Figure 10: Sf Module In An Ex8208 Switch - Juniper EX8208 Complete Hardware Manual

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Figure 10: SF Module in an EX8208 Switch

The SF module can be installed only in the slot labeled SF. The SF module is keyed so
that it does not fit in the other slots in the chassis. See "Slot Numbering for an EX8208
Switch" on page 13.
In the base configuration, an SF module is used with a single Switch Fabric and Routing
Engine (SRE) module to build a nonredundant system that provides full bandwidth.
However, a base configuration EX8208 switch has no Routing Engine and switch control
redundancy or switch fabric redundancy. In a base configuration, the main function of
the SF module is to switch data between line cards. See "Understanding EX8208 Switch
Component and Functionality Redundancy" on page 11.
In a redundant configuration, an SF module is used with two SRE modules to achieve
full bandwidth along with Routing Engine and switch control redundancy and switch
fabric redundancy. In a redundant configuration, the main function of the SF module is
to provide a redundant switching plane for the switch. See "Understanding EX8208
Switch Component and Functionality Redundancy" on page 11.
In a redundant configuration, the SF module is hot-pluggable. However, in the base
configuration, you must take the SF module offline before removing it.
The SF module contains logic that determines which SRE module is the master. The
master SRE module controls many internal functions of the SF module.
The SF module provides these functions:
Provide redundant data path connectivity for the switch in the redundant configuration
Provide nonredundant data path connectivity for the switch in the base configuration
The SF module has these components:
SF module LEDs—Indicate system status. See "SF Module LEDs in an EX8208 Switch"
on page 32.
Ejector levers—Used for installing and removing the SF module.
Captive screws—Secure the SF module in place.
Installing an SF Module in an EX8208 Switch on page 151
Removing an SF Module from an EX8208 Switch on page 215
Chapter 2: Component Descriptions
31