Does MAD need an IP address on the interfaces

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MAD does not need an IP address on the interfaces, but also it cannot work on management interfaces.

Other related questions:
Time when the Trap IP address is configured
After the Trap IP address management is set, the alarms are sent to the specified application server or maintenance terminal. The ISM provides the function of setting the Trap IP address for the alarms. Through this function, the alarms about the storage devices managed by the ISM client can be reported to another network management system (NMS) or a device with the specific IP address. If the alarm is reported in SNMP mode, the trap IP address needs to be set.

MAD can be configured on layer 2 interface
MAD can be only configured on Layer 2 interfaces and MAD packets are BPDU packets. Because the Management interface is a Layer 3 interface andcannot work at Layer 2, MAD cannot be configured.

Whether the physical IP address of an upstream or downstream interface needs to be set after a virtual IP address of the VRRP group is set on this interface
Yes.

Whether the IP address of the IPMI interface can be customized during the deployment of OceanStor 9000
Yes, but you are advised to plan consistent IP addresses for the IPMI interface of each node for the ease of remote node management. In addition, you are advised to plan all IP addresses in a management network segment that is usually a private network segment. The private network segment has no requirements on the number of IP addresses and allows requests for application.

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