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The Cisco switch must be configured to have Gratuitous ARP disabled on all external interfaces.


Finding ID Version Rule ID IA Controls Severity
V-220998 CISC-RT-000150 SV-220998r856403_rule Medium
A gratuitous ARP is an ARP broadcast in which the source and destination MAC addresses are the same. It is used to inform the network about a host IP address. A spoofed gratuitous ARP message can cause network mapping information to be stored incorrectly, causing network malfunction.
Cisco IOS XE Switch RTR Security Technical Implementation Guide 2023-09-13


Check Text ( C-22713r408788_chk )
Review the configuration to determine if gratuitous ARP is disabled. The following command should not be found in the switch configuration:

ip gratuitous-arps

Note: With Cisco IOS, Gratuitous ARP is enabled and disabled globally.

If gratuitous ARP is enabled on any external interface, this is a finding.
Fix Text (F-22702r408789_fix)
Disable gratuitous ARP as shown in the example below:

SW1(config)#no ip gratuitous-arps