PLANET SGSW-24040 - Manual (Page 327)

User’s Manual of SGSW-24040 / 24240 Series
327
configuration, except for the Switch ID.
3. Switches without an assigned Switch ID can only be assigned to any
unused ID.
4. When assigning a Switch ID of an inactive switch to a new switch, the
new switch will inherit the former's configuration (see "Replacing a
Switch" above).
5. Deleting a switch will remove any configuration pertaining to it.
6. Deleting an active switch will leave it with an unassigned Switch ID until
rebooted or manually assigning a Switch ID.
•
Master Capable Indicates whether a switch is capable of being master. An unmanaged switch, for
example, will not be Master Capable.
•
Master Priority The priority that the switch has in the master election process.
The smaller the priority, the more likely the switch will become master during the
master election process.
• Switch Type
The product name of the switch.
• Start Master Election
By checking this option, the "Save" operation will also start the master election
process.
This is done by clicking "Start Master Election", followed by "Save". This causes
the first two criteria to be ignored, thereby basing master election only on master
priority and MAC address. When master election is enforced, the first two criteria
are ignored for a period of 10-15 seconds.
Within a managed stack, one master switch (or just "master") must be elected.
Any switch not being master is a slave switch (or just "slave").
To elect a master, the following criteria are evaluated sequentially:
1. If any switch already claims to have been master for more than 30
seconds, then that switch will become master.
2. If multiple switches claim to have been master for more than 30
seconds, then the switch which has been master for the longest period
of time will become master.
3. The switch with the smallest master priority.
4. The switch with the smallest MAC address.
The above algorithm ensures that once a master has been elected and has been
master for more than 30 seconds, it will remain master. However in some cases
the user may want to enforce a new master election. This is done by clicking
"Start Master Election", followed by "Save". This causes the first two criteria to be
ignored, thereby basing master election only on master priority and MAC
address. When master election is enforced, the first two criteria are ignored for a
period of 10-15 seconds. On the Stack State Monitor web page, this is shown by