto-summary
      no synchronization
      network 22.22.22.0 mask 255.255.255.0
      
      !--- This announces the CE 2 network to PE 1.
      
      exit-address-family
      !
      address-family vpnv4
      
      !--- This is the address-family VPNV4 configuration for BGP Sessions
      !--- with PE 1.
      
      neighbor 10.1.1.2 activate
      neighbor 10.1.1.2 send-community extended
      no auto-summary
      exit-address-family
      !
      ip classless
      ip route 22.22.22.0 255.255.255.0 Serial9/0 192.168.20.2
      
      !--- This is the static route for network 22.22.22.0/24 in the global
      !--- routing table pointing to the interface connected to CE 2.
      
      ip route vrf customer1 0.0.0.0 0.0.0.0 192.168.67.1 global
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