Stack State Machine - Huawei S Series White Paper

S Series Switches
iStack Technology White Paper
ProtoType
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2.3 Stack State Machine

Stacked devices run in one of the following states: Init, Electing, Collecting, and Running, as
shown in Figure 2-2.
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Figure 2-2 Stack state machine
Issue 01 (2013-05-25)
Packet Type
HeHuan Info
Modify Config
Load
Reset
Init: After a stacked device starts, it enters the Init state. After local data is initialized, it
enters the Electing state.
Electing: In this state, stacked devices compete to determine the master and slave roles.
Collecting: The master device collects stack topology information and assigns stack IDs
to other devices.
Running: The stack is running stably. Stacked devices may still be starting or have
completed configuration restoration.
CollectionFinish/
MasterDown/
MasterChange
SystemStart
Init
ElectionFinish/
CollectionFinish/
MasterDown/
MasterChange
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description
It is not in use currently.
Modifies the configuration.
Loads the system software.
Resets a slave switch.
ElectionFinish/
MasterDown/
MasterChange
ElectionFinish
Electing
StandAlone
2 Technology Description
Collecting
CollectionFinish/
StandAlone
Running
StandAlone
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