Master Selection Process - Cisco SX350 Series Administration Manual

Managed switches

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Administration: Stack Management

Master Selection Process

Master Selection Process

Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x

The following shows a case where one of the duplicate units is renumbered. The one with the

lower MAC retains its unit ID (see

Duplication Between Two Units With Auto Number Unit ID

If a new stack has more than the maximum number of units, all extra units are shut down.

The master unit is selected from the master-enabled units (1 or 2). The factors in selecting the

master unit are taken into account in the following priority:

System Up Time—The master-enabled units exchange up-time, which is measured in

segments of 10 minutes. The unit with the higher number of segments is selected. If

both units have the same number of time segments, and the unit ID of one of the units

was set manually while the other unit's unit ID was set automatically, the unit with the

manually-defined unit ID is selected; otherwise the unit with the lowest unit ID is

selected. If both units IDs are the same, the unit with the lowest MAC address is

chosen. Note: The up time of the backup unit is retained when it is selected as master

in the switch failover process.

Unit ID—If both units have the same number of time segments, the unit with the

lowest unit ID is selected.

MAC Address—If both units IDs are the same, the unit with the lowest MAC address

Master Selection Process

for a description of this process).

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