Detections
Analytics

1.23 CISC-RT-000360

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Information

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

GROUP ID: V-221096
RULE ID: SV-221096r999705

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://workbench.cisecurity.org/benchmarks/22581

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7(11), CAT|III, CSCv7|12.4, Rule-ID|SV-221096r999705_rule, STIG-ID|CISC-RT-000360, Vuln-ID|V-221096

Plugin: Cisco

Control ID: 56688d6d86477154761cc1d745f28e3d0cea5aa7d8bb3c07a06980be8984c023