Cisco Catalyst 9400 Series Hardware Installation Manual page 72

Installing the Cable Guide With Shelf Brackets
Step 2
Using only one screw on each side, secure the L bracket to the rack rails.
Step 3 Position the cable guides and align with the L brackets and shelf brackets.
Using one screw on each side, align the cable guide mounting holes with the shelf bracket holes and the rack
rail holes,
Using two screws on each side, align the cable guide mounting holes with the L bracket holes and the rack
rail holes.
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
66
Installing the Switch