What are the differences between LDP and
MP-BGP distribution labels in MPLS VPN scenarios?
Dynamic LDP generates local in labels for IPv4 prefixes, that is, FEC,
allowing (FEC+label) binding to be flood to surroundings. By default, that
applies only to 32-bit host routes. The configuration can be changed as
required. MP-BGP can distribute labels for VPNv4 prefixes (RD+ipv4). Both share
the same set of labels, and labels are distributed in per platform per label
mode. The distributed LDP labels are the public network labels on an MPLS VPN,
that is, outer labels which are used to guide the private network data (carried
over VPNv4) recursion to PEs through LDP LSP. The distributed MP-BGP labels are
private network labels which are used to guide PEs in removing VPN data from
BGP VPNv5 labels and transferring the data to the corresponding VRF.