8Connecting the Stacking Ports (Optional)Before you make your stacking port connections, rack-mount the systems or insert them into a cabinet.NOTE: You can stack up to six S4820T switches. You cannot stack the S4820T system with other S-Series systems.1. Insert one end of the cable into a configured port.2. Insert the other end of the cable into a similarly configured port of the adjacent system.There are no unique stacking ports; you can configure the RJ-45 and QSFP+ ports to act as stackingports. The RJ-45 ports are labeled 0 to 47. The lower QSFP+ ports are labeled 48 and 56. The upperQSFP+ ports are labeled 52 and 60.NOTE: Data center bridging (DCB) is not supported if you use ports 0 to 47 for stacking.Important Points to RememberWhen stacking the S4820T, ensure that:• You configure data ports as stacking ports in predefined stacking groups of 40G (four 10G ports orone 40G port).• When you assign a stack-group number, you configure the ports associated with that group asstacking ports (refer to the following figure):– Stack Group 0 — Ports 0 to 3– Stack Group 1 — Ports 4 to 7– Stack Group 2 — Ports 8 to 11– . . .– Stack Group 11 — Ports 44 to 47– Stack Group 12 — Port 48– Stack Group 13 — Port 52– Stack Group 14 — Port 56– Stack Group 15 — Port 60Connecting the Stacking Ports (Optional) 39