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EX9253 System Overview

 

EX9253 Switch Hardware Overview

Juniper Networks EX9253 Ethernet Switches provide high performance, scalable connectivity, and carrier-class reliability for high-density environments such as campus-aggregation and data-center networks. The EX9253 switch has a throughput of up to 2.4 terabits per second (Tbps). The EX9253 switch is a modular system that provides redundancy for all major hardware components, including Routing Engine and power supplies.

You can manage EX9253 switches by using the CLI.

Software

The Juniper Networks EX Series Ethernet Switches run Junos OS, which provides Layer 2 and Layer 3 switching, routing, and security services.

Benefits of the EX9253 Switch

Simplified network architecture—EX9253 switches deliver a simple, secure, virtualized network environment that increases business agility. They are ideal for simplifying campus, data center, and combined campus and data center network environments by collapsing network layers. In a multichassis link aggregation (MC-LAG) configuration in the campus, you can use EX9253 switches along with EX4300, EX3400, and EX2300 switches to eliminate Spanning Tree Protocol (STP); they collapse the core and aggregation layers, thereby simplifying the network architecture and network operations. In a data center, you can use EX9253 switches to collapse core and aggregation layers. In combined campus and data center environments, EX9253 switches consolidate network layers to simplify the network architecture and operations.

MACsec support—EX9253-12C8Q-M line card supports IEEE 802.1AE MACsec with AES-256 bit encryption, ensuring link-layer data confidentiality, data integrity, and data origin authentication.

Chassis Physical Specifications

The EX9253 switch is three rack units (3  U) in size. Each EX9253 switch is designed to optimize rack space and cabling.

See Figure 1, Figure 2, and Figure 3.

Figure 1: Front View of an EX9253 Switch
Front View of an EX9253
Switch
  1
Host subsystem
  2
Line card installed in line card slots MPC0 and MPC1
Figure 2: Rear View of an EX9253 Switch with AC Power Supplies
Rear View of an
EX9253 Switch with AC Power Supplies
  1
AC power supplies
  2
Fan trays
Figure 3: Rear View of an EX9253 Switch with DC Power Supplies
Rear View of an
EX9253 Switch with DC Power Supplies
  1
DC power supplies
  2
Fan trays

Host Subsystem

Switching and routing functionality, system management, and system control functions of an EX9253 switch are performed by the host subsystem. The host subsystem consists of two Routing Engines.

You must install either one or two Routing Engines in slots labeled RE0 and RE1 on the front panel of the chassis. A base configuration EX9253 switch has one Routing Engine. A redundant configuration EX9253 switch has two Routing Engines. For more information, see EX9253 Switch Configurations.

Line Cards

The EX9253 switch has two horizontal line card slots. The line cards for EX9253 switches combine a Packet Forwarding Engine and Ethernet interfaces in a single assembly. Line cards are field-replaceable units (FRUs) that you can install in the line card slots labeled MPC0 and MPC1 on the front panel of the switch chassis.

Table 1 lists the line cards available for EX9253 switches.

Table 1: Line Cards for EX9253 Switches

Model

Description

Additional Information

EX9253-6Q12C

A line card with six built-in QSFP+ ports, each of which can house QSFP+ pluggable transceivers and 12 built-in QSFP28 ports, each of which can house QSFP28 pluggable transceivers

EX9253-6Q12C Line Card

EX9253-6Q12C-M

A line card with six built-in QSFP+ ports, each of which can house QSFP+ pluggable transceivers and 12 built-in QSFP28 ports with Media Access Control Security (MACsec) capability, each of which can house QSFP28 pluggable transceivers

EX9253-6Q12C-M Line Card

Cooling System

The cooling system consists of four hot-removable and hot-insertable fan trays and an air filter and provides front-to-back chassis cooling (see EX9253 Cooling System).

Power Supplies

Power supplies for the EX9253 switch are fully redundant, load-sharing, and hot-removable and hot-insertable FRUs. Each EX9253 switch chassis can hold up to six AC or DC power supplies. The power supplies connect to the midplane, which distributes the power to the switch components depending on their voltage requirements.

Table 2 shows the details of the power supplies supported on EX9253 switches.

Table 2: Power Supplies Supported on EX9253 Switches

Power Supply

Input Voltage

800 W AC

90–140 VAC

1600 W AC

180–260 VAC

1100 W DC

–40 VDC through –72 VDC

A base configuration EX9253 switch ships with three power supplies. A redundant configuration EX9253 switch ships with four power supplies. See EX9253 Power System and EX9253 Switch Configurations.

