Requirements for Label Edge Router Forwarding of IPv4 Option Packets

Document Type Replaced Internet-Draft (individual)
Authors William Jaeger  , John Mullooly  , Tom Scholl  , David Smith 
Last updated 2010-01-05 (latest revision 2008-10-06)
Replaced by RFC 6178
Stream (None)
Intended RFC status (None)
Expired & archived
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Stream Stream state (No stream defined)
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IESG IESG state Replaced by draft-ietf-mpls-ip-options
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document imposes a new requirement on Label Edge Routers (LER) specifying that when determining whether to MPLS encapsulate an IP packet, the determination is made independent of any IP options that may be carried in the IP packet header. Lack of a formal standard may result in a different forwarding behavior for different IP packets associated with the same prefix-based Forwarding Equivalence Class (FEC). While an IP packet with either a specific option type or no header option may follow the MPLS label switched path (LSP) associated with a prefix-based FEC, an IP packet with a different option type but associated with the same prefix-based FEC may bypass MPLS encapsulation and instead be IP routed downstream. IP option packets that fail to be MPLS encapsulated simply due to their header options present a security risk against the MPLS infrastructure.


William Jaeger (
John Mullooly (
Tom Scholl (
David Smith (

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