Which command is used to enable LLDP globally on a Cisco IOS ISR?
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A. B. C. D. E.A
Link Layer Discovery Protocol (LLDP) is an industry standard protocol that allows devices to advertise, and discover connected devices, and there capabilities
(same as CDP of Cisco). To enable it on Cisco devices, we have to use this command under global configuration mode:
Sw(config)# lldp run
The correct answer to the question is A. "lldp run".
The Link Layer Discovery Protocol (LLDP) is a vendor-neutral protocol used to discover and advertise information about neighboring network devices. It enables network devices to exchange information such as device type, capabilities, and system name. This information is used by network administrators to manage and troubleshoot their networks.
To enable LLDP on a Cisco IOS ISR (Integrated Services Router), the "lldp run" command is used. This command enables the LLDP process globally on the router, allowing it to send and receive LLDP packets on all interfaces. LLDP packets are sent every 30 seconds by default, and the information advertised by the router includes the device ID, port ID, and capabilities.
In contrast, the "lldp transmit" command is used to enable LLDP packet transmission on a specific interface, while "lldp enable" is not a valid command on Cisco IOS. "cdp run" and "cdp enable" are commands used to enable Cisco Discovery Protocol (CDP), a Cisco proprietary protocol that provides similar functionality to LLDP. However, the question specifically asks for the command used to enable LLDP, not CDP.
In summary, the correct command to enable LLDP globally on a Cisco IOS ISR is "lldp run".