CISC-RT-000360 - The Cisco perimeter switch must be configured to have Link Layer Discovery Protocol (LLDP) disabled on all external interfaces.

Information

LLDP is a neighbor discovery protocol used to advertise device capabilities, configuration information, and device identity. LLDP 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 LLDP 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.

Solution

Disable LLDP transmit on all external interfaces as shown in the example below:

SW1(config)#int g0/1
SW1(config-if)#no lldp transmit

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS_Switch_Y24M07_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7(11), CAT|III, CCI|CCI-002403, Rule-ID|SV-220449r856240_rule, STIG-ID|CISC-RT-000360, STIG-Legacy|SV-110759, STIG-Legacy|V-101655, Vuln-ID|V-220449

Plugin: Cisco

Control ID: 657bd3d6c7fdfe5ded335f0ab96a398e5ba9be61af2a8a68db40ff7f3f94da4a