The first step in using any network device involves installing the hardware and software necessary for its operation. Devices that run the Junos OS vary in size and shape from very small (switches with only a few ports that run on regular office current) to massive large (multi-rack core routers that require multiple experienced installer and mechanical lifts).
Nevertheless, some general rules are valid for hardware installation of Junos devices of all sizes. For illustration purposes, installation instructions for the small MX80 and the large MX960 are covered here.
Install a Juniper MX80 switch
After you have read the instructions, cleared the site, and assembled the necessary safety equipment for the size of device you are installing, you are ready to install the hardware. Note, however, that the details for doing so vary depending on the size of the chassis. For example, the MX80 is compact and weighs only about 30 pounds, whereas the MX960 is much heavier (up to 350 pounds).
Here is the procedure you follow to install the hardware for the smaller MX80:
Follow the device-specific site preparation checklist.
Review the safety guidelines.
Unpack the router and verify the parts received.
Install the mounting hardware.
Lift the router into the rack and secure the brackets (usually, two people can do this with ease).
Connect the grounding cables.
Turn on the router (most smaller Junos OS devices have power cords and plugs).
Perform initial software configuration (which is the same as for all Junos OS devices).
Install a Juniper MX960 router
The installation for a large router, in this case the MX960, is similar to smaller routers like the MX80 but differs in the details. Be sure the steps you follow are the correct ones for the specific device you are using.
To install the hardware for the MX960, you follow the same steps as you did for the MX80, but you use a mechanical lift to position the router in the rack and secure the mounting hardware. Then you do the following:
Connect the grounding cables.
Connect power to the router (larger Junos OS devices have direct AC or DC connections).
Perform initial software configuration (which is the same as for all Junos OS devices).
Default software installed on Juniper devices
When your device is shipped, a basic factory-default configuration of Junos OS is installed on the device. The content of the factory-default configuration file may vary across the Junos OS product families, but they all have a factory-default configuration:
M, T, and MX routers: The factory-default configurations for these routers include only a root user account and simple logging settings.
EX switches: The factory-default configuration for EX switches is more elaborate. On EX switches, all ports are in Layer 2 mode, and the Rapid Spanning Tree Protocol (RSTP) and Link Layer Discovery Protocol (LLDP) are enabled, as well as Power over Ethernet (PoE).
SRX Services Gateways: The factory-default configuration for SRX Services Gateways changes with the model. Smaller SRX devices have Layer 2 and Layer 3 ports, but larger SRXs all have Layer 3 ports. Dynamic Host Configuration Protocol (DHCP) is enabled, and an IP address is configured for management purposes on some SRX devices. But, as expected for security devices, all SRXs have rudimentary security policies in place.
Therefore, you must configure Junos OS software to work with your specific network.
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Source:http://www.dummies.com/how-to/content/how-to-install-juniper-network-devices-in-a-rack.html
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