< draft-ietf-idr-bgp-ls-sbfd-extensions-08.txt   draft-ietf-idr-bgp-ls-sbfd-extensions-09.txt >
Inter-Domain Routing Z. Li Inter-Domain Routing Z. Li
Internet-Draft S. Zhuang Internet-Draft S. Zhuang
Intended status: Standards Track Huawei Intended status: Standards Track Huawei
Expires: October 30, 2022 K. Talaulikar, Ed. Expires: November 5, 2022 K. Talaulikar, Ed.
Arrcus Inc Arrcus Inc
S. Aldrin S. Aldrin
Google, Inc Google, Inc
J. Tantsura J. Tantsura
Microsoft Microsoft
G. Mirsky G. Mirsky
Ericsson Ericsson
April 28, 2022 May 4, 2022
BGP Link-State Extensions for Seamless BFD BGP Link-State Extensions for Seamless BFD
draft-ietf-idr-bgp-ls-sbfd-extensions-08 draft-ietf-idr-bgp-ls-sbfd-extensions-09
Abstract Abstract
Seamless Bidirectional Forwarding Detection (S-BFD) defines a Seamless Bidirectional Forwarding Detection (S-BFD) defines a
simplified mechanism to use Bidirectional Forwarding Detection (BFD) simplified mechanism to use Bidirectional Forwarding Detection (BFD)
with large portions of negotiation aspects eliminated, thus providing with large portions of negotiation aspects eliminated, thus providing
benefits such as quick provisioning as well as improved control and benefits such as quick provisioning as well as improved control and
flexibility to network nodes initiating the path monitoring. The flexibility to network nodes initiating the path monitoring. The
link-state routing protocols (IS-IS and OSPF) have been extended to link-state routing protocols (IS-IS and OSPF) have been extended to
advertise the Seamless BFD (S-BFD) Discriminators. advertise the Seamless BFD (S-BFD) Discriminators.
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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-
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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 October 30, 2022. This Internet-Draft will expire on November 5, 2022.
Copyright Notice Copyright Notice
Copyright (c) 2022 IETF Trust and the persons identified as the Copyright (c) 2022 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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Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. BGP-LS Extensions for S-BFD Discriminator . . . . . . . . . . 3 3. BGP-LS Extensions for S-BFD Discriminator . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5. Manageability Considerations . . . . . . . . . . . . . . . . 5 5. Manageability Considerations . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 5 6. Security Considerations . . . . . . . . . . . . . . . . . . . 5
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 6 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . 6 8.1. Normative References . . . . . . . . . . . . . . . . . . 6
8.2. Informative References . . . . . . . . . . . . . . . . . 6 8.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction 1. Introduction
Seamless Bidirectional Forwarding Detection (S-BFD) [RFC7880] defines Seamless Bidirectional Forwarding Detection (S-BFD) [RFC7880] defines
a simplified mechanism to use Bidirectional Forwarding Detection a simplified mechanism to use Bidirectional Forwarding Detection
(BFD) [RFC5880] with large portions of negotiation aspects (BFD) [RFC5880] with large portions of negotiation aspects
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"OPTIONAL" in this document are to be interpreted as described in BCP "OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here. capitals, as shown here.
2. Terminology 2. Terminology
This memo makes use of the terms defined in [RFC7880]. This memo makes use of the terms defined in [RFC7880].
3. BGP-LS Extensions for S-BFD Discriminator 3. BGP-LS Extensions for S-BFD Discriminator
BGP-LS [RFC7752] specifies the Node NLRI for the advertisement of BGP-LS [RFC7752] specifies the Node Network Layer Reachability
nodes and their attributes using the BGP-LS Attribute. The S-BFD Information (NLRI) for the advertisement of nodes and their
discriminators of a node are considered a node-level attribute and attributes using the BGP-LS Attribute. The S-BFD discriminators of a
advertised as such. node are considered a node-level attribute and advertised as such.
This document defines a new BGP-LS Attribute TLV called the S-BFD This document defines a new BGP-LS Attribute TLV called the S-BFD
Discriminators TLV and its format is as follows: Discriminators TLV and its format is as follows:
0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | | Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Discriminator 1 | | Discriminator 1 |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | | ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Discriminator n (Optional) | | Discriminator n (Optional) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: S-BFD Discriminators TLV Figure 1: S-BFD Discriminators TLV
where: where:
o Type: 1032 (early allocation by IANA) o Type: 1032
o Length: variable. It MUST be a minimum of 4 octets and increments o Length: variable. It MUST be a minimum of 4 octets and increments
of 4 octets for each additional discriminator. by 4 octets for each additional discriminator.
o Discriminator n: 4 octets each, carrying an S-BFD local o Discriminator n: 4 octets each, carrying an S-BFD local
discriminator value of the node. At least one discriminator MUST discriminator value of the node. At least one discriminator MUST
be included in the TLV. be included in the TLV.
The S-BFD Discriminators TLV can be added to the BGP-LS Attribute The S-BFD Discriminators TLV can be added to the BGP-LS Attribute
associated with the Node NLRI that originates the corresponding associated with the Node NLRI that originates the corresponding
underlying IGP TLV/sub-TLV as described below. This information is underlying IGP TLV/sub-TLV as described below. This information is
derived from the protocol specific advertisements as follows: derived from the protocol specific advertisements as follows:
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The new protocol extensions introduced in this document augment the The new protocol extensions introduced in this document augment the
existing IGP topology information that can be distributed via BGP-LS existing IGP topology information that can be distributed via BGP-LS
[RFC7752]. Procedures and protocol extensions defined in this [RFC7752]. Procedures and protocol extensions defined in this
document do not affect the BGP security model other than as discussed document do not affect the BGP security model other than as discussed
in the Security Considerations section of [RFC7752]. More in the Security Considerations section of [RFC7752]. More
specifically, the aspects related to limiting the nodes and consumers specifically, the aspects related to limiting the nodes and consumers
with which the topology information is shared via BGP-LS to trusted with which the topology information is shared via BGP-LS to trusted
entities within an administrative domain. entities within an administrative domain.
The TLV introduced in this document is used to propagate IGP defined The TLV introduced in this document is used to propagate IGP defined
information ([RFC7883] and [RFC7883]). The TLV represents information ([RFC7883] and [RFC7884]). The TLV represents
information used to set up S-BFD sessions. The IGP instances information used to set up S-BFD sessions. The IGP instances
originating this information are assumed to support any required originating this information are assumed to support any required
security and authentication mechanisms (as described in [RFC7883] and security and authentication mechanisms (as described in [RFC7883] and
[RFC7883]) to prevent any security issues when propagating the [RFC7884]).
information into BGP-LS.
Advertising the S-BFD Discriminators via BGP-LS makes it possible for Advertising the S-BFD Discriminators via BGP-LS makes it possible for
attackers to initiate S-BFD sessions using the advertised attackers to initiate S-BFD sessions using the advertised
information. The vulnerabilities this poses and how to mitigate them information. The vulnerabilities this poses and how to mitigate them
are discussed in [RFC7880]. are discussed in [RFC7880].
7. Acknowledgements 7. Acknowledgements
The authors would like to thank Nan Wu for his contributions to this The authors would like to thank Nan Wu for his contributions to this
work. The authors would also like to thank Gunter Van De Velde and work. The authors would also like to thank Gunter Van De Velde and
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