SIDR
Internet Engineering Task Force (IETF)                      P. Mohapatra
Internet-Draft
Request for Comments: 8097                              Sproute Networks
Intended status:
Category: Standards Track                                       K. Patel
Expires: July 14, 2017                                             Cisco
ISSN: 2070-1721                                             Arrcus, Inc.
                                                              J. Scudder
                                                        Juniper Networks
                                                                 D. Ward
                                                                   Cisco
                                                                 R. Bush
                                         Internet Initiative Japan, Inc.
                                                        January 10,
                                                              March 2017

         BGP Prefix Origin Validation State Extended Community
             draft-ietf-sidr-origin-validation-signaling-11

Abstract

   This document defines a new BGP opaque extended community to carry
   the origination AS Autonomous System (AS) validation state inside an
   autonomous system.
   IBGP  Internal BGP (IBGP) speakers that receive this
   validation state can configure local policies allowing that allow it to
   influence their decision process.

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 July 14, 2017.
   http://www.rfc-editor.org/info/rfc8097.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Origin Validation State Extended Community  . . . . . . . . .   2
   3.  Deployment Considerations . . . . . . . . . . . . . . . . . .   3
   4.  Acknowledgements  .  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  IANA  Security Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  Security Considerations .  References  . . . . . . . . . . . . . . . . . .   4
   7.  References . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.1.  Normative
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Acknowledgements  . . . . . . .   4
     7.2.  Informative References . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   This document defines a new BGP opaque extended community to carry
   the origination AS validation state inside an autonomous system.
   IBGP speakers that receive this validation state can configure local
   policies allowing that allow it to influence their decision process.

1.1.  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].

2.  Origin Validation State Extended Community

   The origin validation state extended community is an opaque extended
   community [RFC4360] with the following encoding:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |       0x43    |      0x00     |             Reserved          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    Reserved                   |validationstate|
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The value of the high-order octet of the extended Type Field field is 0x43,
   which indicates it is non-transitive.  The value of the low-order
   octet of the extended type Type field as assigned by IANA is 0x00.  The
   Reserved field MUST be set to 0 and ignored upon the receipt of this
   community.  The last octet of the extended community is an unsigned
   integer that gives the route's validation state [RFC6811].  It can
   assume the following values:

                     +-------+-----------------------------+
                     | Value | Meaning                     |
                     +-------+-----------------------------+
                     |   0   | Lookup result = "valid"     |
                     |   1   | Lookup result = "not found" |
                     |   2   | Lookup result = "invalid"   |
                     +-------+-----------------------------+

   If the router is configured to support the extensions defined in this
   draft,
   document, it SHOULD attach the origin validation state extended
   community to BGP UPDATE messages sent to IBGP peers by mapping the
   computed validation state in the last octet of the extended
   community.  Similarly  Similarly, on the receiving IBGP speakers, the validation
   state of an IBGP route SHOULD be derived directly from the last octet
   of the extended community, if present.

   An implementation SHOULD NOT send more than one instance of the
   origin validation state extended community.  However, if more than
   one instance is received, an implementation MUST disregard all
   instances other than the one with the numerically-greatest numerically greatest validation
   state value.  If the value received is greater than the largest
   specified value (2), the implementation MUST apply a strategy similar
   to attribute discard [RFC7606] by discarding the erroneous community
   and logging the error for further analysis.

   By default, implementations MUST drop the origin validation state
   extended community if received from an EBGP External BGP (EBGP) peer,
   without further processing it. it further.  Similarly, by default default, an
   implementation SHOULD NOT send the community to EBGP peers.  However  However,
   it SHOULD be possible to configure an implementation to send or
   accept the community when warranted.  An example of a case where the
   community would reasonably be received from, or sent to, an EBGP peer
   is when two adjacent ASes are under control of the same
   administration.  A second example is documented in [I-D.ietf-sidr-route-server-rpki-light]. [SIDR-RPKI].

3.  Deployment Considerations

   In deployment scenarios where in which not all the speakers in an
   autonomous system are upgraded to support the extensions defined in
   this document, it is necessary to define policies that match on the
   origin validation extended community and set another BGP attribute
   [RFC6811] that influences selection of the best path selection in the same way as what would
   have been enabled by
   that an implementation implementaion of this extension.

5. extension would.

4.  IANA Considerations

   IANA has assigned registered the value 0x00 from 0x00, with the name "BGP Origin
   Validation State Extended Community", in the "Non-Transitive Opaque
   Extended Community Sub-Types" registry.  The value is called "BGP
   Origin Validation State Extended Community".

