Explanation:
To prevent a timeout and loss of communication during an external switch firmware upgrade, the customer should configure the LACP failover trigger within the uplink set. By setting the LACP failover trigger to " All active uplinks transition to offline, " the configuration ensures that the traffic will be redirected to available uplinks in the event of an uplink failure or during the upgrade process, maintaining communication and preventing timeouts.
Reference: HPE Synergy Configuration Guide