H12-351: HCIE-WLAN (Written)

In priority mode, a recovered original active link with higher priority triggers revertive switching only after 20 Echo intervals, preventing frequent switchovers during network flapping.

In dual-link HSB, the AP periodically sends CAPWAP Echo messages to the active and standby WACs for heartbeat detection and tunnel-status monitoring.

Radio calibration dynamically optimizes channels and transmit power among APs managed by the same controller, which is suited to a conventional enterprise office WLAN with stable, continuous AP coverage. It does not take effect on radios configured for WDS or Mesh services, and Huawei recommends automatic radio calibration for coverage scenarios other than high-density scenarios.

EAP relay transparently carries EAP packets inside RADIUS packets, leaving their EAP contents unprocessed; it simplifies access-device processing, supports multiple EAP methods, and requires an EAP-capable, sufficiently capable RADIUS server. EAP termination instead parses the client’s EAP packets and encapsulates the authentication information in standard RADIUS packets, using PAP or CHAP toward the RADIUS server; it supports only MD5-Challenge EAP authentication in this context.

EAPoL encapsulates EAP packets between the client and access device over a wired or wireless LAN. EAPoR encapsulates EAP packets in RADIUS for communication between the access device and authentication server. EAP-TLS is an authentication method, whereas EAP alone is the underlying authentication framework.