Which command checks the time difference in a HA pair?

The command that checks the time difference in a High Availability (HA) pair is "diagnose sys ha dump-by vlan." This command provides detailed information about the HA configuration and the synchronization status between the two units. Specifically, it includes data regarding the time differences that can indicate issues with HA synchronization or potential failover problems.

By running this command, network administrators can gain insights into the current state of the HA pair, including critical metrics like the time difference, which is crucial for maintaining system reliability and consistency between the active and standby units. This command helps to diagnose potential issues related to time synchronization that may affect the HA functionality.

Other commands listed do not specifically provide information about time differences in HA pairs. For instance, commands related to OSPF database or interface information focus on routing protocols and their operational status rather than HA time synchronization data. The command that checks HA status may provide some relevant details, but it does not delve as deeply into the specific time differences as the correct command does.