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Chapter 3: Stacking
38
manually configured as the Stacking Master, the manually configured
member is elected Stacking Master.
If two Master-enabled units are present and neither has been manually
configured as the Stacking Master, the one with the longer up-time is
elected Stacking Master.
If the two Master-enabled stacking members are the same age, Unit 1 is
elected Stacking Master.
Two stacking member are considered the same age if they were inserted
within the same ten minute interval.
For example, if Stack member 2 is inserted in the first minute of a ten-
minute cycle, and Stack member 1 is inserted in fifth minute of the same
cycle, the units are considered the same age. If there are two Master-
enabled units that are the same age, then Unit 1 is elected Stacking
Master.
The Stacking Master and the Secondary Master maintain a Warm
Standby. The Warm Standby ensures that the Secondary Master takes
over for the Stacking Master if a failover occurs. This guarantees that the
stack continues to operate normally.
During the Warm Standby, the Master and the Secondary Master are
synchronized with the static configuration only. When the Stacking Master
is configured, the Stacking Master must synchronize the Secondary
Master. The Dynamic configuration is not saved, for example, dynamically
learned MAC addresses are not saved.
Each port in the stack has a specific Unit ID, port type, and port number,
which are part of both the configuration commands and the configuration
files. Configuration files are managed only from the device Stacking
Master, including:
Saving to the Flash
Uploading configuration files to an external TFTP Server
Downloading configuration files from an external TFTP Server
Whenever a reboot occurs, topology discovery is performed, and the
Master learns all units in the stack. Unit IDs are saved in the unit and are
learned through topology discovery. If a unit attempts to boot without a
selected Master, and the unit is not operating in stand-alone mode, the
unit does not boot.
Configuration files are changed only through explicit user configuration.
Configuration files are not automatically modified when:
Units are added
Units are removed