HP V1910 User Manual page 242

The Global Setup tab
a.
Global LLDP setup configuration items
2.
Item
LLDP Enable
CDP Compatibility
Fast LLDPDU Count
TTL Multiplier
Description
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
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.
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
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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