• 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 0. By removing the stack-unit priority using the no stack-unit priority command,
you can set the priority back to the default value of zero. The unit with the highest priority is elected the
master management unit; the unit with the second highest priority is elected the standby unit.
• MAC address (in case of priority tie) — The unit with the higher MAC value becomes the master unit.
The stack takes the MAC address of the master unit and retains it unless it is reloaded.
To view which switch is the stack master, enter the show system command.
Dell#show system
Stack MAC : 34:17:eb:f2:94:c4
Reload-Type : normal-reload [Next boot : normal-reload]
-- Unit 1 --
Unit Type : Management Unit
Status : online
Next Boot : online
Required Type : S4048-ON - 54-port TE/FG (SK-ON)
Current Type : S4048-ON - 54-port TE/FG (SK-ON)
Master priority : 14
Hardware Rev : 2.0
Num Ports : 72
Up Time : 33 min, 51 sec
Dell Networking OS Version : 1-0(0-5005)
Jumbo Capable : yes
POE Capable : no
FIPS Mode : disabled
Burned In MAC : 34:17:eb:f2:94:c4
No Of MACs : 3
-- Power Supplies --
Unit Bay Status Type FanStatus FanSpeed(rpm)
---------------------------------------------------------------------------
1 1 up UNKNOWN up 10704
1 2 absent absent 0
Stacking 1012
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