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ONF Configuration and Management WG

This overview covers the standardization of OpenFlow-based SDN through the Open Networking Foundation (ONF) and focuses on configuration management, the OF-CONFIG protocol, interoperability tests, hybrid networks, and more. Learn about the architecture, forwarding abstractions, and resource allocation within switches. The document details the establishment and evolution of OF-CONFIG versions, adoption of Netconf and XML, and ongoing discussions on protocol alternatives and event notifications. Explore the importance of bootstrapping OpenFlow networks, logical switch configurations, and the future focus on OAM and call home scenarios within the network.

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ONF Configuration and Management WG

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  1. ONF Configuration and Management WG Jürgen Quittek quittek@neclab.eu

  2. ONF Overview • Open Networking Foundation • Standardizing OpenFlow-based SDN • http://opennetworkingfoundation.org • Working groups • Extensibility OpenFlow: wire protocol, extensibility, features ,… (OF 1.x) • Config-mgmt Protocol & schema for configuration of a switch (OF-Config 1.x) • Testing-interop Interoperability tests, plug-fests; performance benchmarking • Hybrid OpenFlow in legacy networks; hybrid switches, hybrid networks • Architecture SDN architecture based on OpenFlow • Forwarding Abstractions Table Typing, Forwarding plane models

  3. Config & Mgmt. WG:Problem statement • Bootstrap OpenFlow network • Switch connects to controller • Controller(s) to connect to must be configured at switches • Allocate resources within switches • Ports • Queues • . . . switch switch switch switch controller controller

  4. Reference Model • Configuration Point • Source of switch configuration • OpenFlow Capable Switch • Hosts one or more logical switches • OpenFlow Controller • OpenFlow Logical Switch • instance of an OpenFlow Switch Configuration Point Configuration Point Configuration Point Configuration Point OpenFlow Controller OpenFlow Controller using IETF Netconf & XML data models OF-CONFIG OpenFlow OpenFlow OpenFlow Capable Switch resources (ports, queues) OF Logical Switch OF Logical Switch

  5. OF-CONFIG scope and releases WG established in Sep 2011 • OF-CONFIG 1.0 (Jan 2012) based on OpenFlow 1.2 • assigning controllers to logical switches • retrieving assignment of resources to logical switches • configuring some properties of ports and queues • OF-CONFIG 1.1 (Apr 2012) based on OpenFlow 1.3 • added controller certificates and resource type "table" • retrieving logical switch capabilities signaled to controller • configuring of tunnel endpoints • OF-CONFIG 1.1.1 (Aug 2012) based on OpenFlow 1.3.1 • consolidation of version 1.1, fixing small inconsistencies • OF-CONFIG 1.2 (early 2013) based on OpenFlow 1.3.1 • features still under discussion, candidates include • retrieving capable switch capabilities, configuring logical switch capab. • assigning resources to logical switches • simple topology detection • event notification

  6. Use of Netconf and Yang • Netconf was chosen as management protocol • not necessarily accepted as ideal solution • still discussing alternatives • XML schema was chosen as modeling language • Yang is also used, but XML is normative • normative XML schema generated from Yang code • So far, the focus has been on configuration • bootstrap of an OpenFlow network is the obvious first thing to do • New work items will be more on OAM • incl. event notifications

  7. Call home issue • In the OF-CONFIG spec the primary scenario is using Netconf with connections initiated by the configuration point • However, several members asked for also supporting call home sceanrios with switch initiating Netconf connections • switch configured with DHCP • receives own address and configuration point's address • no need to manually add switch to configuration point's DB • OF-CONFIG document states: use BEEP if you need switch-initiated connections • now, BEEP is getting "historic" • Options: • drop call home scenario • ask ITEF to further support call home

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