Lldp; Overview - HP 7102dl - ProCurve Secure Router Configuration Manual

Procurve secure router 7000dl series - advanced management and configuration guide

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Link Layer Discovery Protocol

Routing protocols allow routers to learn about each other dynamically as a

network expands and changes. However, these protocols run over Layer 3 of

the Open Systems Interconnection (OSI) model. Devices such as switches,

which operate on Layer 2, do not participate.

Networks expand all the time; switches are moved, and new ones are added.

Devices need to stay up to date on these changes. Link Layer Discovery

Protocol (LLDP), which runs over OSI Layer 2, allows locally attached devices

in a network, such as switches and routers, to advertise information about

themselves to listening devices. (See Figure 14-1.) Because devices continu-

ally broadcast and listen for LLDP messages, they can discover when a new

device is added or one removed. In this way, they maintain an accurate picture

of a dynamic network.

LLDP

Figure 14-1. LLDP

LLDP functions over any Data Link Layer network. Nodes transmit informa-

tion about themselves and listen for information about the devices on each

connection. With this information, they compile a picture of the network and

of the neighbors that they can reach.

Nodes identify neighbors according to the information (such as MAC address

and system name) they receive in LLDP messages. LLDP messages also

include a network address where a management process such as a Simple

Network Management Protocol (SNMP) server can reach the endpoint.

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