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A switch can be added to a stack after being powered off or with power on. In Figure 2-5, the
new member switch is powered off before being added to the stack.
Figure 2-5 Adding a member switch
The process of adding a member switch is as follows:
The new switch is powered off, connected to the member switches of the stack through
stack cables, and restarted.
The new switch is elected as a slave switch after it starts, and roles of other member
switches in the stack remain unchanged.
After the election is complete, the master switch updates the topology information,
synchronizes the topology information to other switches, and assigns a stack ID to the
new member switch.
The new member switch updates its stack ID, registers with the master switch,
synchronizes the configuration with the master switch, and then enters the Running state.
Figure 2-6 shows how member switches exchange stack packets when a new member switch
is added to the stack.
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