draft-ietf-bfd-multihop-07.txt   draft-ietf-bfd-multihop-08.txt 
Network Working Group D. Katz Network Working Group D. Katz
Internet Draft Juniper Networks Internet Draft Juniper Networks
Intended status: Proposed Standard D. Ward Intended status: Proposed Standard D. Ward
Cisco Systems Cisco Systems
Expires: August, 2009 February 5, 2009 Expires: April, 2010 October 16, 2009
BFD for Multihop Paths BFD for Multihop Paths
draft-ietf-bfd-multihop-07.txt draft-ietf-bfd-multihop-08.txt
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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Copyright Notice Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the Copyright (c) 2009 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. to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the BSD License.
Abstract Abstract
This document describes the use of the Bidirectional Forwarding This document describes the use of the Bidirectional Forwarding
Detection protocol (BFD) over multihop paths, including Detection protocol (BFD) over multihop paths, including
unidirectional links. unidirectional links.
Conventions used in this document Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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5. Authentication 5. Authentication
By their nature, multihop paths expose BFD to spoofing. As the By their nature, multihop paths expose BFD to spoofing. As the
number of hops increase, the exposure to attack grows. As such, number of hops increase, the exposure to attack grows. As such,
implementations of BFD SHOULD utilize cryptographic authentication implementations of BFD SHOULD utilize cryptographic authentication
over multihop paths to help mitigate denial-of-service attacks. over multihop paths to help mitigate denial-of-service attacks.
Normative References Normative References
[BFD] Katz, D., and Ward, D., "Bidirectional Forwarding Detection", [BFD] Katz, D., and Ward, D., "Bidirectional Forwarding Detection",
draft-ietf-bfd-base-09.txt, February, 2009. draft-ietf-bfd-base-10.txt, October, 2009.
[BFD-1HOP] Katz, D., and Ward, D., "BFD for IPv4 and IPv6 (Single [BFD-1HOP] Katz, D., and Ward, D., "BFD for IPv4 and IPv6 (Single
Hop)", draft-ietf-bfd-v4v6-1hop-09.txt, February, 2009. Hop)", draft-ietf-bfd-v4v6-1hop-10.txt, October, 2009.
[KEYWORD] Bradner, S., "Key words for use in RFCs to Indicate [KEYWORD] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March 1997. Requirement Levels", RFC 2119, March 1997.
Informative References Informative References
[BFD-MPLS] Aggarwal, R., Kompella, K., et al, "BFD for MPLS LSPs", [BFD-MPLS] Aggarwal, R., Kompella, K., et al, "BFD for MPLS LSPs",
draft-ietf-bfd-mpls-07.txt, June, 2008. draft-ietf-bfd-mpls-07.txt, June, 2008.
[OSPFv2] Moy, J., "OSPF Version 2", RFC 2328, April 1998. [OSPFv2] Moy, J., "OSPF Version 2", RFC 2328, April 1998.
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As the number of hops increases, BFD becomes further exposed to As the number of hops increases, BFD becomes further exposed to
attack. The use of strong forms of authentication is strongly attack. The use of strong forms of authentication is strongly
encouraged. encouraged.
No additional security issues are raised in this document beyond No additional security issues are raised in this document beyond
those that exist in the referenced BFD documents. those that exist in the referenced BFD documents.
IANA Considerations IANA Considerations
This document has no actions for IANA. Port 4784 has been assigned by IANA for use with this protocol.
Authors' Addresses Authors' Addresses
Dave Katz Dave Katz
Juniper Networks Juniper Networks
1194 N. Mathilda Ave. 1194 N. Mathilda Ave.
Sunnyvale, California 94089-1206 USA Sunnyvale, California 94089-1206 USA
Phone: +1-408-745-2000 Phone: +1-408-745-2000
Email: dkatz@juniper.net Email: dkatz@juniper.net
Dave Ward Dave Ward
Cisco Systems Cisco Systems
170 W. Tasman Dr. 170 W. Tasman Dr.
San Jose, CA 95134 USA San Jose, CA 95134 USA
Phone: +1-408-526-4000 Phone: +1-408-526-4000
Email: dward@cisco.com Email: dward@cisco.com
Changes from the previous draft Changes from the previous draft
A note was added that the Echo function is not available for multihop The fact that the port number was assigned by IANA was added. All
BFD. All other changes are editorial in nature. other changes are editorial in nature.
This document expires in August, 2009. This document expires in April, 2010.
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