Dell S4048-ON, Руководство по настройке

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Stacking
Using the Dell Networking OS stacking feature, you can interconnect multiple switch units with stacking ports or front end user
ports. (The S4048-ON uses front end user ports for stacking.) The stack becomes manageable as a single switch through the stack
management unit.
The system accepts Unit ID numbers from 1 to 6 and the it supports stacking up to six units.
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 like line cards; 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.
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:
• Switch failure
• Inter-switch stacking link failure
• Switch insertion
• Switch removal
If the master switch goes off line, the standby replaces it as the new master and the switch with the next highest priority or MAC
address becomes standby.
Stack Master Election
The stack elects a master and standby unit at bootup time based on two criteria.
• Unit priority — User-configurable. The range is from 1 to 14. A higher value (14) means a higher priority. The default is 1 . By
removing the stack-unit priority using the no stack-unit priority command, you can set the priority back to the default
Stacking
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