draft-ietf-idr-bgp-ls-sbfd-extensions-00.txt   draft-ietf-idr-bgp-ls-sbfd-extensions-01.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: December 1, 2019 K. Talaulikar Expires: May 4, 2020 K. Talaulikar
Cisco Systems Cisco Systems
S. Aldrin S. Aldrin
Google, Inc Google, Inc
J. Tantsura J. Tantsura
Apstra Apstra
G. Mirsky G. Mirsky
ZTE Corp. ZTE Corp.
May 30, 2019 November 1, 2019
BGP Link-State Extensions for Seamless BFD BGP Link-State Extensions for Seamless BFD
draft-ietf-idr-bgp-ls-sbfd-extensions-00 draft-ietf-idr-bgp-ls-sbfd-extensions-01
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-
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 December 1, 2019. This Internet-Draft will expire on May 4, 2020.
Copyright Notice Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the Copyright (c) 2019 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
skipping to change at page 2, line 41 skipping to change at page 2, line 41
3. Problem and Requirement . . . . . . . . . . . . . . . . . . . 3 3. Problem and Requirement . . . . . . . . . . . . . . . . . . . 3
4. BGP-LS Extensions for S-BFD Discriminator . . . . . . . . . . 4 4. BGP-LS Extensions for S-BFD Discriminator . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6. Manageability Considerations . . . . . . . . . . . . . . . . 6 6. Manageability Considerations . . . . . . . . . . . . . . . . 6
6.1. Operational Considerations . . . . . . . . . . . . . . . 6 6.1. Operational Considerations . . . . . . . . . . . . . . . 6
6.2. Management Considerations . . . . . . . . . . . . . . . . 6 6.2. Management Considerations . . . . . . . . . . . . . . . . 6
7. Security Considerations . . . . . . . . . . . . . . . . . . . 6 7. Security Considerations . . . . . . . . . . . . . . . . . . . 6
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
9.1. Normative References . . . . . . . . . . . . . . . . . . 7 9.1. Normative References . . . . . . . . . . . . . . . . . . 7
9.2. Informative References . . . . . . . . . . . . . . . . . 7 9.2. Informative References . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
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
eliminated, thus providing benefits such as quick provisioning as eliminated, thus providing benefits such as quick provisioning as
well as improved control and flexibility to network nodes initiating well as improved control and flexibility to network nodes initiating
the path monitoring. the path monitoring.
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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: TBD (see IANA Considerations Section 5) o Type: 1032
o Length: variable. Minimum of 8 octets and increments of 4 octets o Length: variable. Minimum of 8 octets and increments of 4 octets
there on for each additional discriminator there on for each additional discriminator
o Discriminators : multiples of 4 octets, each carrying a S-BFD o Discriminators : multiples of 4 octets, each carrying a S-BFD
local discriminator value of the node. At least one discriminator local discriminator value of the node. At least one discriminator
MUST be included in the TLV. MUST be included in the TLV.
The S-BFD Discriminators TLV can only be added to the BGP-LS The S-BFD Discriminators TLV can only be added to the BGP-LS
Attribute associated with the Node NLRI that originates the Attribute associated with the Node NLRI that originates the
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When the node is not running any of the IGPs but running a protocol When the node is not running any of the IGPs but running a protocol
like BGP, then the locally provisioned S-BFD discriminators of the like BGP, then the locally provisioned S-BFD discriminators of the
node MAY be originated as part of the BGP-LS attribute within the node MAY be originated as part of the BGP-LS attribute within the
Node NLRI corresponding to the local node. Node NLRI corresponding to the local node.
5. IANA Considerations 5. IANA Considerations
This document requests assigning code-points from the registry "BGP- This document requests assigning code-points from the registry "BGP-
LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute
TLVs" based on table below. The column "IS-IS TLV/Sub-TLV" defined TLVs" based on table below which reflects the values assigned via the
in the registry does not require any value and should be left empty. early allocation process. The column "IS-IS TLV/Sub-TLV" defined in
the registry does not require any value and should be left empty.
+---------------+--------------------------+----------+ +---------------+--------------------------+----------+
| Code Point | Description | Length | | Code Point | Description | Length |
+---------------+--------------------------+----------+ +---------------+--------------------------+----------+
| TBD | S-BFD Discriminators TLV | variable | | 1032 | S-BFD Discriminators TLV | variable |
+---------------+--------------------------+----------+ +---------------+--------------------------+----------+
6. Manageability Considerations 6. Manageability Considerations
This section is structured as recommended in [RFC5706]. This section is structured as recommended in [RFC5706].
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 was distributed via [RFC7752]. existing IGP topology information that was distributed via [RFC7752].
Procedures and protocol extensions defined in this document do not Procedures and protocol extensions defined in this document do not
affect the BGP protocol operations and management other than as affect the BGP protocol operations and management other than as
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May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
9.2. Informative References 9.2. Informative References
[I-D.ietf-mpls-seamless-mpls] [I-D.ietf-mpls-seamless-mpls]
Leymann, N., Decraene, B., Filsfils, C., Konstantynowicz, Leymann, N., Decraene, B., Filsfils, C., Konstantynowicz,
M., and D. Steinberg, "Seamless MPLS Architecture", draft- M., and D. Steinberg, "Seamless MPLS Architecture", draft-
ietf-mpls-seamless-mpls-07 (work in progress), June 2014. ietf-mpls-seamless-mpls-07 (work in progress), June 2014.
[I-D.ietf-spring-segment-routing-policy] [I-D.ietf-spring-segment-routing-policy]
Filsfils, C., Sivabalan, S., daniel.voyer@bell.ca, d., Filsfils, C., Sivabalan, S., Voyer, D., Bogdanov, A., and
bogdanov@google.com, b., and P. Mattes, "Segment Routing P. Mattes, "Segment Routing Policy Architecture", draft-
Policy Architecture", draft-ietf-spring-segment-routing- ietf-spring-segment-routing-policy-03 (work in progress),
policy-03 (work in progress), May 2019. May 2019.
[RFC5706] Harrington, D., "Guidelines for Considering Operations and [RFC5706] Harrington, D., "Guidelines for Considering Operations and
Management of New Protocols and Protocol Extensions", Management of New Protocols and Protocol Extensions",
RFC 5706, DOI 10.17487/RFC5706, November 2009, RFC 5706, DOI 10.17487/RFC5706, November 2009,
<https://www.rfc-editor.org/info/rfc5706>. <https://www.rfc-editor.org/info/rfc5706>.
[RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection [RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection
(BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010, (BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010,
<https://www.rfc-editor.org/info/rfc5880>. <https://www.rfc-editor.org/info/rfc5880>.
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