Huawei's Intelligent Energy Saving Solution (Zero-bit, Zero-watt) uses AI to transition APs between states based on traffic demand. In this logic:
* Energy-saving APs (A): Are those identified by the system to enter a deep sleep/hibernation mode when traffic is low.
* Assurance APs (D): Remain active to provide basic signal coverage and "listen" for wake-up triggers.
* Leader APs (C): Function as the local controller (in small-scale deployments) to coordinate these states.
IoT APs (B) , while they support converged services, are not defined as a specific functional role within the energy-saving state-switching algorithm itself, as IoT devices often require persistent, low-power connectivity that differs from standard Wi-Fi user traffic patterns.

Free mobility enables identity-based policy enforcement so users maintain consistent access permissions and network policies regardless of their physical location or IP address changes.

Stacking (iStack) is a key reliability technology for the access and aggregation layers. By connecting multiple switches into a single logical unit, the network gains device-level redundancy . If one switch in the stack fails, the other member switches continue to forward traffic. Furthermore, it allows for the use of Inter- device Eth-Trunk (link aggregation across different physical switches), which prevents loops without the need for STP, leading to faster convergence and higher network availability.

A functional Huawei SD-WAN network requires three fundamental pillars:
* CPE (A): The physical or virtual edge device at the branch/HQ.
* RR (B): The control plane component that reflects routes between CPEs.
* Controller (C): The management plane (iMaster NCE-Campus) for orchestration and policy deployment.
The Analyzer (D) (CampusInsight) is an optional component used for advanced AI-driven O & M and troubleshooting, but it is not strictly required to establish the SD-WAN network itself.

VRRP HSB (Hot Standby) is a redundancy mechanism for routers, not WLANs. WLAN redundancy features include service holding when the CAPWAP link disconnects, AC clustering, and dual-link HSB, which ensure continuous wireless service and controller failover.