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    EX8208 Switch Hardware Overview

    Juniper Networks EX8208 Ethernet Switches provide high performance, scalable connectivity, and carrier-class reliability for high-density environments such as campus-aggregation and data-center networks. The EX8208 switch is a modular system that provides high availability and redundancy for all major hardware components, including Routing Engines, switch fabric, fan tray (redundant fans), and 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 EX8208 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).


    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 Backplane

    The EX8208 switch is 14 rack units (14 U) in size (1/3 rack). Three EX8208 switches can fit in a standard 42 U rack. Each EX8208 switch is designed to optimize rack space and cabling. See Figure 1.

    Figure 1: EX8208 Switch

    EX8208 Switch

    The EX8208 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 its default settings. See LCD Panel in an EX8200 Switch.

    The EX8208 chassis backplane distributes the data, control, and management signals to various system components along with distributing power throughout the system.

    See Chassis Physical Specifications of an EX8208 Switch.

    Routing Engines and Switch Fabric

    Switching functionality, system management, and system control functions of an EX8208 switch are performed by a Switch Fabric and Routing Engine (SRE) module. See Switch Fabric and Routing Engine (SRE) Module in an EX8208 Switch. An SRE module contains a Routing Engine and switch fabric. The SRE modules are field-replaceable units (FRUs) that are installed in the front of the chassis in the slots labeled SRE0 and SRE1. See Slot Numbering for an EX8208 Switch. A base configuration EX8208 switch has one SRE module. A redundant configuration EX8208 switch has a second SRE module. See EX8208 Switch Configurations.

    The Switch Fabric (SF) module, working with the SRE module, provides the necessary switching functionality to a base configuration EX8208 switch. The SF module is installed in the front of the chassis in the slot labeled SF. In a redundant configuration, the SF module provides full 2+1 switch fabric redundancy to the switch. See Switch Fabric (SF) Module in an EX8208 Switch.

    The EX8208 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.

    Line Cards

    The EX8208 switch features eight horizontal line card slots and supports line rate for each line card. The line cards in EX8200 switches combine a Packet Forwarding Engine and Ethernet interfaces on a single assembly. Line cards are FRUs that can be installed in the line card slots labeled 0 through 7 on the front of the switch chassis. See Slot Numbering for an EX8208 Switch. All line cards are hot-removable and hot-insertable.

    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



    Additional Information


    8-port SFP+ line card

    8-port SFP+ Line Card in an EX8200 Switch


    8-port SFP+ line card, extra-scale

    8-port SFP+ Line Card in an EX8200 Switch


    40-port SFP+ line card

    40-port SFP+ Line Card in an EX8200 Switch


    40-port SFP+ line card, extra-scale

    40-port SFP+ Line Card in an EX8200 Switch


    40-port PoE+ with 4-port SFP and 2-port SFP+ line card

    EX8200-2XS-40P Line Card


    40-port RJ-45 with 4-port SFP and 2-port SFP+ line card

    EX8200-2XS-40T Line Card


    48-port PoE+ 20 Gbps line card

    EX8200-48PL Line Card


    48-port RJ-45 20 Gbps line card

    EX8200-48TL Line Card


    48-port RJ-45 line card

    48-port RJ-45 Line Card in an EX8200 Switch


    48-port RJ-45 line card, extra-scale

    48-port RJ-45 Line Card in an EX8200 Switch


    48-port SFP line card

    48-port SFP Line Card in an EX8200 Switch


    48-port SFP line card, extra-scale

    48-port SFP Line Card in an EX8200 Switch

    Note: 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.

    Cooling System

    The cooling system in an EX8208 switch consists of a hot-removable and hot-insertable FRU fan tray. The fan tray contains 12 fans. The fan tray installs vertically on the left front of the chassis and provides side-to-side chassis cooling. See Cooling System and Airflow in an EX8208 Switch.

    Power Supplies

    Power supplies for the EX8208 switch are fully redundant, load-sharing, and hot-removable and hot-insertable (FRUs. Each EX8208 switch chassis can hold up to six AC or DC power supplies.

    Table 2 shows the details of the power supplies available for EX8208 switches.

    Table 2: Power Supplies Supported on EX8208 Switches

    Power Supply

    Input Voltage

    Output Power

    2000 W AC

    Low-voltage line (100-120 VAC)

    1200 W

    High-voltage line (200-240 VAC)

    2000 W

    3000 W AC

    Low-voltage line (100-120 VAC)

    Not supported

    High-voltage line (200-240 VAC)

    3000 W

    2000 W DC

    -40 VDC through -72VDC

    2000 W

    Only two AC power supplies (provided) are required to power on the base AC configuration switch. 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 EX8208 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 EX8208 Switch Configurations.

    Caution: Mixing different types of power supplies (AC and DC) in the same chassis is not supported.

    Modified: 2015-05-27