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Link Layer Discovery Protocol (LLDP) allows network devices to advertise their identity, capabilities, and to receive same information from neighbors on an local area network. Information can be requested from the device by services via SNMP.
Nodes may share information about:
- network device name;
- network device description;
- system capabilities (switching, routing, etc.);
- port name;
- port description;
- MTU;
- management IP - address;
- the last update of information time and time to livethe time during which the information will be saved (TTL).
Syntax:
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usage: lldp [IFNAME] { disable | { enable [ tx | rx | txrx ] }}
lldp [IFNAME] mgmtip IP [mgmtvid VID]
lldp [IFNAME] [-]vlan VID NAME
lldp [IFNAME] report | local
lldp forward { disable | enable } |
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| Parameters | Description |
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| [IFNAME] | Name of the network interface to which parameters are referred. | { disable | { enable [ tx | rx | txrx ] }} | Allows to control the LLDP messages exchange, by default this function is enabled for both incoming and outgoing messages.
- "enable" – enable the LLDP messages exchange:
- "tx" – outgoing LLDP messages only no incoming messages are allowed;
- "rx" – incomingLLDP messages only no outgoing messages are allowed;
- "txrx" – both incoming and outgoing messages.
- "disable" – disable the LLDP messages exchange.
| mgmtip IP [mgmtvid VID] | Set the management IP - address. - "mgmtvid VID" –VLAN ID which contains the management IP address, if the address is set manually.
| [-]vlan VID NAME | Set the VLAN name. Some systems are operating with VLAN names to automatically configure their services. | report | local | - "report" – shows the information device receives from its neighbors.
- "local" – shows information device sends to its neighbors.
| forward { disable | enable } | Enables / disables packet switching to other ports.The standard protocol LLDP does not allow such an opportunity. By default, this function is disabled.
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