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ENWLSD 300-425 CH09
Designing High Availability
6
Computer Science
Undergraduate 3
01/12/2022

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Cards

Term
AP Fallback
Definition
An AP can try to rejoin its primary controller at any time it becomes available, rather than staying with the secondary or tertiary controller after a controller failure.
Term
AP prioritization
Definition
AP can be assigned a priority value (low, medium, high, critical) to be used when joining a controller. Higher-priority ones are admitted to the controller ahead of ones with lower priorities.
Term
N+1 redundancy
Definition
High availability offered by N number of active controllers plus one idle standby controller.
Term
N+N redundancy
Definition
High availability offered by N number of active controllers. The AP load is distributed across the active controllers, removing the need for an additional backup controller.
Term
N+N+1 redundancy
Definition
High availability offered by N number of active controllers plus one idle standby controller.
Term
SSO
Definition
High availability offered by two controllers configured as a failover pair. One controller is active and supports the AP and client load, while the other controller is a hot standby. Stateful information about APs and clients in the RUN state is synchronized between the active and hot standby units for efficient failover.
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