Modules operating in nonstop mode

When a switch is in standalone mode and OSPF routing is enabled, the "empty Hello list" is transmitted whenever the boot or reload command is executed.

When the switch is operating in nonstop switching mode (redundant), and a single module is being reloaded or booted, the standby module notifies neighboring switches of the management module failover. If the failover fails, the "empty Hello list" is transmitted before the switch is rebooted.

When a switch is operating with multiple management modules in warm standby mode, the "empty Hello list" is sent when a reload or boot command is executed. The standby management module sends out OSPF Hello packets after becoming the active management module.