Hitachi 220H Bios Manual page 56

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When the BMC network setting is changed and saved, the reflecting
time may take time for several tens of seconds until the setting is
reflected to the BMC. The BMC network can not be connected in this
time. The old value before setting may be displayed when confirming
the BMC network setting with the system BIOS setup menu.
In this case, restart the system unit again. Check the BMC network
setting and configuration if BMC network can not be connected after
restarting.
Setup for the BMC network settings is necessary when the remote

management function is used. See Hitachi Compute Rack
210H/220H Remote Management User's Guide.
The DHCP address has lease period. We recommend that only using

DHCP when setting up the system unit. Set disabled DHCP after
setting up the system unit, and then changes a static IP address.
System BIOS
Hitachi Compute Rack 210H/220H BIOS Guide