From Layer 2 Switch Security Technical Implementation Guide - Cisco
Part of Mgmt VLAN does not have correct IP address
If the management systems reside within the same layer 2 switching domain as the managed network elements, then separate VLANs will be deployed to provide separation at that level. In this case, the management network still has its own subnet while at the same time it is defined as a unique VLAN.
Review the switch configuration and verify that the management VLAN has been assigned an IP address from the management network address block. Following is an example for a Cisco Catalyst switch: interface VLAN 10 description Management VLAN ip address 10.1.1.10 255.255.255.0 Note: The IP address of the switch can be accessed only by nodes connected to ports that belong to the management VLAN.
Configure the management VLAN with an IP address from the management network address block.
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