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BGP OSPF Interaction (RFC1364)

IP.com Disclosure Number: IPCOM000002188D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 12 page(s) / 30K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Varadhan: AUTHOR

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.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 10% of the total text.

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

1. Introduction

This document defines the various criteria to be used when designing

Autonomous System Border Routers (ASBR) that will run BGP [RFC1267]

with other ASBRs external to the AS, and OSPF [RFC1247] as its IGP.

This document defines how the following fields in OSPF and attributes

in BGP are to be set when interfacing between BGP and OSPF at an

ASBR:

OSPF cost and type vs. BGP INTER-AS METRIC

OSPF tag vs. BGP ORIGIN and AS_PATH

OSPF Forwarding Address vs. BGP NEXT_HOP