Rear Cards in a QFX3008-I Interconnect Device
The rear cards provide the intermediate stage of switch fabric functionality in a QFX3008-I Interconnect Device. See Figure 1.
A QFX3008-I Interconnect Device has eight rear cards. In the QFX3008-I Interconnect Device, all eight rear cards are simultaneously active when the device is operational. All rear cards are fully connected to all installed 16-port QSFP+ front cards. If a single rear card fails, the input/output traffic for that card is load-balanced among the remaining rear cards, providing graceful degradation in switching performance. The impact of a rear card failure on the performance of a QFX3008-I Interconnect Device varies based on the number of 16-port QSFP+ front cards installed in the device and the traffic mix flowing through them.
The rear cards are installed at the rear of the chassis in the
7. See Slot Numbering for a QFX3008-I Interconnect Device.
The rear cards are hot-insertable and hot-removable field-replaceable units (FRUs). However, you must take the rear cards offline before removing them. See Taking the Rear Card Offline in a QFX3008-I Interconnect Device.
The rear cards provide these functions:
Provide data path connectivity for the QFabric (switch data between Node devices)
The rear cards have these components:
Rear card LEDs—Indicate system status. See Rear Card LEDs on a QFX3008-I Interconnect Device.
Ejector levers—Used for installing and removing the rear card.