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Knowledge Base

Differences Between LDP and MP-BGP Distribution Labels in MPLS VPN Scenarios

Publication Date:  2019-05-13  |   Views:  1155  |   Downloads:  0  |   Document ID:  EKB1100015045

Contents

Issue Description

What are the differences between LDP and MP-BGP distribution labels in MPLS VPN scenarios?

Solution

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.