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For the Austrian liberal youth organization, see JUNOS – Young liberal NEOS. For the Canadian music awards, see Juno Award.
Junos sw logo.jpg
Developer Juniper Networks
Working state Current
Source model Closed source and partly Open source
Initial release July 7, 1998; 17 years ago (1998-07-07)
Latest release 15.1R1 / June 4, 2015; 5 months ago (2015-06-04)
Available in English
Platforms Juniper Networks routers
Default user interface Command-line interface
License FreeBSD-based but commercial & proprietary[1]
Official website www.juniper.net/products-services/nos/junos/
Simplified history of Unix-like operating systems. Linux shares similar architecture and concepts (as part of the POSIX standard) but does not share non-free source code with the original Unix or MINIX. Not shown are Junos, PS3 OS, Orbis OS and other proprietary forks.

Juniper Junos is the FreeBSD-based operating system used in Juniper Networks hardware routers.[2] It is an operating system that is used in Juniper's routing, switching and security devices. Juniper offers a Software Development Kit (SDK) to partners and customers to allow additional customization.[2][3] The biggest competitor of Junos is Cisco Systems' IOS.[4][needs update]


Junos provides a single code base across most of Juniper's platforms. Juniper has issued a new release of Junos every 90 days since 1998.[5][6][7][needs update]


  • Routing: Juniper Networks IP routing expertise delivers a full complement of routing protocols.
  • Modularity: Junos software has a modular software design.
  • Security: With the introduction of the SRX and J-series (past version 9.3) platforms, support for flow mode has been added to Junos, which includes stateful firewalling, NAT, and IPSec.
  • Policy and control: Junos supports a flexible routing policy language that is used for controlling route advertisements and path selection
  • Standards-based: Junos adheres to industry standards[citation needed] for routing, MPLS, and high availability mechanisms such as Graceful Restart


Junos operating system is primarily based on FreeBSD,[8] an advantage of which is the Unix-like environment: customers can access a Unix shell and execute normal Unix commands. Junos is platform independent within Juniper hardware systems.[9] After Juniper acquired NetScreen, it also integrated ScreenOS security functions into its own Junos network operating system so that now Juniper offers routing and security functions in a single device.[10]

Junos Command Line Interface (CLI)[edit]

The Junos CLI is a text-based command interface for configuring, troubleshooting, and monitoring the Juniper device and network traffic associated with it. It supports two types of command modes.

  • Operational Mode
  • Configuration Mode

The functions of Operational Mode include control of the CLI environment, monitoring of hardware status, and display of information about network data that passes though or into the hardware. The Configuration mode is used for configuring the Juniper router, switch, or security device, by adding, deleting, or modifying statements in the configuration hierarchy.

Junos SDK[edit]

Through the Juniper Developer Network (JDN)[11] Juniper Networks provides the Junos SDK[12] to its customers and 3rd-party developers who want to develop applications for Junos-powered devices such as Juniper Networks routers, switches, and service gateway systems.[13][14][15][16][17] It provides a set of tools and application programming interfaces (APIs), including interfaces to Junos routing, firewall filter, UI and traffic services functions. Juniper Networks also employs the Junos SDK internally to develop parts of Junos and many Junos applications such as OpenFlow for Junos, and other traffic services.

Market share[edit]

Juniper as of June 13, 2008 had 5 percent of the $4.2 billion enterprise-router market, 18 percent of the $4.7 billion service-provider edge-router market and 30 percent of the $2.7 billion service-provider core-router market, according to the Dell'Oro Group.[18]


  1. ^ "JunOS 9.5 Licensing". Retrieved 2013-04-17. 
  2. ^ a b "JUNOS Software: Network Operating System". Retrieved 2008-11-10.  Cite error: Invalid <ref> tag; name "juniper.net" defined multiple times with different content (see the help page).
  3. ^ "Juniper created the Open IP Solution Development Program (OSDP) to allow customers and partners access to the Partner Solution Development Platform (PSDP), which includes a Software Development Kit (SDK) with intelligent and secure interfaces to JUNOS". Retrieved 2008-11-10. 
  4. ^ "Cisco's IOS vs. Juniper's Junos". 2008-04-17. Retrieved 2008-11-10.  |first1= missing |last1= in Authors list (help)
  5. ^ "JUNOS: Open, But Not Open Source". Retrieved 2008-11-10.  |first1= missing |last1= in Authors list (help)
  6. ^ "The first version of Junos was available on 7 July 1998 and since then Juniper has been updating it with new features every quarter. The release of JUNOS 9.1 in May this year was the 38th consecutive release.". Retrieved 2008-11-12. 
  7. ^ "Juniper has updated Junos every 90 days since 1998.Every 90 days there is a new release providing fixes and improving functionality". Retrieved 2008-11-12. 
  8. ^ "Juniper’s JUNOS FreeBSD based router operating system". Retrieved 2008-11-12.  |first1= missing |last1= in Authors list (help)
  9. ^ "Junos Software Features :". Retrieved 2008-11-10. 
  10. ^ "Juniper at Last Integrates NetScreenOS into JUNOS". 2008-03-17. Retrieved 2008-11-10.  |first1= missing |last1= in Authors list (help)
  11. ^ "Juniper Developer Network". Retrieved 2012-05-30. 
  12. ^ "Junos SDK". Retrieved 2012-05-30. 
  13. ^ "Rapid Service Creation Using the Junos SDK" (PDF). Retrieved 2012-05-30. 
  14. ^ "Juniper Opens Router OS to Third-Party Developers". 2007-12-10. Retrieved 2008-11-10.  |first1= missing |last1= in Authors list (help)
  15. ^ "JUNOS PSDP". Retrieved 2008-11-10. 
  16. ^ "Juniper Accelerates Innovation with the Partner Solution Development Platform (PSDP)" (PDF). Retrieved 2008-11-10. 
  17. ^ "Executive Essays on Innovation and the Partner Solution" (PDF). Archived from the original (PDF) on 2008-07-27. Retrieved 2008-11-10. 
  18. ^ "The battle between Junos and IOS". 04/17/08. Retrieved 2008-11-12.  |first1= missing |last1= in Authors list (help); Check date values in: |date= (help)

External links[edit]