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Figure 184 The global setup tab
3. Set the global LLDP setup as described in Table 73 .
4. Click Apply .
A progress dialog box appears.
5. Click Close on the progress dialog box when the progress dialog box prompts that the
configuration succeeds.
Table 73 Configuration items
Item Description
LLDP Enable Select from the list to enable or disable global LLDP.
CDP Compatibility
Select from the list to enable or disable CDP compatibility of LLDP.
When you configure CDP compatibility, follow these guidelines:
•
To enable LLDP to be compatible with CDP on a port, you must set the CDP
operating mode on the port to TxRx and enable CDP compatibility on the
Global Setup tab.
•
Because the maximum TTL allowed by CDP is 255 seconds, you must make sure
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.
TTL Multiplier
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 .
When you configure the TTL multiplier, follow these guidelines:
•
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.
•
Because the maximum TTL allowed by CDP is 255 seconds, you must make sure
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.