3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 3 BGP/MPLS VPN Configuration3Com Corporation3-69#[CE] interface Serial2/0/0[CE-Serial2/0/0] link-protocol ppp[CE-Serial2/0/0] ip binding vpn-instance CE-VPN2[CE-Serial2/0/0] ip address 20.1.1.2 255.255.255.0#[CE] interface Serial3/0/0[CE-Serial3/0/0] link-protocol ppp[CE-Serial3/0/0] ip binding vpn-instance CE-VPN2[CE-Serial3/0/0] ip address 20.2.1.2 255.255.255.0#[CE] ospf 100 vpn-instance CE-VPN1[CE-ospf-100] vpn-instance-capability simple[CE-ospf-100] area 0.0.0.0[CE-ospf-100-area-0.0.0.0] network 10.1.1.0 0.0.0.255[CE-ospf-100-area-0.0.0.0] network 10.2.1.0 0.0.0.255#[CE] ospf 200 vpn-instance CE-VPN2[CE-ospf-200] vpn-instance-capability simple[CE-ospf-200] area 0.0.0.1[CE-ospf-100-area-0.0.0.1] network 20.1.1.0 0.0.0.255[CE-ospf-100-area-0.0.0.1] network 20.2.1.0 0.0.0.2553.4.10 Configuring Inter-Provider Backbones Option AI. Network requirementsCE1 and CE2 belong to the same VPN. CE1 accesses the network through PE1 in AS100 and CE2 accesses the network through PE2 in AS 200.Multi-AS BGP/MPLS VPN is implemented using Option A method. (That is,VPN-INSTANCE-to-VPN-INSTANCE method is used to manage VPN routes).The MPLS backbone network in the same AS adopts OSPF as the IGP.
