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Enabling LDP on the PE and P Routers

In this configuration example, the LDP is the signaling protocol between the PE routers. For the VPN to function, you must configure LDP on the two PE routers and on the P routers that are connected to the PE routers. You need to configure LDP only on the interfaces in the core of the service provider’s network; that is, between the PE and P routers and between the P routers. You do not need to configure LDP on the interface between the PE and CE routers.

In this configuration example, you configure LDP on the P routers’ loopback interfaces because these are the interfaces on which the MPLS LSP is configured.

On the PE routers, you must also configure family inet when you configure the logical interface.

On Router PE1, configure LDP:



[edit protocols]
ldp {
interface so-1/0/0.0;
}
[edit interfaces]
so-1/0/0 {


unit 0 {
family mpls;
}


}

On Router PE2, configure LDP:



[edit protocols]
ldp {
interface so-0/0/0.0;
}
[edit interfaces]
so-0/0/1 {


unit 0 {
family mpls;
}


}

On Router P1, configure LDP:



[edit protocols]
ldp {
interface so-1/0/0.0;
interface lo0;
}

On Router P3, configure LDP:



[edit protocols]
ldp {
interface lo0;
interface so-0/0/0.0;
}

On Router P2, although you do not need to configure LDP, you can optionally configure it to provide a fallback LDP path in case the RSVP LSP becomes nonoperational:



[edit protocols]
ldp {
interface so-1/1/0.0;
interface at-2/0/0.0;
}

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