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

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-221096CISC-RT-000360SV-221096r999705_ruleCCI-002403low
Description
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.
STIGDate
Cisco NX OS Switch RTR Security Technical Implementation Guide2026-03-04

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-03Boundary Protection
0.50
NET-04.1Deny Traffic by Default & Allow Traffic by Exception
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CM-6Configuration Settings
1.00
SC-24Fail in Known State
1.00
SC-47Alternate Communications Paths
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00
CCI1 mapping
CCI-002403
1.00

Details

Check Text (C-221096r999705_chk)

Step 1: Verify LLDP is not enabled globally via the command feature lldp. By default the LLDP feature is not enabled. If LLDP is enabled, proceed to Step 2. Step 2: Verify LLDP is not enabled on any external interface as shown in the example below: interface Ethernet2/2 description link to DISN no switchport no lldp transmit Note: LLDP is enabled by default on all interfaces once it is enabled globally; hence the command lldp transmit will not be visible on the interface configuration. If LLDP transmit is enabled on any external interface, this is a finding.

Fix Text (F-22800r409778_fix)

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