When changes occur in the SAN network fabric, the "Principal" switch is re-elected. The result usually depends on the WWN of the switches and on the priority set. By default, for all new switches, it is equal to the value: 0xFE. The rest of the switches in the fabric set themselves the "Subordinate" role.
To set your priority, run:
fabricprincipal --enable -p 0x01
The value of priorities can be as follows:
0x00 - not used, reserved;
0x01 - highest priority;
0x02 - this value should not be used either, it is generated by the switch to initiate a factory rebuild;
0x03 - 0xFE - range to be used for setting priorities (the larger the value, the lower the priority);
0xFF - with this value, the switch will become the "Principal" switch last, even the default settings have a higher priority.
To view information use:
fabricshow
fabricprincipal --show
Disable priority mode (return priority value to "0xFE"):
fabricprincipal --disable
Re-election of the "Principal" switch in the factory usually occurs in cases of turning off the current main switch, connecting a new switch to the factory, disconnecting and connecting ISL (Inter-Switch Link) ports. Disabling (switchdisable) and enabling (switchenable) a switch with the "Subordinate" role usually does not lead to a factory rebuild, but to force this process, use:
fabricprincipal -f
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