Traffic Engineering for Bit Index Explicit Replication (BIER-TE)
draft-ietf-bier-te-arch-02
Network Working Group T. Eckert, Ed.
Internet-Draft Huawei
Intended status: Standards Track G. Cauchie
Expires: November 15, 2019 Bouygues Telecom
W. Braun
M. Menth
University of Tuebingen
May 14, 2019
Traffic Engineering for Bit Index Explicit Replication (BIER-TE)
draft-ietf-bier-te-arch-02
Abstract
This document proposes an architecture for BIER-TE: Traffic
Engineering for Bit Index Explicit Replication (BIER).
BIER-TE shares part of its architecture with BIER as described in
[RFC8279]. It also proposes to share the packet format with BIER.
BIER-TE forwards and replicates packets like BIER based on a
BitString in the packet header but it does not require an IGP. It
does support traffic engineering by explicit hop-by-hop forwarding
and loose hop forwarding of packets. It does support Fast ReRoute
(FRR) for link and node protection and incremental deployment.
Because BIER-TE like BIER operates without explicit in-network tree-
building but also supports traffic engineering, it is more similar to
SR than RSVP-TE.
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 November 15, 2019.
Eckert, et al. Expires November 15, 2019 [Page 1]
Internet-Draft BIER-TE ARCH May 2019
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
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 . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Layering . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. The Multicast Flow Overlay . . . . . . . . . . . . . . . 5
2.2. The BIER-TE Controller Host . . . . . . . . . . . . . . . 5
2.2.1. Assignment of BitPositions to adjacencies of the
network topology . . . . . . . . . . . . . . . . . . 6
2.2.2. Changes in the network topology . . . . . . . . . . . 6
2.2.3. Set up per-multicast flow BIER-TE state . . . . . . . 6
2.2.4. Link/Node Failures and Recovery . . . . . . . . . . . 6
2.3. The BIER-TE Forwarding Layer . . . . . . . . . . . . . . 7
2.4. The Routing Underlay . . . . . . . . . . . . . . . . . . 7
3. BIER-TE Forwarding . . . . . . . . . . . . . . . . . . . . . 7
3.1. The Bit Index Forwarding Table (BIFT) . . . . . . . . . . 7
3.2. Adjacency Types . . . . . . . . . . . . . . . . . . . . . 8
3.2.1. Forward Connected . . . . . . . . . . . . . . . . . . 8
3.2.2. Forward Routed . . . . . . . . . . . . . . . . . . . 9
3.2.3. ECMP . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.4. Local Decap . . . . . . . . . . . . . . . . . . . . . 9
3.3. Encapsulation considerations . . . . . . . . . . . . . . 10
3.4. Basic BIER-TE Forwarding Example . . . . . . . . . . . . 10
3.5. Forwarding comparison with BIER . . . . . . . . . . . . . 12
3.6. Requirements . . . . . . . . . . . . . . . . . . . . . . 13
4. BIER-TE Controller Host BitPosition Assignments . . . . . . . 13
4.1. P2P Links . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2. BFER . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Show full document text