Typical Configuration of MPLS/BGP VPN on AR28/AR46 Series Routers

Typical Configuration of MPLS/BGP VPN on AR28/AR46 Series Routers

【Requirements】 

1. RTA is a P router; RTB and RTC are PE routers.

2. Host 192.168.11.1/24 and host 192.168.12.1/24 belong to vpna; host 192.168.21.1/24 and host 192.168.22.1/24 belong to vpnb.

【Topology】

 

【Scripts】

RT-A’s scripts

#  sysname RTA #  router id 1.1.1.1                        /configure the router id/ #  mpls lsr-id 1.1.1.1                      /configure the mpls lsr-id/ # mpls                                      /enable mpls in system view/ #  mpls ldp                                 /enable ldp in system view/ # interface Ethernet0/0  ip address 10.1.1.1 255.255.255.252  mpls                                     /enable mpls in interface view/  mpls ldp enable                          /enable ldp in interface view/ # interface Ethernet3/0  ip address 10.1.1.5 255.255.255.252  mpls                                     /enable mpls in interface view/  mpls ldp enable                          /enable ldp in interface view/ # interface LoopBack0  ip address 1.1.1.1 255.255.255.255     /loopback 0’s IP address equals the router id/ # ospf 1  area 0.0.0.0   network 1.1.1.1 0.0.0.0                 /enable ospf in interface loopback 0/   network 10.1.1.0 0.0.0.3                /enable ospf in network 10.1.1.0/   network 10.1.1.4 0.0.0.3                /enable ospf in network 10.1.1.4/ # return

RT-B’s scripts

#  sysname RTB #  router id 1.1.1.2                        /configure the router id/ #  mpls lsr-id 1.1.1.2                      /configure the mpls lsr-id/ # mpls                                      /enable mpls in system view/ #  mpls ldp                                 /enable ldp in system view/ # ip vpn-instance vpna                      /create a vpn instance vpna/  route-distinguisher 100:1                /configure RD=100:1/  vpn-target 100:1 export-extcommunity     /configure RT=100:1 export/  vpn-target 100:1 import-extcommunity     /configure RT=100:1 import/ # ip vpn-instance vpnb                      /create a vpn instance vpnb/  route-distinguisher 200:1                /configure RD=200:1/  vpn-target 200:1 export-extcommunity     /configure RT=200:1 export/  vpn-target 200:1 import-extcommunity     /configure RT=200:1 import/ # interface Ethernet0/0  ip address 10.1.1.2 255.255.255.252  mpls                                     /enable mpls in interface view/  mpls ldp enable                          /enable ldp in interface view/ # interface LoopBack0  ip address 1.1.1.2 255.255.255.255     /loopback 0’s IP address equals the router id/ # interface LoopBack11  ip binding vpn-instance vpna             /bind Loopback 11 with vpna/  ip address 192.168.11.1 255.255.255.0 # interface LoopBack21  ip binding vpn-instance vpnb             /bind Loopback 21 with vpnb/  ip address 192.168.21.1 255.255.255.0 # bgp 100  undo synchronization                     /forbid BGP synchronization/  group inter internal                     /create an internal group “inter”/  peer 1.1.1.3 group inter                 /build iBGP neighbourship with 1.1.1.3/  peer 1.1.1.3 connect-interface LoopBack0         /communicate with 1.1.1.3 using LoopBack0/  #  ipv4-family vpn-instance vpna            /bind vpna with MBGP ipv4-family/   import-route direct                     /import direct route/   undo synchronization                    /forbid BGP synchronization/  #  ipv4-family vpn-instance vpnb            /bind vpnb with MBGP ipv4-family/   import-route direct   undo synchronization  #  ipv4-family vpnv4                          peer inter enable                       /enable group “inter” in ipv4-family view/   peer 1.1.1.3 group inter                /enable 1.1.1.3/ # ospf 1  area 0.0.0.0   network 1.1.1.2 0.0.0.0                 /enable ospf in interface loopback 0/   network 10.1.1.0 0.0.0.3                /enable ospf in network 10.1.1.0/ # return

RT-C’s scripts

#  sysname RTC #  router id 1.1.1.3                        /configure the router id/ #  mpls lsr-id 1.1.1.3                      /configure the mpls lsr-id/ # mpls                                      /enable mpls in system view/ #  mpls ldp                                 /enable ldp in system view/ # ip vpn-instance vpna                      /create a vpn instance vpna/  route-distinguisher 100:1                /configure RD=100:1/  vpn-target 100:1 export-extcommunity     /configure RT=100:1 export/  vpn-target 100:1 import-extcommunity     /configure RT=100:1 import/ # ip vpn-instance vpnb                      /create a vpn instance vpnb/  route-distinguisher 200:1                /configure RD=200:1/  vpn-target 200:1 export-extcommunity     /configure RT=200:1 export/  vpn-target 200:1 import-extcommunity     /configure RT=200:1 import/ # interface Ethernet2/0  ip address 10.1.1.6 255.255.255.252  mpls                                     /enable mpls in interface view/  mpls ldp enable                          /enable ldp in interface view/ # interface LoopBack0  ip address 1.1.1.3 255.255.255.255     /loopback 0’s IP address equals the router id/ # interface LoopBack12  ip binding vpn-instance vpna             /bind Loopback 12 with vpna/  ip address 192.168.12.1 255.255.255.0 # interface LoopBack22  ip binding vpn-instance vpnb             /bind Loopback 22 with vpnb/  ip address 192.168.22.1 255.255.255.0 # bgp 100  undo synchronization                     /forbid BGP synchronization/  group inter internal                     /create an internal group “inter”/  peer 1.1.1.2 group inter                 /build iBGP neighbourship with 1.1.1.2/  peer 1.1.1.2 connect-interface LoopBack0         /communicate with 1.1.1.2 using LoopBack0/  #  ipv4-family vpn-instance vpna           /bind vpna with MBGP ipv4-family/   import-route direct                    /import direct route/   undo synchronization                   /forbid BGP synchronization/  #  ipv4-family vpn-instance vpnb           /bind vpnb with MBGP ipv4-family/   import-route direct   undo synchronization  #  ipv4-family vpnv4                           peer inter enable                      /enable group “inter” in ipv4-family view/  peer 1.1.1.2 group inter               /enable 1.1.1.2/ # ospf 1  area 0.0.0.0   network 1.1.1.3 0.0.0.0               /enable ospf in interface loopback 0/   network 10.1.1.4 0.0.0.3              /enable ospf in network 10.1.1.4/ # return

【Attentions】

1、 As a P router, RTA is only in charge of MPLS forwarding. It has nothing to do with specific VPNs.

2、 Loopback 0’s  IP address must have a mask of 32 bits.