RFC 1403 (rfc1403) - Page 1 of 17
BGP OSPF Interaction
Alternative Format: Original Text Document
Network Working Group K. Varadhan
Request for Comments: 1403 OARnet
Obsoletes: 1364 January 1993
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 an
Autonomous System Border Routers (ASBR) that will run BGP with other
ASBRs external to the AS and OSPF as its IGP. This is a
republication of RFC 1364 to correct some editorial problems.
Table of Contents
1. Introduction .................................................... 2
2. Route Exchange .................................................. 3
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 ............ 6
4.1. Semantics of the characteristics bits ......................... 8
4.2. Configuration parameters for setting the OSPF tag ............. 9
4.3. Manually configured tags ...................................... 10
4.4. Automatically generated tags .................................. 10
4.4.1. Routes with incomplete path information, PathLength = 0 ..... 10
4.4.2. Routes with incomplete path information, PathLength = 1 ..... 11
4.4.3. Routes with incomplete path information, PathLength >= 1 .... 11
4.4.4. Routes with complete path information, PathLength = 0 ....... 12
4.4.5. Routes with complete path information, PathLength = 1 ....... 12
4.4.6. Routes with complete path information, PathLength >= 1 ...... 13
4.5. Miscellaneous tag settings .................................... 13
4.6. Summary of the TagType field setting .......................... 14
5. Setting OSPF Forwarding Address and BGP NEXT_HOP attribute ...... 14
6. Security Considerations ......................................... 15
7. Acknowledgements ................................................ 15
8. Bibliography .................................................... 16
9. Author's Address ................................................ 17
Varadhan
