Browse Definitions :
Definition

northbound interface / southbound interface

Contributor(s): Stan Gibilisco

A northbound interface is an interface that allows a particular component of a network to communicate with a higher-level component. Conversely, a southbound interface allows a particular network component to communicate with a lower-level component.

In a figurative sense, northbound flow can be thought of as going upward, while southbound flow can be thought of as going downward. In architectural diagrams, northbound interfaces are drawn at the top of the applicable component, while southbound interfaces are drawn at the bottom of the component. While the terms northbound and southbound can apply to almost any type of network or computer system, in recent years they have been used increasingly in conjunction with application program interfaces (APIs) in software-defined networking (SDN).

In SDN, the southbound interface is the OpenFlow (or alternative) protocol specification. Its main function is to enable communication between the SDN controller and the network nodes (both physical and virtual switches and routers) so that the router can discover network topology, define network flows and implement requests relayed to it via northbound APIs. The northbound interface describes the area of protocol-supported communication between the controller and applications or higher layer control programs.

In an enterprise data center, functions of northbound APIs include management solutions for automation and orchestration, and the sharing of actionable data between systems. Functions of southbound APIs include communication with the switch fabric, network virtualization protocols, or the integration of a distributed computing network.

This was last updated in November 2012

Continue Reading About northbound interface / southbound interface

Join the conversation

1 comment

Send me notifications when other members comment.

Please create a username to comment.

Yes
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • data governance policy

    A data governance policy is a documented set of guidelines for ensuring that an organization's data and information assets are ...

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

  • compliance as a service (CaaS)

    Compliance as a Service (CaaS) is a cloud service service level agreement (SLA) that specified how a managed service provider (...

SearchSecurity

  • intrusion detection system (IDS)

    An intrusion detection system (IDS) is a system that monitors network traffic for suspicious activity and alerts when such ...

  • Secure Shell (SSH)

    SSH, also known as Secure Shell or Secure Socket Shell, is a network protocol that gives users, particularly system ...

  • intrusion prevention system (IPS)

    An intrusion prevention system (IPS) is a network security and threat prevention tool.

SearchHealthIT

SearchDisasterRecovery

SearchStorage

  • cache memory

    Cache memory, also called CPU memory, is high-speed static random access memory (SRAM) that a computer microprocessor can access ...

  • capacity management

    Capacity management is the broad term describing a variety of IT monitoring, administration and planning actions that are taken ...

  • cloud storage

    Cloud storage is a service model in which data is transmitted and stored on remote storage systems, where it is maintained, ...

Close