BGP4/IDRP for IP---OSPF Interaction
RFC 1745
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RFC - Historic
(December 1994; No errata)
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2013-03-02
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RFC 1745 (Historic)
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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 = <Automatic = 1, Complete = 0, PathLength = 00> ...... 11
4.3.2. Tag = <Automatic = 1, Complete = 0, PathLength = 01> ...... 11
4.3.3. Tag = <Automatic = 1, Complete = 0, PathLength = 10> ...... 12
4.3.4. Tag = <Automatic = 1, Complete = 1, PathLength = 00> ...... 12
4.3.5. Tag = <Automatic = 1, Complete = 1, PathLength = 01> ...... 12
4.3.6. Tag = <Automatic = 1, Complete = 1, PathLength = 10> ...... 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 [Page 1]
RFC 1745 BGP4/IDRP for IP - OSPF Interaction December 1994
10. Appendix .................................................... 18
11. Authors' Present Addresses .................................. 19
1. Introduction
This document defines the various criteria to be used when designing
an Autonomous System Border Router (ASBR) that will run BGP4
[RFC1654] or IDRP for IP [IDRP] with other ASBRs external to the AS,
and OSPF [RFC1583] as its IGP.
All future references of BGP in this document will refer to BGP
version 4, as defined in [RFC1654]. All reference to IDRP are
references to the Inter-Domain Routing Protocol (ISO 10747) which has
been defined by the IDRP for IP document [IDRP] for use in Autonomous
Systems.
This document defines how the following fields in OSPF and attributes
in BGP/IDRP are to be set when interfacing between BGP/IDRP and OSPF
at an ASBR:
IDRP came out of the same work as BGP, and may be consider a follow
on to BGP-3 and BGP-4. Most fields defined in the interaction
between BGP and IDRP are named the same. Where different, the IDRP
fields are shown separately.
BGP/IDRP MULTI_EXIT_DISC
BGP ORIGIN and AS_PATH/AS_SET vs. OSPF tag
IDRP EXT_INFO and RD_PATH/RD_SET
BGP/IDRP NEXT_HOP vs. OSPF Forwarding Address
BGP/IDRP LOCAL_PREF vs. OSPF cost and type
IDRP contains RD_PATH and RD_SET fields which serves the same purpose
as AS_PATH and AS_SET fields for IDRP for IP. In this document, we
will use the terms PATH and SET to refer to the BGP AS_PATH and
AS_SET, or the IDRP RD_PATH and RD_SET fields respectively, depending
on the context of the protocol being used.
Both IDRP and BGP provide a mechanism to indicate whether the routing
information was originated via an IGP, or some other means. In IDRP,
if route information is originated by means other than an IGP, then
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