For IPsec VPN reliability, Option B enhances failover speed by adding a backup tunnel and tuning tunnel monitoring. Reducing the interval (e.g., to 2 seconds) and threshold (e.g., to 3 retries) ensures quick detection and failover to the backup tunnel, minimizing disruption.
Option A (HA and rekey interval) addresses session continuity, not tunnel failure detection. Option C (disable monitoring) risks missing real failures. Option D (Fail Over profile) helps but lacks the proactive tuning of B. Documentation recommends this approach.
[Reference: PAN-OS 11.2 Administrator’s Guide, "VPNs" section - Tunnel Monitoring Configuration., , , , ]
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