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Requirements for Header Compression over MPLS (RFC4247)

IP.com Disclosure Number: IPCOM000130729D
Original Publication Date: 2005-Nov-01
Included in the Prior Art Database: 2005-Nov-03
Document File: 12 page(s) / 25K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Ash: AUTHOR [+4]

Abstract

Voice over IP (VoIP) typically uses the encapsulation voice/RTP/UDP/IP. When MPLS labels are added, this becomes voice/RTP/UDP/IP/MPLS-labels. For an MPLS VPN, the packet header is typically 48 bytes, while the voice payload is often no more than 30 bytes, for example. Header compression can significantly reduce the overhead through various compression mechanisms, such as enhanced compressed RTP (ECRTP) and robust header compression (ROHC). We consider using MPLS to route compressed packets over an MPLS Label Switched Path (LSP) without compression/decompression cycles at each router. This approach can increase the bandwidth efficiency as well as processing scalability of the maximum number of simultaneous flows that use header compression at each router. In this document, we give a problem statement, goals and requirements, and an example scenario.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 11% of the total text.

Network Working Group                                             J. Ash
Request for Comments: 4247                                      B. Goode
Category: Informational                                          J. Hand
                                                                    AT&T
                                                                R. Zhang
                                                              BT Infonet
                                                           November 2005


             Requirements for Header Compression over MPLS

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   Voice over IP (VoIP) typically uses the encapsulation
   voice/RTP/UDP/IP.  When MPLS labels are added, this becomes
   voice/RTP/UDP/IP/MPLS-labels.  For an MPLS VPN, the packet header is
   typically 48 bytes, while the voice payload is often no more than 30
   bytes, for example.  Header compression can significantly reduce the
   overhead through various compression mechanisms, such as enhanced
   compressed RTP (ECRTP) and robust header compression (ROHC).  We
   consider using MPLS to route compressed packets over an MPLS Label
   Switched Path (LSP) without compression/decompression cycles at each
   router.  This approach can increase the bandwidth efficiency as well
   as processing scalability of the maximum number of simultaneous flows
   that use header compression at each router.  In this document, we
   give a problem statement, goals and requirements, and an example
   scenario.


Ash, et al.                  Informational                      [Page 1]
RFC 4247     Requirements for Header Compression over MPLS November 2005


Table of Contents

   1. Introduction ....................................................2
   2. Problem Statement ...............................................3
      2.1. Specification of Requirements ..............................4
   3. Goals and Requirements ..........................................5
   4. Candidate Solution Methods and Needs ............................6
   5. Example Scenario ................................................7
   6. Security Considerations .........................................8
   7. Normative References ............................................8
   8. Informative Refe...