rfc3140.txt

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RFC 3140         Per Hop Behavior Identification Codes         June 2001


4. IANA Considerations

   IANA is requested to create a new assignment registry for "Per-Hop
   Behavior Identification Codes", initially allowing values in the
   range 0 to 4095 decimal.

   Assignment of values in this field require:

      -  the identity of the assignee
      -  a brief description of the new PHB, with enough detail to
         distinguish it from existing standardized and non-standardized
         PHBs. In the case of a set of PHBs, this description should
         cover all PHBs in the set.
      -  a reference to a stable document describing the PHB in detail.

   During the first year of existence of this registry, IANA is
   requested to refer all requests to the IETF diffserv WG for review.
   Subsequently, requests should be reviewed by the IETF Transport Area
   Directors or by an expert that they designate.

   If the number of assignments begins to approach 4096, the Transport
   Area Directors should be alerted.

5. Security Considerations

   This encoding in itself raises no security issues. However, users of
   this encoding should consider that modifying a PHB identification
   code may constitute theft or denial of service, so protocols using
   this encoding must be adequately protected.

   Just signalling a PHBID SHOULD NOT be sufficient to grant the sender
   access to a PHB that it would otherwise not be able to use.  In cases
   where this is an issue, receivers SHOULD treat received PHBIDs as
   requests for service, and use local policy to determine whether to
   grant or deny such requests.

Changes from RFC 2836

   [RFC 2836] did not consider the Class Selector code points, which are
   covered by section 3 of the present document. A clarification has
   been added at the end of section 2 for the case of PHB Scheduling
   Classes.  The second paragraph of section 5 has been added.









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RFC 3140         Per Hop Behavior Identification Codes         June 2001


Acknowledgements

   Useful comments were made by members of the IETF Diffserv working
   group.

References

   [RFC 2119]  Bradner, S., "Key words for use in RFCs to Indicate
               Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC 2474]  Nichols, K., Blake, S., Baker, F. and D. Black,
               "Definition of the Differentiated Services Field (DS
               Field) in the IPv4 and IPv6 Headers", RFC 2474, December
               1998.

   [RFC 2475]  Blake, S., Black, D., Carlson, M., Davies, E., Wang, Z.
               and W. Weiss, "An Architecture for Differentiated
               Services", RFC 2475, December 1998.

   [RFC 2597]  Heinanen, J., Baker, F., Weiss, W. and J. Wroclawski,
               "Assured Forwarding PHB Group", RFC 2597, June 1999.

   [RFC 2836]  Brim, S., Carpenter, B. and F. Le Faucheur, "Per Hop
               Behavior Identification Codes", RFC 2836, May 2000.

   [MPLS-DS]   Le Faucheur, F., et al., "MPLS Support of Differentiated
               Services", Work in Progress.

Authors' Addresses

   David L. Black
   EMC Corporation
   42 South St.
   Hopkinton, MA   01748

   EMail: [e-mail]


   Scott W. Brim
   146 Honness Lane
   Ithaca, NY 14850
   USA

   EMail: [e-mail]







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RFC 3140         Per Hop Behavior Identification Codes         June 2001


   Brian E. Carpenter
   IBM
   c/o iCAIR
   Suite 150
   1890 Maple Avenue
   Evanston, IL 60201
   USA

   EMail: [e-mail]


   Francois Le Faucheur
   Cisco Systems
   Petra B - Les Lucioles
   291, rue Albert Caquot
   06560 Valbonne
   France

   EMail: [e-mail]

Intellectual Property

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   this standard.  Please address the information to the IETF Executive
   Director.










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RFC 3140         Per Hop Behavior Identification Codes         June 2001


Full Copyright Statement

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Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















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