RFC 1364 (rfc1364) - Page 1 of 14

BGP OSPF Interaction

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Network Working Group                                        K. Varadhan
Request for Comments: 1364                                        OARnet
                                                          September 1992


                          BGP OSPF Interaction

Status of this Memo

   This RFC specifies an IAB standards track protocol for the Internet
   community, and requests discussion and suggestions for improvements.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

Abstract

   This memo defines the various criteria to be used when designing
   Autonomous System Border Routers (ASBR) that will run BGP with other
   ASBRs external to the AS and OSPF as its IGP.

Table of Contents

   1.  Introduction .................................................  2
   2.  Route Exchange ...............................................  2
   2.1.  Exporting OSPF routes into BGP .............................  3
   2.2.  Importing BGP routes into OSPF .............................  4
   3.  BGP Identifier and OSPF router ID ............................  5
   4.  Setting OSPF tags, BGP ORIGIN and AS_PATH attributes .........  5
   4.1.  Semantics of the characteristics bits ......................  7
   4.2.  Configuration parameters for setting the OSPF tag ..........  8
   4.3.  Manually configured tags ...................................  9
   4.4.  Automatically generated tags ................................ 9
   4.4.1.  Routes with incomplete path information, pl = 0 ........... 9
   4.4.2.  Routes with incomplete path information, pl = 1 ........... 9
   4.4.3.  Routes with incomplete path information, pl >= 1 ..........10
   4.4.4.  Routes with complete path information, pl = 0 .............10
   4.4.5.  Routes with complete path information, pl = 1 .............11
   4.4.6.  Routes with complete path information, pl >= 1 ............11
   4.5.  Miscellaneous tag settings ..................................12
   4.6.  Summary of the TagType field setting ........................12
   5.  Setting OSPF Forwarding Address and BGP NEXT_HOP attribute ....12
   6.  Security Considerations .......................................13
   7.  Acknowledgements ..............................................13
   8.  Bibliography ..................................................14
   9.  Author's Address ..............................................14





Varadhan
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