iTable of Contents1 MPLS L3VPN Configuration ·····················································································································1-1MPLS L3VPN Overview ··························································································································1-1Introduction to MPLS L3VPN ··········································································································1-1MPLS L3VPN Concepts ··················································································································1-2MPLS L3VPN Packet Forwarding ···································································································1-5MPLS L3VPN Networking Schemes ·······························································································1-6MPLS L3VPN Routing Information Advertisement··········································································1-8Multi-AS VPN···································································································································1-9Carrier’s Carrier ·····························································································································1-12Nested VPN···································································································································1-14HoVPN···········································································································································1-16OSPF VPN Extension····················································································································1-19BGP AS Number Substitution ·······································································································1-21MPLS L3VPN Configuration Task List ··································································································1-22Configuring VPN Instances···················································································································1-23Creating a VPN Instance ···············································································································1-23Associating a VPN Instance with an Interface ··············································································1-23Configuring Route Related Attributes of a VPN Instance······························································1-24Configuring a Tunneling Policy of a VPN Instance ·······································································1-25Configuring Basic MPLS L3VPN···········································································································1-26Configuration Prerequisites ···········································································································1-26Configuring a VPN Instance ··········································································································1-26Configuring Route Advertisement between PE and CE································································1-27Configuring Route Advertisement Between PEs···········································································1-31Configuring Routing Features for BGP VPNv4 Subaddress Family ·············································1-32Configuring Inter-Provider VPN ············································································································1-35Configuration Prerequisites ···········································································································1-35Configuring Inter-Provider VPN Option A······················································································1-35Configuring Inter-Provider VPN Option B······················································································1-36Configuring Inter-Provider VPN Option C······················································································1-37Configuring Nested VPN·······················································································································1-39Configuration Prerequisites ···········································································································1-39Configuring Nested VPN ···············································································································1-39Configuring HoVPN·······························································································································1-40Configuration Prerequisites ···········································································································1-40Configuring HoVPNs ·····················································································································1-40Configuring OSPF Sham Link···············································································································1-41Configuration Prerequisites ···········································································································1-41Configuring a Loopback Interface ·································································································1-42Advertising Routes of a Loopback Interface ·················································································1-42Creating a Sham Link ····················································································································1-42Configuring BGP AS Number Substitution ···························································································1-43Configuration Prerequisites ···········································································································1-43
