Netgear XCM8806 Chassis User Manual - Page 150
LLDP, Overview, LLDP Packets, Transmitting LLDP Messages, Managing LLDP, Supported TLVs
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6. LLDP 6 This chapter includes the following sections: • Overview on page 150 • LLDP Packets on page 152 • Transmitting LLDP Messages on page 153 • Receiving LLDP Messages on page 154 • Managing LLDP on page 155 • Supported TLVs on page 156 • Configuring LLDP on page 164 • Displaying LLDP Settings on page 170 Overview The software supports the Link Layer Discovery Protocol (LLDP). LLDP is a Layer 2 protocol (IEEE standard 802.1ab) that is used to determine the capabilities of devices such as repeaters, bridges, access points, routers, and wireless stations. LLDP support enables devices to advertise their capabilities and media-specific configuration information and to learn the same information from the devices connected to it. The information is represented in Type Length Value (TLV) format for each data item. The 802.1ab specification provides detailed TLV information. The TLV information is contained and transmitted in an LLDP protocol data unit (LLDPDU). Certain TLVs are mandatory and are always sent after LLDP is enabled; other TLVs are optionally configured. LLDP defines a set of common advertisement messages, a protocol for transmitting the advertisements, and a method for storing the information contained in received advertisements. The switch can receive and record certain TLVs but not transmit these TLVs; they are TLVs originating from the power over Ethernet (PoE) powered device (PD) connected to a port and certain inventory management TLVs. LLDP provides a standard method of discovering and representing the physical network connections of a given network management domain. It works independently. The LLDP neighbor discovery protocol allows you to discover and maintain accurate network topologies in a multivendor environment. Chapter 6. LLDP | 150
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