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Difficulty: MediumLayer 2 Discovery Protocols (CDP and LLDP)

A network administrator is troubleshooting neighbor discovery between a Cisco Catalyst switch and an adjacent third-party switch. Global LLDP is enabled on the Cisco switch using the 'lldp run' command. The Cisco switch successfully detects the neighbor on interface GigabitEthernet0/1, but the neighbor does not receive any discovery frames from the Cisco switch. Which interface configuration command must be applied to GigabitEthernet0/1 to resolve this issue?

  1. lldp transmitAnswer
  2. B
    cdp run
  3. C
    lldp holdtime 120
  4. D
    switchport trunk native vlan 1

Answer

The command 'lldp transmit' applied under interface configuration mode enables outbound LLDP frame transmission on that specific interface.
On Cisco Catalyst switches, LLDP allows transmit and receive functions to be enabled or disabled independently on each interface. The 'lldp transmit' command under interface mode activates outbound frame transmission so neighboring devices can discover the local switch.

Step-by-Step Solution

1
Analyze the reported symptom.
The local Cisco switch receives neighbor information but does not transmit LLDP frames on GigabitEthernet0/1.
LLDP allows granular directional control (transmit and receive) per interface.
2
Identify the command controlling directional LLDP transmission.
Entering interface configuration mode and executing 'lldp transmit' enables outbound advertisement frames.
When global LLDP is enabled ('lldp run'), individual interfaces can still have transmission disabled ('no lldp transmit').

Key Concept

LLDP Interface Directional Control Commands
Estimated Time:1m 0s
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Topics

Layer 2 Discovery Protocols (CDP and LLDP)

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