The EX8216 is a modular Ethernet switch designed for high-density environments. It provides high performance, scalable connectivity, and reliability through redundant components including routing engines, switch fabrics, fan trays, and load-sharing power supplies. Key components include the midplane, routing engines, switch fabrics, 16 line card slots, dual fan trays, and redundant power supplies. It can be managed through the same interfaces as other Juniper devices and can be configured into a virtual chassis using an external routing engine.

1. EX8216 Core Switch
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2. EX8216 Switch Hardware
EX8216 Ethernet Switches provide:
1. High Performance
2. Scalable Connectivity
3. Carrier-Class Reliability.
 The EX8216 switch is a half-rack, midplane
architecture, modular Ethernet switch that is
designed for ultra high-density environments
such as campus aggregation, data center, or
high performance core switching environments.

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EX8216 switches provide high-availability and
redundancy for all major hardware components,
including Routing Engine (RE) modules, Switch
Fabric (SF) modules, fan trays (with redundant
fans), and load-sharing 2000 W AC, 3000 W AC,
and 3000 W DC power supplies.
 We can form an EX8200 Virtual Chassis by
connecting individual EX8200 switches to an
XRE200 External Routing Engine.

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A Virtual Chassis is multiple switches
connected together that operate as a single
network entity.
 We can manage EX8216 switches using the
same interfaces that you use for managing other
devices running the same operating system—the
command-line interface (CLI), the J-Web
graphical interface, and the Network and
Security Manager (NSM).

5. Component of EX8216 Core Switch
These are the some main component of EX8216
Core Switch:
1. Software
2. Chassis Physical Specifications, LCD
Panel, and Midplane
3. Routing Engines and Switch Fabric
4. Line Cards
5. Cooling System
6. Power Supplies

6. Software
The Juniper Networks EX Series Ethernet
Switches run Junos OS, which provides Layer 2
and Layer 3 switching, routing, and security
services.
 The same Junos OS code base that runs on
EX Series switches also runs on all Juniper
Networks J Series, M Series, MX Series, and
T Series routers and SRX Series devices.

7. Chassis Physical Specifications,
LCD Panel, and Midplane
EX8216 switches are designed to optimize rack
space and cabling. The EX8216 switch is 21
rack units (21 U) in size (1/2 rack). Two EX8216
switches can fit in a standard 42 U rack.

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The EX8216 switch has a chassis-level LCD panel that displays
Routing Engine and switch fabric status as well as chassis
components’ alarm information for rapid problem identification.
The LCD panel provides a user-friendly interface for performing
initial switch configuration, rolling back a configuration, or
restoring the switch to the factory default configuration.
 The EX8216 chassis midplane distributes the
data, control, and management signals to system components
and distributes power throughout the system.

9. Routing Engines
System management and system control functions of
an EX8216 switch are performed by the Routing
Engine (RE) module. An RE module contains a
Routing Engine. The RE modules are hot-insertable
and hot-removable field-replaceable units (FRUs)
that are installed in the front of the chassis in the
slots labeled RE0 and RE1.
 A base configuration (AC version) EX8216 switch
has one RE module. A redundant configuration (AC
and DC versions) EX8216 switch has a second RE
module for redundancy.

10. Switch Fabric
The Switch Fabric (SF) modules provide the
switching functionality to an EX8216 switch. The SF
modules are hot-insertable and hot-removable FRUs.
All eight SF modules are installed in the rear of the
chassis in the slots labeled SF7 through SF0. In an
EX8216 switch, all eight SF modules are active and
must be installed in the switch for normal operation.
 If a single SF module fails, the input/output traffic
for that module is load-balanced among the
remaining SF modules, providing graceful
degradation in midplane performance.

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The impact of an SF module failure on the
performance of an EX8216 switch varies based on
the type of line cards installed in the switch and the
traffic mix flowing through them. In an EX8216 switch
configuration that is fully loaded with 8-port 10-
Gigabit Ethernet SFP+ line cards, if one SF module
fails, the remaining seven SF modules still have
sufficient switching capacity to maintain continuous
switch operation at full wire-rate performance.
 The EX8216 switch can also be connected to an
XRE200 External Routing Engine. An XRE200
External Routing Engine is used to connect multiple
EX8200 switches into a Virtual Chassis.

12. Line Cards
The EX8216 switch features 16 horizontal line
card slots and supports wire-rate performance
for all packet sizes for the installed line cards.
The line cards in EX8200 switches combine a
Packet Forwarding Engine and Ethernet
interfaces on a single assembly. They are FRUs,
and you can install them in the slots labeled 0
through 15 on the front of the switch chassis. All
line cards are hot-insertable and hot-removable.

13. Line Cards Description

14. Cooling System
The cooling system in an EX8216 switch
consists of two hot-insertable and hot-removable
FRU fan trays. Each fan tray contains nine fans.
Both fan trays install vertically on the left front of
the chassis and provide side-to-side chassis
cooling and front-to-side cooling.
 The top and bottom fan trays are identical and
interchangeable. However, only the top fan tray
cools the SF modules installed in the rear of the
chassis.

15. Power Supplies
Power supplies for the EX8216 switch are fully redundant,
load-sharing, and hot-insertable and hot-removable
FRUs. Each EX8216 switch chassis can hold up to six AC
or DC power supplies. The redundant AC configuration
ships with six AC power supplies to provide the capacity
to power the system using N+1 or N+N power
redundancy.
The redundant DC configuration ships with four DC power
supplies. The dual inputs of the DC supplies provide
direct support for N+N power redundancy. The redundant
configuration also provides sufficient capacity for N+1
redundancy in most configurations; if necessary, up to two
additional DC supplies can be added to the system.

16. Kashif Latif