BIER-TE Forwarding
draft-zcxh-bier-te-forwarding-00

Document Type Active Internet-Draft (individual)
Last updated 2017-09-19
Stream (None)
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
BIER WG                                                    Yongqing. Zhu
Internet-Draft                                              Huanan. Chen
Intended status: Standards Track                           China Telecom
Expires: March 23, 2018                                      Quan. Xiong
                                                             Fangwei. Hu
                                                         ZTE Corporation
                                                      September 19, 2017

                           BIER-TE Forwarding
                  draft-zcxh-bier-te-forwarding-00.txt

Abstract

   Traffic Engineering for Bit Index Explicit Replication (BIER-TE)
   shares part of architecture, definition and packet format with Bit
   Index Explicit Replication (BIER) according to the introduction in
   [I-D.eckert-bier-te-arch].  But BIER-TE supports the traffic
   engineering by explicit hop-by-hop forwarding and loose hop
   forwarding of packets.

   This document proposes a set of extensions to realize the BIER-TE
   forwarding including the assignment of BitPositions to adjacencies
   and the configuration of Bit Index Forwarding Table (BIFT).

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 23, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Zhu, et al.              Expires March 23, 2018                 [Page 1]
Internet-Draft             BIER-TE Forwarding             September 2017

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Operation Overview  . . . . . . . . . . . . . . . . . . .   3
     1.3.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  BIER-TE Forwarding  . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  The Assignment of BitPositions to Adjacencies . . . . . .   5
     2.2.  The configuration of BIFT . . . . . . . . . . . . . . . .   5
   3.  BIER-TE Forwarding Example  . . . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Traffic Engineering for Bit Index Explicit Replication (BIER-TE)
   shares part of architecture, definition and packet format with Bit
   Index Explicit Replication (BIER) according to the introduction in
   [I-D.eckert-bier-te-arch].  But BIER-TE supports the traffic
   engineering by explicit hop-by-hop forwarding and loose hop
   forwarding of packets.

   [I-D.ietf-bier-mpls-encapsulation] specifies a BIER encapsulation
   that BIER header contains a bitstring in which each bit represents
   one egress router in the domain.  But in BIER-TE, every BitPosition
   of the BitString of a BIER-TE packet indicates one or more
   adjacencies which BFRs will transit packets passing though.  BFRs
   recognizes BitStrings or packets for every Sub-Domain-ID(SD),
   BitStringLength(BSL) and Set Identification(SI) combination.

   [I-D.eckert-bier-te-arch] discussed the process of the BIER-TE
   forwarding including Bit Index Forwarding Table (BIFT) and forwarding
   example.  The BIER-TE controller host determines and assigns the
   BitPositions to the adjacencies which explicit paths can be built
Show full document text