Dell Force10 S25-01-GE-24V FTOS 8.4.2.7 Configuration Guide for E-Series TeraS - Page 1027

You may stack any combination of S-Series models that have the same FTOS version. Figure 50-8 shows two common stacking topologies, ring and cascade (also called daisy-chain). A ring topology provides some performance gains and stack integrity. Figure 50-8. Common S-Series Stacking Topologies Ring Connection Cascade Connection A B A B A B A B A B A B A B Stacking 001 Facing the rear of an S-Series unit, stack-port are numbered from left to right, beginning with the highest Ethernet port number (n) plus 1. For example, for a 48-port unit with two 12-Gigabyte stacking modules, the stack-ports are 49, 50, 51, and 52, starting from the left. To add a unit to an existing stack: Step 1 2 3 4 5 Task Command Syntax Verify that each unit has the same FTOS version prior to stacking them together. show version Pre-configure unit numbers for each unit so that the stacking is deterministic upon boot up. stack-unit renumber Configure the switch priority for each unit to make management unit selection deterministic. stack-unit priority Connect the units using stacking cables. Power the stack one unit at a time. Start with the management unit, then the standby, followed by each of the members in order of their assigned stack number (or the position in the stack you want each unit to take). Allow each unit to completely boot, and verify that the unit is detected by the stack manager, and then power the next unit. show system brief Command Mode EXEC Privilege EXEC Privilege CONFIGURATION EXEC Privilege Stacking S-Series Switches | 1027