Enable a Signaling Protocol on the PE Routers

For VPNs to function, you must enable a signaling protocol on the provider edge (PE) routers. To enable a signaling protocol, you can do one of the following:

• Use LDP for VPN Signaling
• Use RSVP for VPN Signaling
  

  NOTE: As with any configuration involving Multiprotocol Label Switching (MPLS), you cannot configure any of the core-facing interfaces on the PE routers over Fast Ethernet Physical Interface Cards (PICs).