350-401 Question #1138: Real Exam Question with Answer & Explanation

Question

How does a WLC achieve stateful switchover for APs and clients?

Options

• AThe active WLC establishes a CAPWAP tunnel to the AP, and the standby WLC establishes a
• BThe active WLC establishes a CAPWAP tunnel with the AP, and the standby WLC copies the AP
• CThe active WLC establishes a CAPWAP tunnel with the AP and standby WLC to share the AP
• DThe active and standby WLCs establish separate CAPWAP tunnels to the AP.

Explanation

A WLC achieves stateful switchover by having the active WLC establish CAPWAP tunnels with APs and continuously synchronize AP and client state information with the standby WLC.

Common mistakes.

• A. The standby WLC does not establish its own CAPWAP tunnel to the AP initially; it receives state information from the active WLC to prepare for a failover.
• C. The active WLC does not establish a CAPWAP tunnel with the standby WLC to share AP state directly in the context of HA SSO; state is synchronized over a dedicated HA port/link.
• D. Only the active WLC establishes and maintains the CAPWAP tunnels to the APs in an SSO pair; if both established separate tunnels, it would not be a clean active/standby failover.

Concept tested. WLC Stateful Switchover (SSO) for HA

Reference. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/high_availability.html

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