Dell S4048–ON Configuration Manual page 823

NOTE: If the removed management unit is brought up as a standalone unit or as part of a different stack, there is a
possibility of MAC address collisions.
A standalone is added to a stack. The standalone and the master unit have the same priority, but the standalone has a lower MAC
address, so the standalone reboots. In the second example, a standalone is added to a stack. The standalone has a higher priority
than the stack, so the stack (excluding the new unit) reloads.
Example of Adding a Standalone with a Lower MAC Address to a Stack
----------STANDALONE BEFORE CONNECTION---------------
Standalone#show system brief
Stack MAC : 00:01:e8:d5:ef:81
-- Stack Info --
Unit UnitType Status
------------------------------------------------------
0 Management online
S4048-ON S4048-ON
1 Member not present
2 Member not present
3 Member not present
4 Member not present
5 Member not present
6 Member not present
[output omitted]
Standalone#show system | grep priority
Master priority : 0
-----------STACK BEFORE CONNECTION----------------
Stack#show system brief
Stack MAC : 00:01:e8:d5:f9:6f
-- Stack Info --
Unit UnitType Status
---------------------------------------------------
0 Standby online
1 Management online
2 Member not present
3 Member not present
4 Member not present
5 Member not present
6 Member not present
7 Member not present
[output omitted]
Stack#show system stack-unit 1 | grep priority
Master priority : 0
Stack#show system stack-unit 2 | grep priority
Master priority : 0
Example of Adding a Standalone with a Lower MAC Address and Equal Priority to a Stack
---------------STANDALONE AFTER CONNECTION-----------------
Standalone#%STKUNIT0-M:CP %POLLMGR-2-ALT_STACK_UNIT_STATE: Alternate Stack-unit is present
00:20:20: %STKUNIT0-M:CP %CHMGR-5-STACKUNITDETECTED: Stack unit 1 present
00:20:22: %STKUNIT0-M:CP %CHMGR-5-STACKUNITDETECTED: Stack unit 2 present
Going for reboot. Reason is Stack merge
[bootup messages omitted]
---------------STACK AFTER CONNECTION---------------------
Stack# 3w1d14h: %STKUNIT1-M:CP %CHMGR-5-STACKUNITDETECTED: Stack unit 2 present
3w1d14h: %STKUNIT1-M:CP %CHMGR-2-STACKUNIT_DOWN: Stack unit 2 down - card removed
3w1d14h: %STKUNIT1-M:CP %CHMGR-5-STACKUNITDETECTED: Stack unit 2 present
3w1d14h: %STKUNIT1-M:CP %CHMGR-5-CHECKIN: Checkin from Stack unit 2 (type S4048-ON , 52
ports)
3w1d14h: %S4048-ON %CHMGR-0-PS_UP: Power supply 0 in unit 2 is up
3w1d14h: %STKUNIT1-M:CP %CHMGR-5-STACKUNITUP: Stack unit 2 is up
Stack#show system brief
ReqTyp CurTyp Version Ports
ReqTyp CurTyp Version
S4048-ON
S4048-ON
Ports
823
Stacking