SPRING Problem Statement and Requirements

The information below is for an old version of the document
Document Type Expired Internet-Draft (spring WG)
Authors Stefano Previdi  , Clarence Filsfils  , Bruno Decraene  , Stephane Litkowski  , Martin Horneffer  , Rob Shakir 
Last updated 2015-04-26 (latest revision 2014-10-23)
Replaces draft-previdi-spring-problem-statement
Stream Internet Engineering Task Force (IETF)
Expired & archived
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Stream WG state In WG Last Call
Document shepherd Alvaro Retana
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The ability for a node to specify a forwarding path, other than the normal shortest path, that a particular packet will traverse, benefits a number of network functions. Source-based routing mechanisms have previously been specified for network protocols, but have not seen widespread adoption. In this context, the term 'source' means 'the point at which the explicit route is imposed'. This document outlines various use cases, with their requirements, that need to be taken into account by the Source Packet Routing in Networking (SPRING) architecture for unicast traffic. Multicast use- cases and requirements are out of scope of this document.


Stefano Previdi (sprevidi@cisco.com)
Clarence Filsfils (cfilsfil@cisco.com)
Bruno Decraene (bruno.decraene@orange.com)
Stephane Litkowski (stephane.litkowski@orange.com)
Martin Horneffer (Martin.Horneffer@telekom.de)
Rob Shakir (rob.shakir@bt.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)