Basic Concepts
Stack technology involves the following key concepts:
Role
Switches that have joined a stack are member switches. Each member switch in a stack plays one of the following roles:Master switch
The master switch manages the entire stack. A stack has only one master switch.
Standby switch
The standby switch is the backup of the master switch. When the master switch fails, the standby switch takes over all services from the master switch. A stack has only one standby switch.
Slave switch
A slave switch forwards service traffic. The more slave switches in a stack, the higher forwarding performance the stack can provide. Apart from the master and standby switches, all the other switches in a stack are slave switches.
Stack ID
The stack ID of a member switch is the slot ID of the member switch within the logical switch. Each member switch in a stack must have a unique stack ID.
Stack priority
The stack priority of a member switch determines the role of the member switch in role election. A larger value indicates a higher priority and higher probability that the member switch will be elected as the master switch.
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