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RIFT: Routing in Fat Trees

Document Type Replaced Internet-Draft (rift WG)
Authors Tony Przygienda , Alankar Sharma , Alia Atlas , John Drake
Last updated 2018-04-10 (Latest revision 2018-03-01)
Replaced by draft-ietf-rift-rift
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
Stream WG state Candidate for WG Adoption
Document shepherd (None)
IESG IESG state Replaced by draft-ietf-rift-rift
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document outlines a specialized, dynamic routing protocol for Clos and fat-tree network topologies. The protocol (1) deals with automatic construction of fat-tree topologies based on detection of links, (2) minimizes the amount of routing state held at each level, (3) automatically prunes the topology distribution exchanges to a sufficient subset of links, (4) supports automatic disaggregation of prefixes on link and node failures to prevent black-holing and suboptimal routing, (5) allows traffic steering and re-routing policies, (6) allows non-ECMP forwarding, (7) automatically re- balances traffic towards the spines based on bandwidth available and ultimately (8) provides mechanisms to synchronize a limited key-value data-store that can be used after protocol convergence to e.g. bootstrap higher levels of functionality on nodes.


Tony Przygienda
Alankar Sharma
Alia Atlas
John Drake

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