< draft-ietf-bier-isis-extensions-09.txt   draft-ietf-bier-isis-extensions-10.txt >
Internet Engineering Task Force L. Ginsberg, Ed. Internet Engineering Task Force L. Ginsberg, Ed.
Internet-Draft Cisco Systems Internet-Draft Cisco Systems
Intended status: Standards Track A. Przygienda Intended status: Standards Track A. Przygienda
Expires: August 27, 2018 Juniper Networks Expires: September 12, 2018 Juniper Networks
S. Aldrin S. Aldrin
Google Google
J. Zhang J. Zhang
Juniper Networks, Inc. Juniper Networks, Inc.
February 23, 2018 March 11, 2018
BIER support via ISIS BIER support via ISIS
draft-ietf-bier-isis-extensions-09 draft-ietf-bier-isis-extensions-10
Abstract Abstract
This document defines ISIS extensions to support multicast forwarding This document defines ISIS extensions to support multicast forwarding
using the Bit Index Explicit Replication (BIER) architecture. using the Bit Index Explicit Replication (BIER) architecture.
Requirements Language Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 27, 2018. This Internet-Draft will expire on September 12, 2018.
Copyright Notice Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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5.3. Logging Misconfiguration . . . . . . . . . . . . . . . . 6 5.3. Logging Misconfiguration . . . . . . . . . . . . . . . . 6
5.4. Flooding Reduction . . . . . . . . . . . . . . . . . . . 6 5.4. Flooding Reduction . . . . . . . . . . . . . . . . . . . 6
6. Packet Formats . . . . . . . . . . . . . . . . . . . . . . . 6 6. Packet Formats . . . . . . . . . . . . . . . . . . . . . . . 6
6.1. BIER Info sub-TLV . . . . . . . . . . . . . . . . . . . . 7 6.1. BIER Info sub-TLV . . . . . . . . . . . . . . . . . . . . 7
6.2. BIER MPLS Encapsulation sub-sub-TLV . . . . . . . . . . . 8 6.2. BIER MPLS Encapsulation sub-sub-TLV . . . . . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9 7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 9 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
9.1. Normative References . . . . . . . . . . . . . . . . . . 9 9.1. Normative References . . . . . . . . . . . . . . . . . . 9
9.2. Informative References . . . . . . . . . . . . . . . . . 10 9.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction 1. Introduction
Bit Index Explicit Replication (BIER) [RFC8279] defines an Bit Index Explicit Replication (BIER) [RFC8279] defines an
architecture where all intended multicast receivers are encoded as architecture where all intended multicast receivers are encoded as
bitmask in the Multicast packet header within different bitmask in the Multicast packet header within different
encapsulations such as [RFC8296]. A router that receives such a encapsulations such as [RFC8296]. A router that receives such a
packet will forward the packet based on the Bit Position in the packet will forward the packet based on the Bit Position in the
packet header towards the receiver(s), following a precomputed tree packet header towards the receiver(s), following a precomputed tree
for each of the bits in the packet. Each receiver is represented by for each of the bits in the packet. Each receiver is represented by
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | | Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max SI |BS Len | Label | | Max SI |BS Len | Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type: value of 1 indicating MPLS encapsulation. Type: value of 1 indicating MPLS encapsulation.
Length: 4 Length: 4
Local BitString Length (BS Len): Encoded bitstring length as per
[RFC8296]. 4 bits.
Max SI Maximum Set Identifier (section 1 of [RFC8279]) used in the Max SI Maximum Set Identifier (section 1 of [RFC8279]) used in the
encapsulation for this BIER sub-domain for this bitstring length, encapsulation for this BIER sub-domain for this bitstring length,
1 octet. Each SI maps to a single label in the label range. The 1 octet. Each SI maps to a single label in the label range. The
first label is for SI=0, the second label is for SI=1, etc. first label is for SI=0, the second label is for SI=1, etc. If
the label associated with the Maximum Set Identifier exceeds the
20 bit range the sub-sub-TLV MUST be ignored.
Local BitString Length (BS Len): Encoded bitstring length as per
[RFC8296]. 4 bits.
Label: First label of the range, 20 bits. The labels are as defined Label: First label of the range, 20 bits. The labels are as defined
in [RFC8296]. in [RFC8296].
7. Security Considerations 7. Security Considerations
Security concerns for IS-IS are addressed in [RFC5304] and [RFC5310]. Security concerns for IS-IS are addressed in [RFC5304] and [RFC5310].
Advertisement of the additional information defined in this document Advertisement of the additional information defined in this document
introduces no new security concerns. introduces no new security concerns.
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