Juniper EX9251 Quick Start

EX9251 Switch Quick Start
See the complete EX Series documentation at
http://www.juniper.net/documentation/.
To install the Juniper Networks EX9251 Ethernet Switch
on a rack, you need:
Two front-mounting brackets and 16 screws to secure
the brackets to the chassis—provided
Two rear-mounting brackets—provided
Eight screws to secure the switch to the rack—not
provided
Phillips (+) screwdriver, number 2—not provided
Electrostatic discharge (ESD) wrist strap with
cable—provided
To connect the switch to earth ground, you need:
A grounding cable (minimum 12 AWG (2.5 mm²), minimum 60°C wire or as permitted
by local code)—not provided
A grounding lug (Panduit LCD10-10A-L or equivalent)—not provided
A pair of 10-32 screws—provided
To connect AC power to the switch, you need:
An AC power supply installed in the switch—provided
An AC power cord with a plug appropriate for your geographical location—provided
A power cord retainer—provided
To connect DC power to the switch, you need:
A DC power supply installed in the switch—provided
Two DC power source cables (minimum 12 AWG (2.5 mm²), minimum 60°C wire or as
permitted by local code)—not provided
Two ring lugs (Molex 01907000969 or equivalent)—provided
To perform initial configuration of the switch, you need:
An Ethernet cable with an RJ-45 connector attached—provided
An RJ-45 to DB-9 serial port adapter—provided
A management host, such as a PC, with an Ethernet port—not provided
Register product serial numbers on the Juniper Networks website and update the
installation base data if there is any addition or change to the installation base or if the
installation base is moved. Juniper Networks will not be held accountable for not meeting
the hardware replacement service-level agreement for products that do not have
registered serial numbers or accurate installation base data.
Register your product(s) at https://tools.juniper.net/svcreg/SRegSerialNum.jsp.
Update your install base at
https://www.juniper.net/customers/csc/management/updateinstallbase.jsp.
The fan trays and power supplies in EX9251 switches are hot-removable and
hot-insertable field-replaceable units installed in the rear panel of the switch. You can
replace them without powering off the switch or disrupting switch functions.
CAUTION: Do not mix AC and DC power supplies in the same switch.
WARNING: Ensure that you understand how to prevent ESD damage. Wrap and
fasten one end of an ESD wrist strap around your bare wrist, and connect the other
end of the strap to the ESD point on the switch.
Part 1: Mount the Switch
You can mount an EX9251 switch on four posts of a 19-in. rack or an ETSI rack. This
guide describes the procedure to mount the switch on a 19-in. rack.
Mounting an EX9251 switch requires one person to lift the switch and a second person to
install the mounting screws to secure the switch to the rack.
1. Place the rack in its permanent location, allowing adequate clearance for airflow and
maintenance, and secure it to the building structure.
NOTE: When mounting multiple units on a rack, mount the heaviest unit at the bottom
and mount the other units from the bottom to the top in decreasing order of weight.
2. Place the switch on a flat, stable surface.
3. Position the front-mounting brackets along the side panels of the chassis, aligning
them with the front panel.
4. Attach the mounting brackets to the chassis by using the screws provided and the
Phillips (+) number 2 screwdriver.
5. Have one person grasp both sides of the switch, lift the switch, and position it in the
rack, aligning the holes on the front-mounting brackets with the threaded holes on the
rack. Align the bottom hole in each front-mounting bracket with a hole in each post of
the rack, making sure that the chassis is level.
6. Have a second person secure the switch to the rack by inserting the screws
appropriate for your rack through the bracket and the threaded holes on the rack.