Detections
Analytics

1.27 CISC-RT-000360

Information

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

GROUP ID: V-220449
RULE ID: SV-220449r856240

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://workbench.cisecurity.org/benchmarks/26601

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

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

Plugin: Cisco

Control ID: 85293c2f175f7a81174bdc0e3ea87108b8e30efb802cf92d57b2b355e0b98724