From Firewall Security Technical Implementation Guide - Cisco
Part of The OOBM interface not configured correctly.
The OOBM access switch will connect to the management interface of the managed network elements. The management interface of the managed network element will be directly connected to the OOBM network. An OOBM interface does not forward transit traffic; thereby, providing complete separation of production and management traffic. Since all management traffic is immediately forwarded into the management network, it is not exposed to possible tampering. The separation also ensures that congestion or failures in the managed network do not affect the management of the device. If the OOBM interface does not have an IP address from the managed network address space, it will not have reachability from the NOC using scalable and normal control plane and forwarding mechanisms.
The managed network element’s OOBM interface must be configured with an IP address from the address space belonging to the OOBM network. After determining which interface is connected to the OOBM access switch, review the managed device configuration and verify that the interface has been assigned an address from the local management address block. In this example, that is 10.1.1.0/24. interface Ethernet0/2 nameif Management security-level 90 ip address 10.1.1.23 255.255.255.0 management-only The 5510 and higher ASA appliance includes a dedicated management interface called Management 0/0, which is meant to support traffic to the security appliance. The management interface is a Fast Ethernet interface and is specified as management0/0. However, you can configure any interface to be a management-only interface using the management-only command. Furthermore, you can disable management-only mode for the Management 0/0 interface so that traffic can pass through just like any other interface. Regardless, of which interface is being used as the management interface, verify that the management-only command is specified.
Configure the managed network element’s OOBM interface with an IP address from the address space belonging to the OOBM network.
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