A redundant J-EX8208 switch has one SF module.Figure 10: SF Module in a J-EX8208 SwitchThe SF module can be installed only in the slot labeled SF. The SF module is keyed sothat it does not fit in the other slots in the chassis. See “Slot Numbering for a J-EX8208Switch” on page 11.In a redundant configuration, an SF module is used with two SRE modules to achievefull bandwidth along with Routing Engine and switch control redundancy and switchfabric redundancy. In a redundant configuration, the main function of the SF module isto provide a redundant switching plane for the switch. See “Understanding J-EX8208Switch Component and Functionality Redundancy” on page 9.In a redundant configuration, the SF module is hot-pluggable.The SF module contains logic that determines which SRE module is the master. Themaster SRE module controls many internal functions of the SF module.The SF module provides redundant data path connectivity for the switch in the redundantconfiguration.The SF module has these components:• SF module LEDs—Indicate system status. See “SF Module LEDs in a J-EX8208 Switch”on page 26.• Ejector levers—Used for installing and removing the SF module.• Captive screws—Secure the SF module in place.RelatedDocumentationInstalling an SF Module in a J-EX8208 Switch on page 120•• Removing an SF Module from a J-EX8208 Switch on page 169• Taking the SF Module Offline in a J-EX8208 Switch on page 168SF Module LEDs in a J-EX8208 SwitchThe Switch Fabric (SF) module has two LEDs on the left side of the module’s front panel.See Figure 11 on page 27. Table 16 on page 27 describes these LEDs, their colors andstates, and the status they indicate.26Dell PowerConnect J-Series J-EX8208 Ethernet Switch Hardware Guide
