EX8216 System Overview
EX8216 Switch Hardware Overview
Juniper Networks EX8216 Ethernet Switches provide high performance, scalable connectivity, and 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. 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.
You can form an EX8200 Virtual Chassis by connecting individual EX8200 switches to an XRE200 External Routing Engine. A Virtual Chassis is multiple switches connected together that operate as a single network entity.
You can manage EX8216 switches using the same interfaces that you use for managing other devices running the Juniper Networks Junos operating system (Junos OS)—the command-line interface (CLI), the J-Web graphical interface, and the Network and Security Manager (NSM).
Benefits of the EX8216 Switch
Support for Virtual Chassis—EX8216 switches support Virtual Chassis technology. You can configure EX8200 switches in a Virtual Chassis and manage and operate them as a single network entity by using the XRE200 External Routing Engine.
High capacity—With a total capacity of up to 12 Terabits per second (Tbps), EX8216 is a powerful modular platform that delivers the performance, scalability, and high availability required for high-density data center, campus aggregation, and core switching environments.
Support for Juniper Networks Service Now solution—EX8200 switches support the Juniper Networks Service Now solution, a comprehensive set of tools that enable Juniper Networks J-Care Technical Service offerings to automate the delivery of tailored, proactive network intelligence and support services.
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 M Series, MX Series, and T Series routers and SRX Series Services Gateways.
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. See Figure 1 and Figure 2 and Chassis Physical Specifications of an EX8216 Switch.
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. See LCD Panel in an EX8200 Switch.
The EX8216 chassis midplane distributes the data, control, and management signals to system components and distributes power throughout the system. See Midplane in an EX8216 Switch.
Routing Engines and Switch Fabric
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. See Routing Engine (RE) Module in an EX8216 Switch and EX8216 Switch Configurations.
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. 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. See Switch Fabric (SF) Modules in an EX8216 Switch.
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. See XRE200 External Routing Engine Hardware Overview.
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.
Twelve line cards are available for EX8200 switches. The extra-scale line card models provide larger IPv4 and IPv6 route table sizes than the non-extra-scale models to store more unicast routes.
Table 1 shows the model numbers and descriptions of the line cards available for EX8200 switches.
Table 1: Line Cards Available for EX8200 Switches
8-port SFP+ line card
8-port SFP+ line card, extra-scale
40-port SFP+ line card
40-port SFP+ line card, extra-scale
40-port PoE+ with 4-port SFP and 2-port SFP+ line card
40-port RJ-45 with 4-port SFP and 2-port SFP+ line card
48-port PoE+ 20 Gbps line card
48-port RJ-45 20 Gbps line card
48-port RJ-45 line card
48-port RJ-45 line card, extra-scale
48-port SFP line card
48-port SFP line card, extra-scale
We recommend that you do not install extra-scale line card models and non-extra-scale models in the same switch or Virtual Chassis. If you install extra-scale line cards in a switch or Virtual Chassis that has non-extra-scale models installed, the IPv4 and IPv6 route table sizes default to those of the non-extra-scale models and you will not get the benefit of the increased table sizes of the extra-scale models.
You will experience these decreased route table sizes in a Virtual Chassis even when the non-extra-scale line cards are installed in one member switch and the extra-scale line cards are installed in another member switch.
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. See EX8216 Cooling System.
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.
Table 2 shows the details of the power supplies available for EX8216 switches.
Table 2: Power Supplies Supported on EX8216 Switches
2000 W AC
Low-voltage line (100-120 VAC)
High-voltage line (200-240 VAC)
3000 W AC
Low-voltage line (100-120 VAC)
High-voltage line (200-240 VAC)
3000 W DC
-40 VDC through -72VDC
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. See AC Power Supply in an EX8200 Switch and EX8216 Switch Configurations.
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. See DC Power Supply in an EX8200 Switch and EX8216 Switch Configurations.
Mixing different types of power supplies (AC and DC) in the same chassis is not supported.
EX8216 Switch Configurations
Table 3 lists the seven sample hardware configurations for an EX8216 switch—base (AC), redundant (AC and DC versions), and fully loaded chassis (AC and DC versions)—and the components included in each configuration.
The switch is shipped in only four of these seven configurations: base (AC), redundant (AC with 2000 W AC power supplies), redundant (AC with 3000 W AC power supplies), and redundant (DC).
Table 3: EX8216 Switch Hardware Configurations
Base configuration (AC)
Redundant configuration (AC with 2000 W AC power supplies)
Redundant configuration (AC with 3000 W AC power supplies)
Redundant configuration (DC)
Fully loaded chassis configuration (with 2000 W AC power supplies)
Fully loaded chassis configuration (with 3000 W AC power supplies)
Fully loaded chassis configuration (DC)
You can install up to 16 line cards (any combination of line cards) in the switch.
Line cards are not part of the base or redundant configurations. You must order them separately.
If you want to purchase additional power supplies (AC or DC) for your switch configuration, you must order them separately.
EX8216 Switch Hardware and CLI Terminology Mapping
This topic describes the hardware terms used in EX8216 switch documentation and the corresponding terms used in the Junos OS command line interface (CLI). See Table 4.
Table 4: CLI Equivalents of Terms Used in Documentation for EX8216 Switches
Hardware Item (CLI)
Item In Documentation
n is a value in the range 0–1.
Two line items appear in the CLI if both control boards (CBs) are installed in the chassis.
Routing Engine (RE) module (The switch does not have actual control boards; the RE modules are the equivalent items on the switch.)
On EX8200 standalone switches:
Abbreviated name of the Flexible PIC Concentrator (FPC)
One of the following:
n is a value in the range 0–15. The value corresponds to the line card slot number in which the line card is installed.
Line card (The switch does not have actual FPCs—the line cards are FPC equivalents on the switch.)
On EX8200 Virtual Chassis:
On Virtual Chassis member 0, n is a value in the range of 0–15 ; on member 1, n is a value in the range of 16–31.
Slot number of the line card within the Virtual Chassis
Abbreviated name of the transceiver
n is a value equivalent to the number of the port in which the transceiver is installed.
n is a value in the range 0–7.
More than one line item appears in the CLI if multiple switch interface boards (SIBs) are installed in a chassis.
Switch fabric (SF) module (The switch does not have actual SIBs; the SF modules are the equivalent items on the switch.)
One of the following:
n is a value in the range 0–5. The value corresponds to the power supply slot number.
AC or DC power supply
Top fan tray
Two line items appear in the CLI if both fan trays are installed in the chassis.
Bottom fan tray
Value of n is always 0.
This field indicates:
n is a value in the range of 0–7.
n is a value in the range of 0–15.
The switch does not have actual Dense Port Concentrators (DPCs)–the line cards are the DPC equivalents on the switch.
Value of n is always 0.