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300-425 · Question #113

Two Cisco 5520 Wireless LAN Controllers are managing all access points throughout the network. The WLCs are in different locations to provide geographical redundancy. A mobility group has been…

The correct answer is C. Enable AP fallback globally on the WLC. AP fallback must be globally enabled on the WLC so that APs automatically return to their statically configured primary controller once it recovers from an outage.

WLAN High Availability

Question

Two Cisco 5520 Wireless LAN Controllers are managing all access points throughout the network. The WLCs are in different locations to provide geographical redundancy. A mobility group has been configured on both WLCs and has a UP status on both controllers. The APs in location A are statically configured to use controller A as the primary and controller B as the secondary If the WLC in location A goes offline the APs successfully join the WLC m location B, but they do not fail over to their primary configured controller. Which configuration task fixes this issue?

Exhibit

300-425 question #113 exhibit

Options

  • AConfigure the WLC in location A as primary using the CAPWAP AP Controller IP Address
  • BUse DHCP Option 43 and specify WLC in location A as primary.
  • CEnable AP fallback globally on the WLC.
  • DChange the AP Failover Priority to critical

How the community answered

(47 responses)
  • A
    4% (2)
  • B
    9% (4)
  • C
    70% (33)
  • D
    17% (8)

Why each option

AP fallback must be globally enabled on the WLC so that APs automatically return to their statically configured primary controller once it recovers from an outage.

AConfigure the WLC in location A as primary using the CAPWAP AP Controller IP Address

The CAPWAP AP Controller IP Address setting is used for initial AP-to-controller discovery and joining, and has no effect on whether an AP returns to its primary after failover recovery.

BUse DHCP Option 43 and specify WLC in location A as primary.

DHCP Option 43 provides controller IP addresses during the AP discovery phase and plays no role in controlling failback behavior once an AP is already joined to a secondary controller.

CEnable AP fallback globally on the WLC.Correct

AP fallback is a global WLC setting that instructs APs to monitor their configured primary controller and reconnect to it once it comes back online after a failure. Without this feature enabled, APs remain on the secondary controller indefinitely even after the primary recovers. Enabling AP fallback globally ensures the expected failback behavior described in the scenario.

DChange the AP Failover Priority to critical

AP Failover Priority determines the order in which APs are allowed to join an overloaded backup controller during a failover event, not whether they return to their primary controller after it recovers.

Concept tested: AP fallback to primary controller configuration

Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/configuring_aps.html

Topics

#AP fallback#WLC redundancy#primary controller#failover configuration

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