Traffic Engineering for Bit Index Explicit Replication (BIER-TE)
draft-ietf-bier-te-arch-00
Network Working Group T. Eckert, Ed.
Internet-Draft Huawei
Intended status: Experimental G. Cauchie
Expires: July 27, 2018 Bouygues Telecom
W. Braun
M. Menth
University of Tuebingen
January 23, 2018
Traffic Engineering for Bit Index Explicit Replication (BIER-TE)
draft-ietf-bier-te-arch-00
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
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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 July 27, 2018.
Eckert, et al. Expires July 27, 2018 [Page 1]
Internet-Draft BIER-TE ARCH January 2018
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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
4. BIER-TE Controller Host BitPosition Assignments . . . . . . . 13
4.1. P2P Links . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2. BFER . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3. Leaf BFERs . . . . . . . . . . . . . . . . . . . . . . . 14
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