6.

5.  Security Considerations

   Security considerations such as those described in [RFC4272] continue
   to apply.  Since  Because this document introduces an extended community
   that will generally be used to affect route selection, the analysis
   in Section 4.5 ("Falsification") of [RFC4593] is relevant.  These
   issues are neither new, new nor unique to the origin validation extended
   community.

   The security considerations provided in [RFC6811] apply equally to
   this application of origin validation.  In addition, this document
   describes a scheme where router A outsources validation to some
   router B.  If this scheme is used, the participating routers should
   have the appropriate trust relationship -- B should trust A either
   because they are under the same administrative control or for some
   other reason (for example, consider
   [I-D.ietf-sidr-route-server-rpki-light]). [SIDR-RPKI]).  The security
   properties of the propagation path TCP connection between the two routers should also
   be considered.  See [RFC7454] Section 5.1 of [RFC7454] for advice regarding
   protection of the propagation path.

7. TCP connection.

6.  References

7.1.

6.1.  Normative References

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

   [RFC4271]  Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
              Border Gateway Protocol 4 (BGP-4)", RFC 4271,
              DOI 10.17487/RFC4271, January 2006,
              <http://www.rfc-editor.org/info/rfc4271>.

   [RFC4360]  Sangli, S., Tappan, D., and Y. Rekhter, "BGP Extended
              Communities Attribute", RFC 4360, DOI 10.17487/RFC4360,
              February 2006, <http://www.rfc-editor.org/info/rfc4360>.

   [RFC6811]  Mohapatra, P., Scudder, J., Ward, D., Bush, R., and R.
              Austein, "BGP Prefix Origin Validation", RFC 6811,
              DOI 10.17487/RFC6811, January 2013,
              <http://www.rfc-editor.org/info/rfc6811>.

7.2.

6.2.  Informative References

   [I-D.ietf-sidr-route-server-rpki-light]
              King, T., Kopp, D., Lambrianidis, A., and A. Fenioux,
              "Signaling Prefix Origin Validation Results from a Route-
              Server to Peers", draft-ietf-sidr-route-server-rpki-
              light-01 (work in progress), December 2016.

   [RFC4272]  Murphy, S., "BGP Security Vulnerabilities Analysis",
              RFC 4272, DOI 10.17487/RFC4272, January 2006,
              <http://www.rfc-editor.org/info/rfc4272>.

   [RFC4593]  Barbir, A., Murphy, S., and Y. Yang, "Generic Threats to
              Routing Protocols", RFC 4593, DOI 10.17487/RFC4593,
              October 2006, <http://www.rfc-editor.org/info/rfc4593>.

   [RFC7454]  Durand, J., Pepelnjak, I., and G. Doering, "BGP Operations
              and Security", BCP 194, RFC 7454, DOI 10.17487/RFC7454,
              February 2015, <http://www.rfc-editor.org/info/rfc7454>.

   [RFC7606]  Chen, E., Ed., Scudder, J., Ed., Mohapatra, P., and K.
              Patel, "Revised Error Handling for BGP UPDATE Messages",
              RFC 7606, DOI 10.17487/RFC7606, August 2015,
              <http://www.rfc-editor.org/info/rfc7606>.

4.

   [SIDR-RPKI]
              King, T., Kopp, D., Lambrianidis, A., and A. Fenioux,
              "Signaling Prefix Origin Validation Results from a Route-
              Server to Peers", Work in Progress, draft-ietf-sidrops-
              route-server-rpki-light-01, January 2017.

Acknowledgements

   The authors would like to acknowledge the valuable review and
   suggestions from Wesley George, Roque Gagliano Gagliano, and Bruno Decraene on
   this document.

Authors' Addresses

   Pradosh Mohapatra
   Sproute Networks

   Email: mpradosh@yahoo.com

   Keyur Patel
   Cisco
   170 W. Tasman Drive
   San Jose, CA  95124
   Arrcus, Inc.

   Email: keyupate@cisco.com keyur@arrcus.com
   John Scudder
   Juniper Networks
   1194 N. Mathilda Ave
   Sunnyvale, CA  94089

   Email: jgs@juniper.net

   Dave Ward
   Cisco
   170 W. Tasman Drive
   San Jose, CA  95124

   Email: dward@cisco.com

   Randy Bush
   Internet Initiative Japan, Inc.
   5147 Crystal Springs
   Bainbridge Island, Washington WA  98110

   Email: randy@psg.com