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Routing Engines and Switch Fabric
Switchingfunctionality,systemmanagement,andsystemcontrolfunctionsofanEX8208
switch are performed bya Switch Fabricand RoutingEngine (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
switchingfunctionalitytoabaseconfigurationEX8208switch.TheSFmoduleisinstalled
in the front of the chassis in the slot labeled SF. In a redundant configuration the SF
moduleprovidesa redundantswitchfabric.Theadditionalswitchfabricprovides full2+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-port10-GigabitEthernetSFP+linecard:Thislinecardhas4010-gigabitSFP+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-port RJ-45 Line Card
in an EX8200 Switch” on page 34.
Cooling System
Thecoolingsysteminan EX8208switchconsistsofahot-removableandhot-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.
5Copyright©2010, JuniperNetworks, Inc.
Chapter1:EX8208 SwitchOverview