1-2 router ospf process-id vrf name

1-2 router ospf process-id vrf name

Syntax Description:

• process-id ” The OSPF process ID. The range of values is 1 to 65535.

• name ” VPN Routing/Forwarding Instance (VRF) name. Routes learned by the OSPF process will be placed in the VRF instead of the global IP routing table.

Purpose: In a Multiprotocol Label Switching (MPLS) virtual private network (VPN) environment, this form of the OSPF router command is used to transfer VPN customer routes between the service provider and the VPN customer. In an MPLS/VPN environment, there are three types of routers, as shown in Figure 1-2.

Figure 1-2. General MPLS/VPN Architecture

• Provider (P) routers

• Customer edge (CE) routers

• Provider edge (PE) routers

P routers are routers in the service provider network that have no connections to CE routers. PE routers are the interface routers between the customer and the service provider. Tag or label switching and an interior gateway protocol (IGP), such as OSPF, are run between P and PE routers to exchange internal service provider routes. These routes are installed in the global IP routing table on the P and PE routers. The PE routers have additional IP routing tables, one for each attached VPN customer. These routing tables are called VRF instances. When OSPF is configured using the vrf option, routes learned from the CE will be placed into the appropriate VRF on the PE router. These VPN routes will be exchanged between PE routers via multiprotocol IBGP. For a detailed discussion of MPLS and MPLS VPNs, see the Cisco Press book MPLS and VPN Architectures by Ivan Pepelnjak and Jim Guichard.

Initial IOS Software Release: 12.0