Stacking; S-Series Stacking Overview; Stack Management Roles - Dell S4820T Configuration Manual

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Stacking

Stacking is supported on the S4820T platform with the Dell Networking OS version 8.3.19.0 and newer.

NOTE: The S4820T commands accept Unit ID numbers 0-11, though The S4820T supports stacking

up to six units with Dell Networking OS version 8.3.19.0.

Using the Dell Networking OS stacking feature, you can interconnect multiple S-Series switch units with

dedicated stacking ports or front end user ports. (The S50, S55, and S60 use dedicated stacking ports; the

S4820T uses front end user ports for stacking.) The stack becomes manageable as a single switch

through the stack management unit.

Dell Networking OS elects a management (master) unit, a standby unit, and all other units are member

Dell Networking OS presents all of the units like line cards; for example, to access Ten GigabitEthernet

Port 1 on Stack Unit 1, enter interface tengigabitethernet 1/1 from CONFIGURATION mode.

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.)

The master switch maintains stack operation with minimal impact in the event of:

Switch failure