Juniper Networks EX8208 manual Routing Engines and Switch Fabric, Line Cards, Cooling System

Chapter 1: EX8208 Switch Overview

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” on page 24. An SRE module contains a Routing Engine and switch fabric. The SRE modules are installed in the front of the chassis in the slots labeled SRE0 and SRE1. See “Slot Numbering for an EX8208 Switch” on page 13. A base configuration EX8208 switch has one SRE module. A redundant configuration EX8208 switch has a second SRE module. See “EX8208 Switch Configurations” on page 6.

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 a redundant switch fabric. The additional switch fabric provides full 2+1 switch fabric redundancy to the switch. See “Switch Fabric (SF) Module in an EX8208 Switch” on page 28.

Line Cards

The EX8208 switch features eight horizontal line card slots and supports the 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 field-replaceable units (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” on page 13. All line cards are hot-removable and hot-insertable.

The following line cards are available for EX8208 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” on page 30.

•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” on page 31.

•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” on page 33.

•48-port 10/100/1000 RJ-45 line card: This line card had 48 10/100/1000 Gigabit Ethernet ports with RJ-45 connectors on its faceplate. See “48-portRJ-45 Line Card in an EX8200 Switch” on page 34.

Cooling System

The cooling system in an EX8208 switch consists of a hot-removable and hot-insertable 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” on page 53.

Copyright © 2010, Juniper Networks, Inc. 5