RFC 3443 (rfc3443) - Page 1 of 10


Time To Live (TTL) Processing in Multi-Protocol Label Switching (MPLS) Networks



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Network Working Group                                         P. Agarwal
Request for Comments: 3443                                       Brocade
Updates: 3032                                                   B. Akyol
Category: Standards Track                                  Cisco Systems
                                                            January 2003


                   Time To Live (TTL) Processing in
             Multi-Protocol Label Switching (MPLS) Networks

Status of this Memo

   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.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This document describes Time To Live (TTL) processing in hierarchical
   Multi-Protocol Label Switching (MPLS) networks and is motivated by
   the need to formalize a TTL-transparent mode of operation for an MPLS
   label-switched path.  It updates RFC 3032, "MPLS Label Stack
   Encoding".  TTL processing in both Pipe and Uniform Model
   hierarchical tunnels are specified with examples for both "push" and
   "pop" cases.  The document also complements RFC 3270, "MPLS Support
   of Differentiated Services" and ties together the terminology
   introduced in that document with TTL processing in hierarchical MPLS
   networks.

Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC-2119].

1. Introduction and Motivation

   This document describes Time To Live (TTL) processing in hierarchical
   MPLS networks.  We believe that this document adds details that have
   not been addressed in [MPLS-ARCH, MPLS-ENCAPS], and that the methods
   presented in this document complement [MPLS-DS].




Agarwal & Akyol             Standards Track


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