BIER Z. Zhang
Internet-Draft ZTE Corporation
Intended status: Standards Track A. Przygienda
Expires: April 29, 2018 Juniper Networks, Inc.
October 26, 2017
BIER in IPv6
draft-zhang-bier-bierin6-00
Abstract
BIER is a new architecture for the forwarding of multicast data
packets. This document defines native IPv6 encapsulation for BIER
hop-by-hop forwarding or BIERin6 for short.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC2119.
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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Internet-Drafts are draft documents valid for a maximum of six months
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 29, 2018.
Copyright Notice
Copyright (c) 2017 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
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carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. IPv6 Header . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. BIER Header . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
BIER [I-D.ietf-bier-architecture] is a new architecture for the
forwarding of multicast data packets. It provides optimal forwarding
through a "multicast domain' and it does not necessarily precondition
construction of a multicast distribution tree, nor does it require
intermediate nodes to maintain any per-flow state.
[I-D.ietf-bier-mpls-encapsulation] defines the BIER encapsulation
format in MPLS and non-MPLS environment that rely on MPLS labels or
special ethernet type support. In pure IPv6 environments a BIER
packet could be forwarded by means of simple IPv6 hop-by-hop
processing only, without any new hardware support. Ultimate hardware
support is obviously possible but the encapsulation is especially
interesting for environments like [RFC7368] where high throughput
multicast forwarding performance is not decisive and could be
initially done in slow-path or end host (assuming last-hop being IPv6
encapsulated).
This document defines native BIER IPv6 [RFC2460] encapsulation we
call BIERv6. This encapsulation is aligned with the format defined
in [I-D.ietf-bier-mpls-encapsulation] for a non-mpls version.
This document uses terminology defined in
[I-D.ietf-bier-architecture].
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2. IPv6 Header
The BIER packet itself is the payload of an IPv6 frame. The
destination address field in IPv6 packet MAY be the neighbor's link-
local or one of the loopback interface addresses of that neighbor.
The destination address SHOULD be the BFR-prefix advertised by IGP/
BGP extensions for BIER. TTL value of 1 MUST be used on the IPv6
packet.
The source address field in IPv6 packet MAY be the loopback interface
address of the sending BFIR. The address SHOULD be the BFR-prefix
advertised in IGP/BGP extension.
A new next-protocol type in IPv6 Next header field of TBD indicates
the following BIER packet.
The Flow-ID in the IPv6 packet SHOULD be copied from the entropy
field in the BIER encapsulation.
3. BIER Header
S bit in BIER header has no significance in this environment. It
should be set to 1 upon transmission, but it MUST be ignored upon
reception.
TC bits in BIER header have no significance in this environment since
the IPv6 packet TC takes precedence on processing. It should be set
to zero upon transmission, but it MUST be ignored upon reception.
The BIFT-id is used to indicate the combination of <SD, SI, BSL>
normally; it should be set to the value advertised by the next-hop
BFR through e.g. IGP [I-D.ietf-bier-ospf-bier-extensions],
[I-D.zhang-bier-babel-extensions] or BGP
[I-D.ietf-bier-idr-extensions] extension for BIER.
The remaining fields defined in BIER header MUST assume the same
values and be afforded same treatement as specified in
[I-D.ietf-bier-mpls-encapsulation].
4. IANA Considerations
IANA is requested to set up a new type of "Next header" registry
value for BIERv6 in the "Assigned Internet Protocol Numbers"
registry.
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5. Security Considerations
General IPv6 and BIER security considerations apply.
6. References
6.1. Normative References
[I-D.ietf-bier-architecture]
Wijnands, I., Rosen, E., Dolganow, A., Przygienda, T., and
S. Aldrin, "Multicast using Bit Index Explicit
Replication", draft-ietf-bier-architecture-08 (work in
progress), September 2017.
[I-D.ietf-bier-idr-extensions]
Xu, X., Chen, M., Patel, K., Wijnands, I., and T.
Przygienda, "BGP Extensions for BIER", draft-ietf-bier-
idr-extensions-03 (work in progress), August 2017.
[I-D.ietf-bier-mpls-encapsulation]
Wijnands, I., Rosen, E., Dolganow, A., Tantsura, J.,
Aldrin, S., and I. Meilik, "Encapsulation for Bit Index
Explicit Replication in MPLS and non-MPLS Networks",
draft-ietf-bier-mpls-encapsulation-10 (work in progress),
October 2017.
[I-D.ietf-bier-ospf-bier-extensions]
Psenak, P., Kumar, N., Wijnands, I., Dolganow, A.,
Przygienda, T., Zhang, Z., and S. Aldrin, "OSPF Extensions
for BIER", draft-ietf-bier-ospf-bier-extensions-09 (work
in progress), October 2017.
[I-D.zhang-bier-babel-extensions]
Zhang, Z. and T. Przygienda, "BIER in BABEL", draft-zhang-
bier-babel-extensions-01 (work in progress), June 2017.
[RFC2460] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", RFC 2460, DOI 10.17487/RFC2460,
December 1998, <https://www.rfc-editor.org/info/rfc2460>.
6.2. Informative References
[RFC7368] Chown, T., Ed., Arkko, J., Brandt, A., Troan, O., and J.
Weil, "IPv6 Home Networking Architecture Principles",
RFC 7368, DOI 10.17487/RFC7368, October 2014,
<https://www.rfc-editor.org/info/rfc7368>.
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Authors' Addresses
Zheng(Sandy) Zhang
ZTE Corporation
EMail: zzhang_ietf@hotmail.com
Tony Przygienda
Juniper Networks, Inc.
EMail: prz@juniper.net
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