draft-ietf-isis-sbfd-discriminator-01.txt   draft-ietf-isis-sbfd-discriminator-02.txt 
Networking Working Group L. Ginsberg Networking Working Group L. Ginsberg
Internet-Draft N. Akiya Internet-Draft N. Akiya
Intended status: Standards Track Cisco Systems Intended status: Standards Track Cisco Systems
Expires: April 17, 2015 M. Chen Expires: September 3, 2015 M. Chen
Huawei Huawei
October 14, 2014 March 2, 2015
Advertising S-BFD Discriminators in IS-IS Advertising S-BFD Discriminators in IS-IS
draft-ietf-isis-sbfd-discriminator-01.txt draft-ietf-isis-sbfd-discriminator-02.txt
Abstract Abstract
This document defines a means of advertising one or more S-BFD This document defines a means of advertising one or more S-BFD
Discriminators using the IS-IS Router Capability TLV. Discriminators using the IS-IS Router Capability TLV.
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", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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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 http://datatracker.ietf.org/drafts/current/. Drafts is at http://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 April 17, 2015. This Internet-Draft will expire on September 3, 2015.
Copyright Notice Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the Copyright (c) 2015 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
(http://trustee.ietf.org/license-info) in effect on the date of (http://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
carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
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2. Encoding Format 2. Encoding Format
The IS-IS Router CAPABILITY TLV as defined in [RFC4971] will be used The IS-IS Router CAPABILITY TLV as defined in [RFC4971] will be used
to advertise S-BFD discriminators. A new sub-TLV is defined as to advertise S-BFD discriminators. A new sub-TLV is defined as
described below. S-BFD Discriminators sub-TLVs are formatted as described below. S-BFD Discriminators sub-TLVs are formatted as
specified in [RFC5305]. specified in [RFC5305].
No. of octets No. of octets
+-----------------------------+ +-----------------------------+
| Type (to be assigned by | 1 | Type (to be assigned by | 1
| IANA - suggested value 19) | | IANA - suggested value 20) |
+-----------------------------+ +-----------------------------+
| Length (multiple of 4) | 1 | Length (multiple of 4) | 1
+-----------------------------+ +-----------------------------+
| Discriminator Value(s) | 4/Discriminator | Discriminator Value(s) | 4/Discriminator
: : : :
+-----------------------------+ +-----------------------------+
Inclusion of the S-BFD Discriminators sub-TLV in a Router Capability Inclusion of the S-BFD Discriminators sub-TLV in a Router Capability
TLV is optional. Multiple S-BFD Discriminators sub-TLVs MAY be TLV is optional. Multiple S-BFD Discriminators sub-TLVs MAY be
advertised by an IS. When multiple S-BFD discriminators are advertised by an IS. When multiple S-BFD discriminators are
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then domain scope is appropriate. then domain scope is appropriate.
3. IANA Considerations 3. IANA Considerations
This document requires the definition of a new sub-TLV in the Sub- This document requires the definition of a new sub-TLV in the Sub-
TLVs for TLV 242 registry. The value written below is a suggested TLVs for TLV 242 registry. The value written below is a suggested
value subject to assignment by IANA. value subject to assignment by IANA.
Value Description Value Description
---- --------------------- ---- ---------------------
19 S-BFD Discriminators 20 S-BFD Discriminators
4. Security Considerations 4. Security Considerations
Security concerns for IS-IS are addressed in [IS-IS], [RFC5304], and Security concerns for IS-IS are addressed in [IS-IS], [RFC5304], and
[RFC5310]. Introduction of the S-BFD Discriminators sub-TLV [RFC5310]. Introduction of the S-BFD Discriminators sub-TLV
introduces no new security risks for IS-IS. introduces no new security risks for IS-IS.
Advertisement of the S-BFD discriminators does make it possible for Advertisement of the S-BFD discriminators does make 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
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Engineering", RFC 5305, October 2008. Engineering", RFC 5305, October 2008.
[RFC5310] Bhatia, M., Manral, V., Li, T., Atkinson, R., White, R., [RFC5310] Bhatia, M., Manral, V., Li, T., Atkinson, R., White, R.,
and M. Fanto, "IS-IS Generic Cryptographic and M. Fanto, "IS-IS Generic Cryptographic
Authentication", RFC 5310, February 2009. Authentication", RFC 5310, February 2009.
[RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection [RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection
(BFD)", RFC 5880, June 2010. (BFD)", RFC 5880, June 2010.
[S-BFD] "Seamless Bidirectional Forwarding Detection (S-BFD), [S-BFD] "Seamless Bidirectional Forwarding Detection (S-BFD),
draft-ietf-bfd-seamless-base-03(work in progress)", August draft-ietf-bfd-seamless-base-04(work in progress)",
2014. January 2015.
Authors' Addresses Authors' Addresses
Les Ginsberg Les Ginsberg
Cisco Systems Cisco Systems
510 McCarthy Blvd. 510 McCarthy Blvd.
Milpitas, CA 95035 Milpitas, CA 95035
USA USA
Email: ginsberg@cisco.com Email: ginsberg@cisco.com
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