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:

SW2(config)# int e2/2
SW2(config-if)# no lldp transmit
SW2(config-if)# end

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_NX-OS_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-221096r999705_rule, STIG-ID|CISC-RT-000360, STIG-Legacy|SV-111011, STIG-Legacy|V-101907, Vuln-ID|V-221096

Plugin: Cisco

Control ID: 794591fc16c12a213f70b04fe37f9b1e1a2007c331be375239a41c6ace9144a8