Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 865

51 Stacking Using the Dell Networking OS stacking feature, you can interconnect multiple switch units with stacking ports or front end user ports. The stack becomes manageable as a single switch through the stack management unit. The system accepts Unit ID numbers from 0 to 11 and it supports stacking up to six units. Topics: • Stacking Overview • Important Points to Remember • Stacking Installation Tasks • Stacking Configuration Tasks • Verify a Stack Configuration • Remove Units or Front End Ports from a Stack • Troubleshoot a Stack Stacking Overview Dell Networking OS elects a management (master) unit, a standby unit, and all other units are member units. Dell Networking OS presents all of the units. For example, to access Ten GigabitEthernet Port 1 on Stack Unit 1, enter interface tengigabitethernet 1/1 from CONFIGURATION mode. Stack Management Roles The stack elects the management units for the stack management. • Stack master - primary management unit, also called the master unit. • Standby - secondary management unit. • Stack units - the remaining units in the stack, also called stack members. The system supports up to six stack units. • Stack group - Each set of four 10G ports or each individual 40G port correspond to a stack-group. To configure the front ports on the device to be stacking-ports, use the CLI. The master holds the control plane and the other units maintain a local copy of the forwarding databases. From the stack master you can configure: • System-level features that apply to all stack members. • Interface-level features for each stack member. The master synchronizes the following information with the standby unit: • Stack unit topology • Stack running configuration (which includes ACL, LACP, STP, SPAN, and so on.) • Logs. The master switch maintains stack operation with minimal impact in the event of: Stacking 865