Use LDP for VPN Signaling

To use Label Distribution Protocol (LDP) for VPN signaling, perform the following steps on the PE and provider (P) routers:

1. Configure LDP on the interfaces in the core of the service provider's network by including the ldp statement at the [edit protocols] hierarchy level. You need to configure LDP only on the interfaces between PE routers or between PE and P routers. You can think of these as the "core-facing" interfaces. You do not need to configure LDP on the interface between the PE and customer edge (CE) routers.

[edit]

protocols {

    ldp {

        interface type-fpc/pic/port;

    }

} 

2. Configure the MPLS address family on the interfaces on which you enabled LDP (the interfaces you configured in Step 1) by including the family mpls statement at the [edit interfaces type-fpc/pic/port unit logical-unit-number] hierarchy level:

[edit]

interfaces {

    type-fpc/pic/port {

        unit logical-unit-number {

            family mpls;

        }

    }

}

3. Configure Open Shortest Path First (OSPF) or Intermediate System-to-Intermediate System (IS-IS) on each PE and P router. You configure these protocols at the master instance of the routing protocol, not within the routing instance used for the VPN.

To configure OSPF, include the ospf statement at the [edit protocols] hierarchy level. At a minimum, you must configure a backbone area on at least one of the router's interfaces.

[edit]

protocols {

    ospf {

        area 0.0.0.0 {

            interface type-fpc/pic/port; 

        } 

    }

} 

To configure IS-IS, include the isis statement at the [edit protocols] hierarchy level and configure the loopback interface and International Organization for Standardization (ISO) family at the [edit interfaces] hierarchy level. At a minimum, you must enable IS-IS on the router, configure a network entity title (NET) on one of the router's interfaces (preferably the loopback interface, lo0), and configure the ISO family on all interfaces on which you want IS-IS to run. When you enable IS-IS, Level 1 and Level 2 are enabled by default. The following is the minimum IS-IS configuration. In the address statement, address is the NET.

[edit]

interfaces {

    lo0 {

        unit logical-unit-number {

            family iso {

                address address;

            }

        }

    }

    type-fpc/pic/port {

        unit logical-unit-number {

            family iso;

        }

    }

}

protocols {

    isis {

        interface all;

    }

} 

For more information about configuring OSPF and IS-IS, see the JUNOS Routing Protocols Configuration Guide.