wdiff rfc7883.alt-original rfc7883.txt

Networking Working Group
Internet Engineering Task Force (IETF) L. Ginsberg
Internet-Draft N. Akiya
Intended status: Standards Track
Request for Comments: 7883 Cisco Systems
Expires: September 3, 2015
Category: Standards Track N. Akiya
ISSN: 2070-1721 Big Switch Networks
M. Chen
Huawei
March 2, 2015
July 2016

Advertising S-BFD Seamless Bidirectional Forwarding Detection (S-BFD)
Discriminators in IS-IS
draft-ietf-isis-sbfd-discriminator-02.txt

Abstract

This document defines a means of advertising one or more S-BFD Seamless
Bidirectional Forwarding Detection (S-BFD) Discriminators using the
IS-IS Router Capability CAPABILITY TLV.

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 RFC 2119 [RFC2119].

Status of This Memo

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provisions of BCP 78 and BCP 79.

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This Internet-Draft will expire on September 3, 2015.
http://www.rfc-editor.org/info/rfc7883.

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Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 ....................................................3
2. Encoding Format . . . . . . . . . . . . . . . . . . . . . . 2 .................................................3
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 .............................................4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 .........................................4
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . 4 ............................................4
Acknowledgements ...................................................5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 .................................................5

1. Introduction

[S-BFD]

[RFC7880] defines a simplified mechanism to use for using Bidirectional
Forwarding Detection (BFD)[RFC5880]. (BFD) [RFC5880]. This mechanism depends on
network nodes knowing the BFD discriminators which Discriminators that each node in the
network has reserved for this purpose. Use The use of the Intermediate
System to Intermediate System (IS-IS)[IS-IS] (IS-IS) [IS-IS] protocol is one
possible means of advertising these discriminators.

2. Encoding Format

The IS-IS Router CAPABILITY TLV as defined in [RFC4971] will be used
to advertise S-BFD discriminators. Seamless BFD (S-BFD) Discriminators. A new sub-TLV is
defined as described below. S-BFD Discriminators sub-TLVs are
formatted as specified in [RFC5305].

Inclusion

The inclusion of the an S-BFD Discriminators sub-TLV in a Router Capability
CAPABILITY TLV is optional. Multiple S-BFD Discriminators sub-TLVs
MAY be advertised by an IS. When multiple S-BFD discriminators are
advertised how How a given discriminator is mapped to a
specific use case when multiple S-BFD Discriminators are advertised
is out of scope for this document.

S-BFD discriminator Discriminator advertisements MAY be flooded within an area or
throughout the domain domain, using the procedures specified in [RFC4971].
The appropriate flooding scope depends on the intended use of S-BFD.
If S-BFD use usage will be exclusively within a Level-1 area area, then area
scope is appropriate. If S-BFD usage will span different L1 areas Level-1
areas, then domain scope is appropriate.

3. IANA Considerations

This document requires the definition of

IANA has added a new sub-TLV in the Sub-
TLVs "Sub-TLVs for TLV 242 242" registry.
The value written below registration is a suggested
value subject to assignment by IANA. as follows:

Value Description
---- ---------------------
----- --------------------
20 S-BFD Discriminators

4. Security Considerations

Security concerns for IS-IS are addressed in [IS-IS], [RFC5304], and
[RFC5310]. Introduction of the The new S-BFD Discriminators sub-TLV
introduces no does not introduce
any new security risks for IS-IS.

Advertisement of

Advertising the S-BFD discriminators does make Discriminators makes it possible for attackers
to initiate S-BFD sessions using the advertised information. The
vulnerabilities this poses and how to mitigate them are discussed in the Security Considerations section of [S-BFD].

6.
[RFC7880].

5. Normative References

[IS-IS] International Organization for Standardization,
"Intermediate system System to Intermediate system System intra-domain
routeing information exchange protocol for use in
conjunction with the protocol for providing the
connectionless-mode Network Service network service (ISO 8473), ISO/IEC
10589:2002, Second Edition.", Nov 8473)",
ISO Standard 10589, 2002.

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997. 1997,
<http://www.rfc-editor.org/info/rfc2119>.

[RFC4971] Vasseur, JP., Ed., Shen, N., Ed., and R. Aggarwal, Ed.,
"Intermediate System to Intermediate System (IS-IS)
Extensions for Advertising Router Information", RFC 4971,
DOI 10.17487/RFC4971, July 2007. 2007,
<http://www.rfc-editor.org/info/rfc4971>.

[RFC5304] Li, T. and R. Atkinson, "IS-IS Cryptographic
Authentication", RFC 5304, DOI 10.17487/RFC5304,
October 2008. 2008, <http://www.rfc-editor.org/info/rfc5304>.

[RFC5305] Li, T. and H. Smit, "IS-IS Extensions for Traffic
Engineering", RFC 5305, DOI 10.17487/RFC5305,
October 2008. 2008, <http://www.rfc-editor.org/info/rfc5305>.

[RFC5310] Bhatia, M., Manral, V., Li, T., Atkinson, R., White, R.,
and M. Fanto, "IS-IS Generic Cryptographic
Authentication", RFC 5310, DOI 10.17487/RFC5310,
February 2009. 2009, <http://www.rfc-editor.org/info/rfc5310>.

[RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection
(BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010.

[S-BFD] 2010,
<http://www.rfc-editor.org/info/rfc5880>.

[RFC7880] Pignataro, C., Ward, D., Akiya, N., Bhatia, M., and S.
Pallagatti, "Seamless Bidirectional Forwarding Detection (S-BFD),
draft-ietf-bfd-seamless-base-04(work in progress)",
January 2015.

5.
(S-BFD)", RFC 7880, DOI 10.17487/RFC7880, July 2016,
<http://www.rfc-editor.org/info/rfc7880>.

Acknowledgements

The authors wish to thank Sam Aldrin, Manav Bhatia, and Carlos
Pignataro for input essential to defining the needed functionality.

Authors' Addresses

Les Ginsberg
Cisco Systems
510 McCarthy Blvd.
Milpitas, CA 95035
USA
United States of America

Email: ginsberg@cisco.com

Nobo Akiya
Cisco Systems
Big Switch Networks

Email: nobo@cisco.com nobo.akiya.dev@gmail.com

Mach(Guoyi) Chen
Huawei

Email: mach.chen@huawei.com