A new Request for Comments is now available in online RFC libraries.
RFC 6178
Title: Label Edge Router Forwarding of
IPv4 Option Packets
Author: D. Smith, J. Mullooly,
W. Jaeger, T. Scholl
Status: Standards Track
Stream: IETF
Date: March 2011
Mailbox: djsmith@cisco.com,
jmullool@cisco.com,
wjaeger@att.com, tscholl@nlayer.net
Pages:
Characters: 21645
Updates: RFC3031
I-D Tag: draft-ietf-mpls-ip-options-07.txt
URL: http://www.rfc-editor.org/rfc/rfc6178.txt
This document specifies how Label Edge Routers (LERs) should behave
when determining whether to MPLS encapsulate an IPv4 packet with
header options. Lack of a formal standard has resulted in different
LER forwarding behaviors for IPv4 packets with header options despite
being associated with a prefix-based Forwarding Equivalence Class
(FEC). IPv4 option packets that belong to a prefix-based FEC, yet
are forwarded into an IPv4/MPLS network without being MPLS-
encapsulated, present a security risk against the MPLS
infrastructure. Further, LERs that are unable to MPLS encapsulate
IPv4 packets with header options cannot operate in certain MPLS
environments. While this newly defined LER behavior is mandatory to
implement, it is optional to invoke. [STANDARDS-TRACK]
This document is a product of the Multiprotocol Label Switching Working Group of the IETF.
This is now a Proposed Standard Protocol.
STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and suggestions
for improvements. Please refer to the current edition of the Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol. Distribution of this memo is unlimited.
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