BIER Ping and Trace
draft-ietf-bier-ping-07
Network Work group N. Kumar
Internet-Draft C. Pignataro
Intended status: Standards Track Cisco Systems, Inc.
Expires: November 12, 2020 N. Akiya
Big Switch Networks
L. Zheng
M. Chen
Huawei Technologies
G. Mirsky
ZTE Corp.
May 11, 2020
BIER Ping and Trace
draft-ietf-bier-ping-07
Abstract
Bit Index Explicit Replication (BIER) is an architecture that
provides optimal multicast forwarding through a "BIER domain" without
requiring intermediate routers to maintain any multicast related per-
flow state. BIER also does not require any explicit tree-building
protocol for its operation. A multicast data packet enters a BIER
domain at a "Bit-Forwarding Ingress Router" (BFIR), and leaves the
BIER domain at one or more "Bit-Forwarding Egress Routers" (BFERs).
The BFIR router adds a BIER header to the packet. The BIER header
contains a bit-string in which each bit represents exactly one BFER
to forward the packet to. The set of BFERs to which the multicast
packet needs to be forwarded is expressed by setting the bits that
correspond to those routers in the BIER header.
This document describes the mechanism and basic BIER OAM packet
format that can be used to perform failure detection and isolation on
BIER data plane.
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
Kumar, et al. Expires November 12, 2020 [Page 1]
Internet-Draft BIER Ping May 2020
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 12, 2020.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements notation . . . . . . . . . . . . . . . . . . 4
3. BIER OAM . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. BIER OAM message format . . . . . . . . . . . . . . . . . 4
3.2. Return Code . . . . . . . . . . . . . . . . . . . . . . . 7
3.3. BIER OAM TLV . . . . . . . . . . . . . . . . . . . . . . 8
3.3.1. Original SI-BitString TLV . . . . . . . . . . . . . . 8
3.3.2. Target SI-BitString TLV . . . . . . . . . . . . . . . 9
3.3.3. Incoming SI-BitString TLV . . . . . . . . . . . . . . 10
3.3.4. Downstream Mapping TLV . . . . . . . . . . . . . . . 11
3.3.5. Responder BFER TLV . . . . . . . . . . . . . . . . . 14
3.3.6. Responder BFR TLV . . . . . . . . . . . . . . . . . . 14
3.3.7. Upstream Interface TLV . . . . . . . . . . . . . . . 15
3.3.8. Reply-To TLV . . . . . . . . . . . . . . . . . . . . 15
3.4. Multipath Entropy Data Encoding . . . . . . . . . . . . . 16
4. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1. BIER OAM Processing . . . . . . . . . . . . . . . . . . . 16
4.2. Per BFER ECMP Discovery . . . . . . . . . . . . . . . . . 17
4.3. Sending BIER Echo Request . . . . . . . . . . . . . . . . 17
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