In what situation are power alarms generated on the S5700

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When the S5700 has only one power input, the following alarm is generated:
display alarm urgent
Alarm:

Alarm Slot Date Time(DST) Location
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Power abnormal 1 2008/10/01 00:00:48 Slot 0 When the S5700 has two power inputs, no alarm is generated.
display alarm urgent
Alarm:

Alarm Slot Date Time(DST) Location
---------------------------------------------------------------------------
When one of the power inputs is cut off, a "power abnormal" alarm is generated. When this power input is recovered, a "power resume" alarm is generated.
display alarm urgent
Alarm:

Alarm Slot Date Time(DST) Location
---------------------------------------------------------------------------
Power resume 1 2008/10/01 00:02:54 Slot 0
Power abnormal 1 2008/10/01 00:02:49 Slot 0
Power resume 1 2008/10/01 00:02:21 Slot 0
Power abnormal 1 2008/10/01 00:02:08 Slot 0

Other related questions:
What can I do if the U1980 generates the power supply alarm tone
The power distribution unit of the U1980 consists of one power switch, three power module slots, and one alarm tone mute button. An alarm tone is generated when the three power modules are not fully configured. Press the alarm tone mute button to mute the alarm generated.

In which situation is a DHCP snooping binding entry generated
Information about generating DHCP snooping binding entries is as follows: 1. When the dhcp snooping enable command is not run on the user-side interface and the network-side interface is not configured as a trust interface, users can go online, but no DHCP snooping binding entry is generated. 2. When the dhcp snooping enable command is not run on the user-side interface and the network-side interface is configured as a trust interface, users can go online, but no DHCP snooping binding entry is generated. 3. When the dhcp snooping enable command is run on the user-side interface and the network-side interface is not configured as a trust interface, users cannot go online, but no DHCP snooping binding entry is generated. 4. When the dhcp snooping disable command is run on the user-side interface, users can go online, but no DHCP snooping binding entry is generated no matter whether the network-side interface is configured as a trust interface. 5. When the dhcp snooping enable command is run on the user-side interface and both user-side and network-side interfaces are configured as trust interfaces, users can go online, but no DHCP snooping binding entry is generated. If the DHCP snooping function has been enabled but no DHCP snooping entry is generated, you can check device configuration in the preceding aspects.

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