lldp message-transmission interval

The LLDP transmission interval must be set properly and adjusted according to network loads.

• A large value reduces the LLDP packet transmission frequency. This helps save system resources. However, if the value is too large, the device cannot notify neighbors of its status in a timely manner, and the NMS cannot discover the network topology changes in real time.
• A short interval increases the LLDP packet transmission frequency and enables the NMS to discover network topology changes in real time. However, if the interval is too short, LLDP packets are exchanged frequently, increasing the system load.
• The default value is recommended.

Both the LLDP packet sending interval and delay should be shorter than the time that device information is held in neighbors (TTL). Otherwise, the neighbor device cannot receive the LLDP packets sent by the FW after the information about the FW ages on the neighbor device. And TTL = Min (65535, (interval x hold)), so when adjusting the value of Interval between sending LLDP packets, delay in sending LLDP packets, or hold time multiplier of device information on neighbors, you should consider the other values because they are restricted.