Carrying next-hop cost information in BGP
draft-ietf-idr-bgp-nh-cost-02

 
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Internet Engineering Task Force                            I. Varlashkin
Internet-Draft                                                    Google
Intended status: Standards Track                               R. Raszuk
Expires: November 16, 2015                                 Mirantis Inc.
                                                                K. Patel
                                                             M. Bhardwaj
                                                            S. Bayraktar
                                                           Cisco Systems
                                                            May 15, 2015

               Carrying next-hop cost information in BGP
                     draft-ietf-idr-bgp-nh-cost-02

Abstract

   BGPLS provides a mechanism by which Link state and traffic
   engineering information can be collected from internal networks and
   shared with external network routers using BGP.  BGPLS defines a new
   Address Family to exchange this information using BGP.

   BGP Optimal Route Reflection (ORR) provides a mechanism for a
   centralized BGP Route Reflector to acheive requirements of a Hot
   Potato Routing as described in Section 11 of [RFC4456].  Optimal
   Route Reflection requires BGP ORR to overwrite the default IGP
   location placement of the route reflector; which is used for
   determining cost to the nexthop contained in the path.

   This draft augments BGPLS and defines a new extensions to exchange
   cost information to next-hops for the purpose of calculating best
   path from a peer perspective rather than local BGP speaker own
   perspective.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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Varlashkin, et al.      Expires November 16, 2015               [Page 1]
Internet-Draft         draft-ietf-idr-bgp-nh-cost               May 2015

   This Internet-Draft will expire on November 16, 2015.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  NEXT-HOP INFORMATION BASE . . . . . . . . . . . . . . . . . .   3
   3.  BGP Bestpath Selection Modification . . . . . . . . . . . . .   4
   4.  BGPLS Extensions  . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  RIB Metrics Prefix Descriptor . . . . . . . . . . . . . .   4
     4.2.  RIB Protocol ID . . . . . . . . . . . . . . . . . . . . .   4
     4.3.  Information Exchange  . . . . . . . . . . . . . . . . . .   5
     4.4.  Termination of the session carrying next-hop cost . . . .   5
     4.5.  Graceful Restart and Route-Refresh  . . . . . . . . . . .   5
   5.  Security considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Appendix A.  USAGE SCENARIOS  . . . . . . . . . . . . . . . . . .   7
     A.1.  Trivial case  . . . . . . . . . . . . . . . . . . . . . .   7
     A.2.  Non-IGP based cost  . . . . . . . . . . . . . . . . . . .   7
     A.3.  Multiple route-reflectors . . . . . . . . . . . . . . . .   8
     A.4.  Inter-AS MPLS VPN . . . . . . . . . . . . . . . . . . . .   8
     A.5.  Corner case . . . . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9
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