LLDP it’s a nonproprietary protocol that works at layer 2. It is an open IEEE-standard
802.1AB. LLDP is an alternative to CDP. LLDP runs over the data link layer and it collects
information about the neighboring devices. This information will help us in troubleshooting
and documentation. LLDP and Cisco CDP work similarly but the big difference is that LLDP
is a standard while CDP is a Cisco proprietary.
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