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The Cisco perimeter switch must be configured to have Cisco Discovery Protocol (CDP) disabled on all external interfaces.


Finding ID Version Rule ID IA Controls Severity
V-221017 CISC-RT-000370 SV-221017r856412_rule Low
CDP is a Cisco proprietary neighbor discovery protocol used to advertise device capabilities, configuration information, and device identity. CDP is media-and-protocol-independent as it runs over layer 2; therefore, two network nodes that support different layer 3 protocols can still learn about each other. Allowing CDP messages to reach external network nodes provides an attacker a method to obtain information of the network infrastructure that can be useful to plan an attack.
Cisco IOS XE Switch RTR Security Technical Implementation Guide 2023-09-13


Check Text ( C-22732r408845_chk )
Step 1: Verify if CDP is enabled globally as shown below:

cdp run

By default, CDP is not enabled globally or on any interface. If CDP is enabled globally, proceed to Step 2.

Step 2: Verify CDP is not enabled on any external interface as shown in the example below:

interface GigabitEthernet2
ip address z.1.24.4

cdp enable

If CDP is enabled on any external interface, this is a finding.
Fix Text (F-22721r408846_fix)
Disable CDP on all external interfaces via no cdp enable command or disable CDP globally via no cdp run command.