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LDP IGP Synchronization

Document type: Replaced Internet-Draft (mpls WG)
Document stream: IETF
Last updated: 2008-03-24 (latest revision 2008-02-25)
Intended RFC status: Unknown
Other versions: (expired, archived): plain text, pdf, html

IETF State: WG Document
Document shepherd: No shepherd assigned

IESG State: Replaced by draft-ietf-mpls-ldp-igp-sync
Responsible AD: (None)
Send notices to: No addresses provided

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


In certain networks there is a dependency on edge-to-edge LSPs setup by LDP, e.g. networks that are used for MPLS VPN applications. For such applications it is not possible to rely on IP forwarding if the MPLS LSP is not operating appropriately. Blackholing of labeled traffic can occur in situations where the IGP is operational on a link but LDP is not operational on that link. While the link could still be used for IP forwarding, it is not useful for traffic with packets carrying a label stack of more than one label or when the IP address carried in the packet is out of the RFC1918 space. This document describes a mechanism to avoid traffic loss due to this condition without introducing any protocol changes.


Markus Jork <>

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)