Destination/Source Routing
draft-ietf-rtgwg-dst-src-routing-07
rtgwg D. Lamparter
Internet-Draft NetDEF
Intended status: Standards Track A. Smirnov
Expires: September 11, 2019 Cisco Systems, Inc.
March 10, 2019
Destination/Source Routing
draft-ietf-rtgwg-dst-src-routing-07
Abstract
This note specifies using packets' source addresses in route lookups
as additional qualifier to be used in hop-by-hop routing decisions.
This applies to IPv6 [RFC2460] in general with specific
considerations for routing protocol left for separate documents.
There is nothing precluding similar operation in IPv4, but this is
not in scope of this document.
Note that destination/source routing, source/destination routing,
SADR, source-specific routing, source-sensitive routing, S/D routing
and D/S routing are all used synonymously.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 11, 2019.
Copyright Notice
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document authors. All rights reserved.
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Provisions Relating to IETF Documents
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Use cases . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Multihomed networks with provider assigned prefixes . . . 4
2.2. Degree of traffic engineering . . . . . . . . . . . . . . 5
2.3. Distributed filtering based on source address . . . . . . 5
2.4. Walled-garden Enterprise services . . . . . . . . . . . . 5
2.5. Information Source for Neighbor Management . . . . . . . 6
3. Principle of operation . . . . . . . . . . . . . . . . . . . 6
3.1. Frame of reference . . . . . . . . . . . . . . . . . . . 6
3.2. Route information and equality . . . . . . . . . . . . . 6
3.3. Lookup ordering and disambiguation . . . . . . . . . . . 7
3.4. Ordering Rationale . . . . . . . . . . . . . . . . . . . 7
4. Routing protocol considerations . . . . . . . . . . . . . . . 8
4.1. Source information . . . . . . . . . . . . . . . . . . . 8
4.2. Loop-freeness considerations . . . . . . . . . . . . . . 8
4.3. Recursive routing . . . . . . . . . . . . . . . . . . . . 10
5. Applicability To Specific Situations . . . . . . . . . . . . 10
5.1. Recursive Route Lookups . . . . . . . . . . . . . . . . . 10
5.1.1. Recursive route expansion . . . . . . . . . . . . . . 11
5.2. Unicast Reverse Path Filtering . . . . . . . . . . . . . 12
5.3. Multicast Reverse Path Forwarding . . . . . . . . . . . . 12
5.4. Testing for Connectivity Availability . . . . . . . . . . 12
6. Interoperability . . . . . . . . . . . . . . . . . . . . . . 13
6.1. Interoperability in Distance-Vector Protocols . . . . . . 14
6.2. Interoperability in Link-State Protocols . . . . . . . . 15
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
8. Security Considerations . . . . . . . . . . . . . . . . . . . 15
9. Privacy Considerations . . . . . . . . . . . . . . . . . . . 16
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 16
11. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 16
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
12.1. Normative References . . . . . . . . . . . . . . . . . . 17
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