draft-ietf-bfd-multihop-02.txt   draft-ietf-bfd-multihop-03.txt 
Network Working Group D. Katz Network Working Group D. Katz
Internet Draft Juniper Networks Internet Draft Juniper Networks
D. Ward D. Ward
Cisco Systems Cisco Systems
Expires: September, 2005 March, 2005 Expires: January, 2006 July, 2005
BFD for Multihop Paths BFD for Multihop Paths
draft-ietf-bfd-multihop-02.txt draft-ietf-bfd-multihop-03.txt
Status of this Memo Status of this Memo
By submitting this Internet-Draft, I certify that any applicable By submitting this Internet-Draft, each author represents that any
patent or other IPR claims of which I am aware have been disclosed, applicable patent or other IPR claims of which he or she is aware
or will be disclosed, and any of which I become aware will be have been or will be disclosed, and any of which he or she becomes
disclosed, in accordance with RFC 3668. aware will be disclosed, in accordance with Section 6 of 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.
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
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material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
skipping to change at page 4, line 36 skipping to change at page 4, line 36
In the Passive role, by definition, the Unidirectional Receiver does In the Passive role, by definition, the Unidirectional Receiver does
not transmit any BFD Control packets until it learns the not transmit any BFD Control packets until it learns the
discriminator value in use by the other system (upon receipt of the discriminator value in use by the other system (upon receipt of the
first BFD Control packet.) The Unidirectional Receiver demultiplexes first BFD Control packet.) The Unidirectional Receiver demultiplexes
the first packet to the proper BFD session based on the physical or the first packet to the proper BFD session based on the physical or
logical link over which was received. This allows the receiver to logical link over which was received. This allows the receiver to
learn the remote discriminator value, which it then echoes back to learn the remote discriminator value, which it then echoes back to
the sender in its own (arbitrarily routed) BFD Control packet, after the sender in its own (arbitrarily routed) BFD Control packet, after
which time all packets are demultiplexed solely by discriminator. which time all packets are demultiplexed solely by discriminator.
4. Authentication 4. Encapsulation
The encapsulation of BFD Control packets for multihop application in
IPv4 and IPv6 is identical to that defined in [BFD-1HOP], except that
the UDP destination port MUST have a value of <TBD>. This can aid in
the demultiplexing and internal routing of incoming BFD packets.
5. Authentication
By their nature, multihop paths expose BFD to spoofing. By their nature, multihop paths expose BFD to spoofing.
Implementations of BFD SHOULD utilize authentication over multihop Implementations of BFD SHOULD utilize authentication over multihop
paths to help mitigate denial-of-service attacks. 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-02.txt, March, 2005. draft-ietf-bfd-base-03.txt, July, 2005.
[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-02.txt, March, 2005. Hop)", draft-ietf-bfd-v4v6-1hop-03.txt, July, 2005.
[BFD-MPLS] Aggarwal, R., and Kompella, K., "BFD for MPLS LSPs", [BFD-MPLS] Aggarwal, R., and Kompella, K., "BFD for MPLS LSPs",
draft-ietf-bfd-mpls-01.txt, February, 2005. draft-ietf-bfd-mpls-01.txt, February, 2005.
[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.
[OSPFv2] Moy, J., "OSPF Version 2", RFC 2328, April 1998. [OSPFv2] Moy, J., "OSPF Version 2", RFC 2328, April 1998.
[OSPFv3] Coltun, R., et al, "OSPF for IPv6", RFC 2740, December 1999. [OSPFv3] Coltun, R., et al, "OSPF for IPv6", RFC 2740, December 1999.
Security Considerations Security Considerations
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
An additional UDP port number needs to be allocated for use with
multihop BFD.
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
No changes were made other than updating references. The only substantive change was the requirement for a new UDP port
number for use with multihop BFD. All other changes were editorial
in nature.
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