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Difficulty: EasyLayer 2 Discovery Protocols (CDP and LLDP)

A network administrator is deploying non-Cisco VoIP IP phones connected to a Cisco Catalyst switch. While Cisco Discovery Protocol (CDP) is enabled by default, the non-Cisco devices require Link Layer Discovery Protocol (LLDP) to receive VLAN assignments and power settings. Which command must the administrator execute in global configuration mode to enable LLDP globally across the switch?

  1. lldp runAnswer
  2. B
    cdp run
  3. C
    lldp enable
  4. D
    lldp transmit

Answer

The command `lldp run` entered in global configuration mode enables LLDP globally across the Cisco switch.
The command `lldp run` is executed in global configuration mode to start the LLDP service switch-wide on Cisco devices. Once enabled globally, individual interfaces will transmit and receive LLDP advertisements.

Step-by-Step Solution

1
Identify the protocol requirement
LLDP (IEEE 802.1AB) is required for interoperability with non-Cisco devices.
CDP is Cisco-proprietary, whereas LLDP is an open standard supported across multi-vendor equipment.
2
Determine the global CLI configuration syntax for LLDP
The command to enable LLDP globally on Cisco IOS is `lldp run`.
In Cisco IOS/IOS-XE, global protocol enablement for LLDP follows the syntax `lldp run` (similar to `ip routing` or `cdp run`).

Key Concept

Global activation of LLDP on Cisco Catalyst switches
Estimated Time:45s
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Topics

Layer 2 Discovery Protocols (CDP and LLDP)

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