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Using 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 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.

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