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JunosToday Juniper have a number of networking devices that cater for the very smallest of businesses through to the largest service providers. Most of these devices run the flagship Junos operating system which provides a single operating system that is used to support products that deliver, Ethernet Switching, Routing and Security based solutions. Juniper have separated the above solutions and built certification streams that are industry recognised. To learn more about which stream is applicable to you follow one of the links below. You will be taken to our dedicated purpose-built site designed to assist engineers in understanding the different streams.
Market Leader: 4th Generation Operating System Cisco's over 20 year leadership position in routing business has been challenged by Juniper over the last 12 years. Juniper has dramatically cut Cisco's share of the service provider router market holding the number 1 position in carrier routing. Recently Juniper was identified as the next vendor to watch in the enterprise market with it's flagship carrier based Junos operating system now shipping on enterprise based products delivering more standard features and options in one version of software. JUNOS has a modular operating system. The Junos kernel is based on the open source FreeBSD operating system, and processes that run as modules on top of the kernel are segregated in exclusive, protected, memory space. Users thus can add features and functions to the version of JUNOS running on their systems without disabling or rebooting the entire operating system. Architecture Junos operating system is primarily based on the FreeBSD kernel, the 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. 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 knows as the SRX firewall. Versioning 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. The current version is easily calculated by the year number followed by the yearly quarter in which you are in. For example year 2010 fourth quarter would be 10.4. Note that the quarterly release of software is in the middle of the quarter and not at the start. Features
Junos Command Line Interface (CLI) 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.
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. Each time you enter configuration mode you take a copy of the live active configuration. When you make changes they are not activated until you type the "commit" command, and therefore you can make many changes essentially offline without changing the behavior of the device until you're ready. When it comes time to make changes you simply type commit and proceed to test the new configuration. If at anytime you need to quickly revert to the previous configuration you can by simply using the "rollback n" command selecting any 1 of 50 previous configurations without having to reboot the device. Junos Training Path Starting out with Junos can not be as straight forward for an experienced Cisco engineer as some concepts are going to be very different and therefore it will be hard to break old habits and concepts. As Juniper now use the same operating system across its carrier and enterprise products there are a few points of entry into Junos which lead to more specialised courses. Juniper is now moving to a modular course structure trying to remove as many overlaps in course curriculum as possible. To start with Junos it would be advisable to attend the 1 day "Introduction to the Junos Operating System" - IJOS course which initially was introduced as an Enterprise based JUNOS course. There are other options but it might be best to contact someone at Crystal Echo and state what platform you plan to configure along with some brief details about the topology and your level of current experience.
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