In this article we will discuss LLDP, will make brief discussion on LLDP, last article we discuss about LocalTalk.

The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol used by network devices for advertising their identity, capabilities, and neighbors on a local area network based on IEEE 802 technology, principally wired Ethernet.

To support non-Cisco devices and to allow for interoperability between other devices, the switch supports the IEEE 802.1AB Link Layer Discovery Protocol (LLDP). LLDPis a neighbor discovery protocol that is used for network devices to advertise information about themselves to other devices on the network.

LLDP is enabled by default on all supported interfaces to send and to receive LLDP packets. The frame contains the device’s destination MAC address as a multicast address that is not forwarded outside a network, assuming 802.1D compliance. LLDP supports a set of attributes that it uses to learn information about neighbor devices. These attributes have a defined format known as a Type-Length-Value (TLV). LLDP supported devices can use TLVs to receive and send information to their neighbors.

LLDP for Media Endpoint Devices (LLDP-MED) is an enhancement to LLDP that operates between endpoint devices such as IP phones and network devices such as switches. It specifically provides support for voice over IP (VoIP) applications and provides additional TLVsLLDP-MED supports below TLVsLLDP-MED capabilities TLV.


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