VMware-Recommended Option for Upstream Failure Detection

A.

The goal of enabling upstream failure detection for networking is to ensure that the vSphere hosts are aware of network failures and can failover to an alternate path. Link state tracking is a feature that is not supported in some environments, which means that another method must be used to detect network failures.

Out of the given options, the VMware-recommended option is to satisfy prerequisites and enable Beacon probing, which is option A.

Beacon probing is a feature in vSphere that allows for the detection of upstream network failures without relying on link state tracking. It does this by sending periodic beacon packets across the network to detect failures. When a failure is detected, vSphere can automatically failover to an alternate path.

To enable beacon probing, certain prerequisites must be met, such as configuring redundant network adapters and setting up virtual switches. Once these prerequisites are met, beacon probing can be enabled on a per-virtual switch basis.

Option B, enabling explicit failover order and ensuring failback is selected, is not relevant to enabling upstream failure detection for networking. Explicit failover order is a feature that allows for the customization of the order in which network adapters are used for failover. Failback is a separate feature that allows for automatic return to the original adapter when it is available again.

Option C, enabling explicit failover order and ensuring notify switches is selected, is also not relevant to enabling upstream failure detection for networking. Notify switches is a feature that sends notifications to physical switches when a failover occurs. Explicit failover order is the same as option B.

Option D, configuring a port-channel with LACP, is not recommended by VMware for enabling upstream failure detection for networking. Port-channeling is a technique used to aggregate multiple physical links into a single logical link for increased bandwidth and redundancy. LACP is a protocol used to negotiate the configuration of port-channeling. While this can be a useful technique for increasing network availability, it is not directly related to upstream failure detection.