Enable a Signaling Protocol on the PE Routers

For VPNs to function, you must enable a signaling protocol on the PE routers. You can do one of the following:

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

  As with any configuration involving MPLS, you cannot configure any of the core-facing interfaces on the PE routers over Fast Ethernet PICs.