RFC 5443

LDP IGP Synchronization, March 2009

Canonical URL:
File formats:
Plain TextPDF
Updated by:
RFC 6138
M. Jork
A. Atlas
L. Fang
mpls (rtg)

Cite this RFC: TXT  |  XML

DOI:  http://dx.doi.org/10.17487/RFC5443

Other actions: Find Errata (if any)  |  Submit Errata  |  Find IPR Disclosures from the IETF


In certain networks, there is dependency on the edge-to-edge Label Switched Paths (LSPs) setup by the Label Distribution Protocol (LDP), e.g., networks that are used for Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) applications. For such applications, it is not possible to rely on Internet Protocol (IP) forwarding if the MPLS LSP is not operating appropriately. Blackholing of labeled traffic can occur in situations where the Interior Gateway Protocol (IGP) is operational on a link on which LDP is not. While the link could still be used for IP forwarding, it is not useful for MPLS forwarding, for example, MPLS VPN applications or Border Gateway Protocol (BGP) route-free cores. This document describes a mechanism to avoid traffic loss due to this condition without introducing any protocol changes. This memo provides information for the Internet community.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.

Download PDF Reader

Search RFCs
Advanced Search