Users Guide

Speed in RPM
The following example shows the show system stack-ports command.
Dell#show system stack-ports
Topology: Ring
Interface Connection Link Speed Admin Link Trunk
(Gb/s) Status Status Group
------------------------------------------------------------------
1/1/1 3/6/1 40 up up
1/2/1 3/7/1 40 up up
3/1/1 40 up down
3/2/1 40 up down
3/3/1 1/5/1 40 up up
3/4/1 1/6/1 40 up up
Influencing Management Unit Selection on a
Stack
Stack priority is the system variable that Dell Networking OS uses to determine which units in the stack are the
master and standby management units. If multiple units tie for highest priority, the unit with the highest MAC
address prevails.
If management was determined by priority only, a change in management occurs when:
• the management unit is powered down or a failover occurs.
• you disconnect the management unit from the stack.
When the management unit fails, the unit disappears from the stack topology. At that time, the standby unit
detects the communication loss and switches from the standby unit role to the management unit role in the
stack. From the remaining units in the stack, the system selects a new standby unit based on the unit priority
using the same algorithm used when the stack was initially created. When the failed unit recovers, it takes the
next available role, usually that of a stack member.
• Influence the selection of the stack management units.
CONFIGURATION mode
stack-unit unit-number priority priority-value
The unit with the numerically highest priority is elected the master management unit, and the unit with the
second highest priority is the standby unit.
The range is from 1 to 14.
The default is 0.
Managing Redundancy on a Stack
Use the following commands to manage the redundancy on a stack.
• Reset the current management unit and make the standby unit the new master unit.
EXEC Privilege mode
Stacking 958