a.The Global Setup tab

2.Global LLDP setup configuration items

Item

Description

LLDP Enable

Select from the drop-down list to enable or disable global LLDP.

 

 

 

Select from the drop-down list to enable or disable CDP compatibility of LLDP.

 

IMPORTANT:

 

∙ To enable LLDP to be compatible with CDP on a port, you must set the CDP work

CDP Compatibility

mode (or the CDP operating mode) on the port to TxRx in addition to enabling

 

CDP compatibility on the Global Setup tab.

 

∙ As the maximum TTL allowed by CDP is 255 seconds, you must ensure that the

 

product of the TTL multiplier and the LLDPDU transmit interval is less than 255

 

seconds for CDP-compatible LLDP to work properly with Cisco IP phones.

 

 

Fast LLDPDU Count

Set the number of LLDPDUs sent each time fast LLDPDU transmission is triggered.

 

 

 

Set the TTL multiplier.

 

The TTL TLV carried in an LLDPDU determines how long the device information

 

carried in the LLDPDU can be saved on a recipient device. You can configure the

 

TTL of locally sent LLDPDUs to determine how long information about the local

 

device can be saved on a neighbor device by setting the TTL multiplier. The TTL is

TTL Multiplier

expressed as TTL multiplier × LLDPDU transit interval.

IMPORTANT:

 

 

∙ If the product of the TTL multiplier and the LLDPDU transmit interval is greater

 

than 65535, the TTL carried in transmitted LLDPDUs takes 65535 seconds.

 

∙ As the maximum TTL allowed by CDP is 255 seconds, you must ensure that the

 

product of the TTL multiplier and the LLDPDU transmit interval is less than 255

 

seconds for CDP-compatible LLDP to work properly with Cisco IP phones.

 

 

 

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