RFC 1745 (rfc1745) - Page 1 of 19

BGP4/IDRP for IP---OSPF Interaction

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Network Working Group                                       K.  Varadhan
Request for Comments: 1745                                  OARnet & ISI
Category: Standards Track                                       S. Hares
                                                            NSFnet/Merit
                                                              Y. Rekhter
                                  T.J. Watson Research Center, IBM Corp.
                                                           December 1994


                  BGP4/IDRP for IP---OSPF Interaction

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) 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 an
   Autonomous System Border Router (ASBR) that will run either BGP4 or
   IDRP for IP with other ASBRs external to the AS and OSPF as its IGP.

Table of Contents

   1.  Introduction .................................................  2
   2.  Reachability Information Exchange ............................  4
   2.1.  Exporting OSPF information into BGP/IDRP  ..................  4
   2.2.  Importing BGP/IDRP information into OSPF ...................  6
   3.  BGP/IDRP Identifier and OSPF router ID .......................  7
   4.  Setting OSPF tags, ORIGIN and PATH attributes ................  8
   4.1.  Configuration parameters for setting the OSPF tag .......... 10
   4.2.  Manually configured tags ................................... 10
   4.3.  Automatically generated tags ............................... 11
   4.3.1. Tag =  ...... 11
   4.3.2. Tag =  ...... 11
   4.3.3. Tag =  ...... 12
   4.3.4. Tag =  ...... 12
   4.3.5. Tag =  ...... 12
   4.3.6. Tag =  ...... 13
   4.4.  Miscellaneous tag settings ................................. 14
   5.  Setting OSPF Forwarding Address and BGP NEXT_HOP attribute ... 14
   6.  Changes from the BGP 3 - OSPF interactions document .......... 15
   7.  Security Considerations ...................................... 16
   8.  Acknowledgements ............................................. 16
   9.  Bibliography ................................................. 16



Varadhan, Hares & Rekhter
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