Ingress Replication Tunnels in Multicast VPN
draft-ietf-bess-ir-05

quot; functionality, the
   child node needs to continue to accept packets from the old UMH for a
   period of time.  After this period, it will discard any packets from
   the given IR P-tunnel that it receives from the old UMH, and will
   only accept such packets from the new UMH.

   Once the child node modifies the RT of its Leaf A-D route, it MUST
   run a timer (the "switch-parents-delay" timer).  This timer SHOULD
   default to 30 seconds, and SHOULD be configurable.  The child node
   MUST continue to accept packets of the given IR P-tunnel from the old
   UMH until the timer expires.  However, once the child node receives a
   packet of the given IR P-tunnel from the new UMH, it MAY consider the
   switch-parents-delay timer to have expired.

   The "parent-continues" timer MUST be longer than the "switch-parents-
   delay" timer.  Note that both timers are specific to a given IR
   P-tunnel.

11.  IANA Considerations

   This document contains no actions for IANA.

12.  Acknowledgments

   The authors wish to thank Yakov Rekhter for his contributions to this
   work.  We also wish to thank Huajin Jeng and Samir Saad for their
   contributions, and to thank Thomas Morin for pointing out (both
   before and after the document was written) some of the issues that
   needed further elaboration.  We also thank Lucy Yong for her review
   and comments.

   Section 7.1 discusses the importance of having an MPLS label
   allocation policy that, when ingress replication is used, allows an
   egress PE to infer the identity of a received packet's ingress PE.
   This issue was first raised in earlier work by Xu Xiaohu.

13.  Security Considerations

   No security considerations are raised by this document beyond those
   already discussed in [RFC6513] and [RFC6514].

14.  References

14.1.  Normative References

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   [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>.

   [RFC6513]  Rosen, E., Ed. and R. Aggarwal, Ed., "Multicast in MPLS/
              BGP IP VPNs", RFC 6513, DOI 10.17487/RFC6513, February
              2012, <http://www.rfc-editor.org/info/rfc6513>.

   [RFC6514]  Aggarwal, R., Rosen, E., Morin, T., and Y. Rekhter, "BGP
              Encodings and Procedures for Multicast in MPLS/BGP IP
              VPNs", RFC 6514, DOI 10.17487/RFC6514, February 2012,
              <http://www.rfc-editor.org/info/rfc6514>.

   [RFC6515]  Aggarwal, R. and E. Rosen, "IPv4 and IPv6 Infrastructure
              Addresses in BGP Updates for Multicast VPN", RFC 6515,
              DOI 10.17487/RFC6515, February 2012,
              <http://www.rfc-editor.org/info/rfc6515>.

14.2.  Informative References

   [RFC3209]  Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V.,
              and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP
              Tunnels", RFC 3209, DOI 10.17487/RFC3209, December 2001,
              <http://www.rfc-editor.org/info/rfc3209>.

   [RFC5036]  Andersson, L., Ed., Minei, I., Ed., and B. Thomas, Ed.,
              "LDP Specification", RFC 5036, DOI 10.17487/RFC5036,
              October 2007, <http://www.rfc-editor.org/info/rfc5036>.

   [RFC6388]  Wijnands, IJ., Ed., Minei, I., Ed., Kompella, K., and B.
              Thomas, "Label Distribution Protocol Extensions for Point-
              to-Multipoint and Multipoint-to-Multipoint Label Switched
              Paths", RFC 6388, DOI 10.17487/RFC6388, November 2011,
              <http://www.rfc-editor.org/info/rfc6388>.

   [RFC6625]  Rosen, E., Ed., Rekhter, Y., Ed., Hendrickx, W., and R.
              Qiu, "Wildcards in Multicast VPN Auto-Discovery Routes",
              RFC 6625, DOI 10.17487/RFC6625, May 2012,
              <http://www.rfc-editor.org/info/rfc6625>.

   [RFC7524]  Rekhter, Y., Rosen, E., Aggarwal, R., Morin, T.,
              Grosclaude, I., Leymann, N., and S. Saad, "Inter-Area
              Point-to-Multipoint (P2MP) Segmented Label Switched Paths
              (LSPs)", RFC 7524, DOI 10.17487/RFC7524, May 2015,
              <http://www.rfc-editor.org/info/rfc7524>.

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   [RFC7582]  Rosen, E., Wijnands, IJ., Cai, Y., and A. Boers,
              "Multicast Virtual Private Network (MVPN): Using
              Bidirectional P-Tunnels", RFC 7582, DOI 10.17487/RFC7582,
              July 2015, <http://www.rfc-editor.org/info/rfc7582>.

   [RFC7716]  Zhang, J., Giuliano, L., Rosen, E., Ed., Subramanian, K.,
              and D. Pacella, "Global Table Multicast with BGP Multicast
              VPN (BGP-MVPN) Procedures", RFC 7716,
              DOI 10.17487/RFC7716, December 2015,
              <http://www.rfc-editor.org/info/rfc7716>.

   [RFC7740]  Zhang, Z., Rekhter, Y., and A. Dolganow, "Simulating
              Partial Mesh of Multipoint-to-Multipoint (MP2MP) Provider
              Tunnels with Ingress Replication", RFC 7740,
              DOI 10.17487/RFC7740, January 2016,
              <http://www.rfc-editor.org/info/rfc7740>.

   [RFC7900]  Rekhter, Y., Ed., Rosen, E., Ed., Aggarwal, R., Cai, Y.,
              and T. Morin, "Extranet Multicast in BGP/IP MPLS VPNs",
              RFC 7900, DOI 10.17487/RFC7900, June 2016,
              <http://www.rfc-editor.org/info/rfc7900>.

Authors' Addresses

   Eric C. Rosen (editor)
   Juniper Networks, Inc.
   10 Technology Park Drive
   Westford, Massachusetts  01886
   United States

   Email: erosen@juniper.net

   Karthik Subramanian
   Sproute Networks

   Email: karthik@sproute.com

   Zhaohui Zhang
   Juniper Networks, Inc.
   10 Technology Park Drive
   Westford, Massachusetts  01886
   United States

   Email: zzhang@juniper.net

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