An engineer is implementing a Cisco ACI environment that consists of more than 20 servers. Two of the servers support only Cisco Discovery Protocol with no order link discovery protocol. The engineer wants the servers to be discovered automatically by the Cisco ACI fabric when connected. Which action must be taken to meet this requirement?

In Cisco ACI, interfaces use the default interface policy group and its associated default policies (where CDP is disabled and LLDP is enabled by default) unless explicitly configured otherwise. To enable CDP for only two specific servers without altering the fabric-wide default, the engineer must configure a specific CDP interface policy with the admin state set to "enabled". This explicitly configured policy is then applied to the specific leaf switch interfaces via an interface policy group and interface profile. In the ACI policy resolution model, explicitly applied interface policies have a higher order of precedence (higher priority) than default policies, effectively overriding the default behavior for those specific ports so the servers can be discovered.

Option A: ACI does not use a dedicated "override policy" object for interface discovery protocols; it relies on explicit policy assignment taking precedence over defaults.
Option C: Explicitly configured interface policies have a higher order of precedence (priority) over default policies, not a lower order.
Option D: Disabling LLDP on an interface profile does not automatically enable CDP; CDP must be explicitly enabled through a dedicated CDP interface policy.

1. Cisco Systems, Inc. Cisco APIC Basic Configuration Guide, Release 5.2(x). Chapter: "ACI Policy Model", Section: "Interface Policies and Policy Groups". Document ID: 10/10/2021.

2. Cisco Systems, Inc. Cisco Application Centric Infrastructure Fundamentals. Chapter: "Policy Model", Section: "Policy Resolution and Precedence". (Details how explicitly bound policies take higher precedence over default policies in the Management Information Tree).