Hiding Transit-Only Networks in OSPF
RFC 6860
| Document | Type | RFC - Proposed Standard (January 2013; Errata) | |
|---|---|---|---|
| Authors | Yi Yang , Alvaro Retana , Abhay Roy | ||
| Last updated | 2020-01-21 | ||
| Stream | Internent Engineering Task Force (IETF) | ||
| Formats | plain text html pdf htmlized (tools) htmlized with errata bibtex | ||
| Reviews | |||
| Stream | WG state | WG Document | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6860 (Proposed Standard) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Stewart Bryant | ||
| IESG note | Acee Lindem (acee.lindem@ericsson.com) is the document shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) Y. Yang
Request for Comments: 6860 A. Retana
Updates: 2328, 5340 A. Roy
Category: Standards Track Cisco Systems, Inc.
ISSN: 2070-1721 January 2013
Hiding Transit-Only Networks in OSPF
Abstract
A transit-only network is defined as a network connecting routers
only. In OSPF, transit-only networks are usually configured with
routable IP addresses, which are advertised in Link State
Advertisements (LSAs) but are not needed for data traffic. In
addition, remote attacks can be launched against routers by sending
packets to these transit-only networks. This document presents a
mechanism to hide transit-only networks to speed up network
convergence and reduce vulnerability to remote attacks.
In the context of this document, 'hiding' implies that the prefixes
are not installed in the routing tables on OSPF routers. In some
cases, IP addresses may still be visible when using OSPFv2.
This document updates RFCs 2328 and 5340.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6860.
Yang, et al. Standards Track [Page 1]
RFC 6860 Hiding Transit-Only Networks in OSPF January 2013
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................3
1.1. Requirements Notation ......................................3
2. Hiding IPv4 Transit-Only Networks in OSPFv2 .....................3
2.1. Point-to-Point Networks ....................................3
2.1.1. Advertising Point-to-Point Networks .................4
2.1.2. Hiding Point-to-Point Networks ......................4
2.2. Broadcast Networks .........................................5
2.2.1. Advertising Broadcast Networks ......................5
2.2.2. Hiding Broadcast Networks ...........................5
2.2.2.1. Sending Network-LSA ........................5
2.2.2.2. Receiving Network-LSA ......................6
2.2.2.2.1. Backward Compatibility ..........6
2.3. Non-Broadcast Networks .....................................7
2.3.1. NBMA ................................................7
2.3.2. Point-to-Multipoint .................................7
2.3.2.1. Advertising Point-to-Multipoint Networks ...7
2.3.2.2. Hiding Point-to-Multipoint Networks ........8
3. Hiding IPv6 Transit-Only Networks in OSPFv3 .....................9
3.1. Hiding AF-Enabled Transit-Only Networks in OSPFv3 ..........9
4. Operational Considerations ......................................9
4.1. Forwarding Address ........................................10
4.2. Virtual Links .............................................10
4.3. Unnumbered Interfaces .....................................10
5. Security Considerations ........................................11
6. Acknowledgments ................................................11
7. References .....................................................12
7.1. Normative References ......................................12
7.2. Informative References ....................................12
Yang, et al. Standards Track [Page 2]
RFC 6860 Hiding Transit-Only Networks in OSPF January 2013
1. Introduction
A transit-only network is defined as a network connecting routers
only. In OSPF, transit-only networks are usually configured with
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