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CAUTION:
The maximum TTL value that CDP allows is 255 seconds. To make CDP-compatible LLDP work properly
ith Cisco IP phones, be sure that the product of the TTL multiplier and the LLDPDU transmit interval is less
than 255 seconds.
CDP-compatible LLDP operates in one of the follows modes:
• TxRx—CDP packets can be transmitted and received.
• Disable—CDP packets cannot be transmitted or received.
To make CDP-compatible LLDP take effect on specific ports, first enable CDP-compatible LLDP globally,
and then configure CDP-compatible LLDP to operate in TxRx mode.
To enable LLDP to be compatible with CDP:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enable CDP compatibility
globally.
lldp compliance cdp Disabled by default.
3. Enter Ethernet interface view
or port group view.
• Enter Layer 2 Ethernet interface view:
interface interface-type
interface-number
• Enter port group view:
port-group manual port-group-name
Use either command.
4. Configure CDP-compatible
LLDP to operate in TxRx
mode.
lldp compliance admin-status cdp txrx Disable mode by default.
Configuring LLDP trapping
LLDP trapping notifies the network management system (NMS) of events such as newly-detected
neighboring devices and link malfunctions.
LLDP traps are sent periodically, and the interval is configurable. To prevent excessive LLDP traps from
being sent when the topology is unstable, set a trap transmit interval for LLDP.
To configure LLDP trapping:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter Ethernet interface view or port
group view.
• Enter Layer 2 Ethernet interface view:
interface interface-type
interface-number
• Enter port group view:
port-group manual port-group-name
Use either command.
3. Enable LLDP trapping.
lldp notification remote-change enable Disabled by default.
4. Return to system view.
quit N/A
5. Set the LLDP trap transmit interval.
lldp timer notification-interval interval
Optional.
5 seconds by default.
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