lldp message-transmission delay
Function
The lldp message-transmission delay command sets the LLDP packet transmission delay.
The undo lldp message-transmission delay command restores the default LLDP packet transmission delay.
By default, the LLDP packet transmission delay is 2 seconds.
Parameters
Parameter |
Description |
Value |
|---|---|---|
delay |
Specifies the LLDP packet transmission delay. |
The value is an integer ranging from 1 to 8192, in seconds. The default value is 2 seconds. The delay value depends on the interval value in lldp message-transmission interval. The delay value must be equal to or smaller than a quarter of the interval value. |
Usage Guidelines
Usage Scenario
There is a delay before the interface sends an LLDP packet to the neighbor when the device status changes frequently. After the LLDP packet transmission delay is set on the device, the LLDP-enabled interfaces send LLDP packets to neighbors after a delay (the delay is the same as or longer than the delay you specified). The interfaces may send LLDP packets at different time points.
If the device status changes frequently, extend the delay in preventing the device from frequently sending packets to the neighbors. A delay suppresses the network topology flapping.
Prerequisites
LLDP has been enabled globally using the lldp enable (system view) command.
Configuration Impact
The LLDP packet transmission delay must be set properly and adjusted according to network loads.
- A large value reduces the LLDP packet transmission frequency when the local device status frequently changes. 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 small value increases the LLDP packet transmission frequency and enables the NMS to discover network topology changes in real time when the local device status frequently changes. However, if the value is too small, LLDP packets are exchanged frequently, increasing the system load.
- The default value is recommended.
Precautions
- The value of delay ranges from 1 to 8192.
- The value of delay must be smaller than or equal to a quarter of interval. Therefore, if you want to set delay to be greater than a quarter of interval, first increase the interval value to four times the new delay value, and then increase the delay value.
If the interval value is smaller than four times the delay value, the system displays an error message when you run the undo lldp message-transmission delay command. To run the undo lldp message-transmission delay command in this case, increase the interval value to at least four times the delay value first.