EX8216 Switch Hardware Overview
The Juniper Networks EX8216 Ethernet 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. Like other Juniper Networks EX8200 Ethernet Switches, EX8216 switches provide high performance, scalable connectivity, and carrier-class reliability.
You can manage EX8216 switches using the same Junos interfaces that you use for other Junos platforms—the Junos operating system (Junos OS) command-line interface (CLI), the J-Web graphical interface, and Network and Security Manager (NSM).
Software
The EX Series switches—Juniper Networks EX3200 Ethernet Switch, Juniper Networks EX4200 Ethernet Switch, and Juniper Networks EX8200 Ethernet Switch models—run under the Juniper Networks Junos OS, which provides Layer 2 and Layer 3 switching, routing, and security services. The same Junos code base that runs on EX Series switches also runs on all Juniper Networks J Series, M Series, MX Series, and T Series routers.
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.
Figure 1: EX8216 Switch Front
Figure 2: EX8216 Switch Rear
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 field-replaceable units (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.
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 field-replaceable units (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.
The following line cards are available for EX8216 switches:
- 8-port 10-Gigabit Ethernet SFP+ line card: This line card has eight 10-gigabit SFP+ ports on its faceplate in which you can install SFP+ transceivers. See 8-port SFP+ Line Card in an EX8200 Switch.
- 40-port 10-Gigabit Ethernet SFP+ line card: This line card has 40 10-gigabit SFP+ ports on its faceplate in which you can install either SFP+ or SFP transceivers. See 40-port SFP+ Line Card in an EX8200 Switch.
- 48-port 100/1000 SFP line card: This line card has 48 1-gigabit SFP ports on its faceplate in which you can install SFP transceivers. See 48-port SFP Line Card in an EX8200 Switch.
- 48-port 10/100/1000 RJ-45 line card: This line card has 48 10/100/1000 Gigabit Ethernet ports with RJ-45 connectors on its faceplate. See 48-port RJ-45 Line Card in an EX8200 Switch.
Cooling System
The cooling system in an EX8216 switch consists of two hot-insertable and hot-removable, field-replaceable unit (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 Cooling System and Airflow in an EX8216 Switch.
Power Supplies
Power supplies for the EX8216 switch are fully redundant, load-sharing, and hot-insertable and hot-removable field-replaceable units (FRUs). Each EX8216 switch chassis can hold up to six 2000 W AC, six 3000 W AC, or six 3000 W DC power supplies.
The 2000 W AC power supplies support both low-voltage line (100–120 VAC) and high-voltage line (200–240 VAC) AC power configurations on an EX8216 switch.
Each 3000 W AC power supply delivers 3000 W of power at high-voltage line (200–240 VAC) to the EX8216 chassis. Low-voltage line input is not supported for the 3000 W AC power supplies on the EX8216 switch. Each DC power supply delivers 3000 W of power to the chassis when the input voltage is in the range –40 VDC through –72 VDC.
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. See AC Power Supply in an EX8200 Switch, DC Power Supply in an EX8200 Switch, and EX8216 Switch Configurations.
 | Caution: Mixing different types of power supplies in the same chassis is not a supported configuration. |