Caution

Do not mix different types of power supplies (AC and DC) in the same chassis.

ESD Point

The ESD point on the EX9253 switch is on the front panel (see Figure 4).

Figure 4: ESD Point Location
ESD Point Location

Cable Management Brackets

The cable management brackets (see Figure 5) consists of dividers and are installed on the front of the chassis. The cable management bracket enables you to route the cables outside the switch and away from the components on the front panel.

Figure 5: Cable Management Bracket
Cable Management
Bracket

The air filter unit is installed on the cable management brackets.

EX9253 Switch Configurations

Table 3 lists the hardware configurations for an EX9253 switch and the components included in each configuration.

Table 3: EX9253 Switch Hardware Configurations

Switch Configuration

Configuration Components

Model Number

First Junos OS Release

EX9253-BASE-AC

Chassis

EX9253-CHAS-3RU

18.2R1

One routing engine

EX9253-RE

Four fan trays

JNP-FAN-3RU

Three AC power supplies

JNP-PWR1600-AC

Cable management bracket and air filter unit

JNP-CM-3RU

Blank panels for empty slots

EX9253-LC-BLNK

EX9253-BASE-DC

Chassis

EX9253-CHAS-3RU

18.2R1

One routing engine

EX9253-RE

Four fan trays

JNP-FAN-3RU

Three DC power supplies

JNP-PWR1100-DC

Cable management bracket and air filter unit

JNP-CM-3RU

Blank panels for empty slots

EX9253-LC-BLNK

EX9253-RED-AC

Chassis

EX9253-CHAS-3RU

18.2R1

Two routing engines

EX9253-RE

Four fan trays

JNP-FAN-3RU

Four AC power supplies

JNP-PWR1600-AC

Cable management bracket and air filter unit

JNP-CM-3RU

Blank panels for empty slots

EX9253-LC-BLNK

EX9253-RED-DC

Chassis

EX9253-CHAS-3RU

18.2R1

Two routing engines

EX9253-RE

Four fan trays

JNP-FAN-3RU

Four DC power supplies

JNP-PWR1100-DC

Cable management bracket and air filter unit

JNP-CM-3RU

Blank panels for empty slots

EX9253-LC-BLNK

Note

You can install up to two line cards (in any combination) in the switch.

Note

Line cards are not part of the base or redundant configuration. You must order them separately.

Note

Additional power supplies (AC or DC) must be purchased separately.

EX9253 Switch Hardware and CLI Terminology Mapping

This topic describes the hardware terms used in EX9253 switch documentation and the corresponding terms used in the Junos OS CLI. See Table 4.

Table 4: CLI Equivalents of Terms Used in Documentation for EX9253 Switches

Hardware Item (CLI)

Description (CLI)

Value (CLI)

Item in Documentation

Additional Information

Chassis

EX9253

EX9253

Switch chassis

Chassis Physical Specifications of an EX9253 Switch

PEM (n)

One of the following:

  • JNP-PWR1600-AC

  • JNP-PWR1100-DC

n is a value in the range 0-3. The value corresponds to the power supply slot number.

AC or DC power supply

EX9253 Power System

Routing Engine (n)

EX9253-RE

n is a value in the range 0-1.

In base configuration, only one entry appears.

In redundant configuration, two entries appear; one for each Routing Engine installed in the chassis.

Routing Engine

Host Subsystem in an EX9253 Switch

FPC (n)

Abbreviated name of the line card.

One of the following:

  • EX9253-6Q12C

  • EX9253-6Q12C-M

n is a value in the range of 0-1. 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 the FPC equivalents on the switch)

PIC (n)

Abbreviated name of the Physical Interface Card (PIC).

n is a value in the range 0-1. The value corresponds to the slot number in which the PIC is installed.

Abbreviated name of the Physical Interface Card (PIC)

Xcvr (n)

Abbreviated name of the transceiver.

n is a value equivalent to the number of the port in which the transceiver is installed.

Optical transceivers

Pluggable Transceivers Supported on an EX9253 Switch

Fan tray (n)

JNP FAN 3RU

n is a value equivalent to the number of the port in which the fan tray is installed.

Fan tray

EX9253 Cooling System