1-12Configuring CDP CompatibilityCDP-compatible LLDP operates in one of the follows two modes:z TxRx, where CDP packets can be transmitted and received.z Disable, where CDP packets can neither be transmitted nor be received.To make CDP-compatible LLDP take effect on certain ports, first enable CDP-compatible LLDP globallyand configure CDP-compatible LLDP to operate in TxRx mode.Follow these steps to enable LLDP to be compatible with CDP:To do… Use the command… RemarksEnter system view system-view —Enable CDP compatibilityglobally lldp compliance cdp RequiredDisabled by default.EnterEthernetinterface viewinterface interface-typeinterface-numberEnter Ethernetinterface viewor port groupview Enter portgroup viewport-group manualport-group-nameRequiredUse either command.Configure CDP-compatibleLLDP to operate in TxRx modelldp complianceadmin-status cdp txrxRequiredBy default, CDP-compatible LLDPoperates in disable mode.As the maximum TTL allowed by CDP is 255 seconds, ensure that the product of the TTL multiplier andthe LLDPDU transmit interval is less than 255 seconds for CDP-compatible LLDP to work properly withCisco IP phones.Configuring LLDP TrappingLLDP trapping is used to notify the network management system (NMS) of events such as newneighboring devices detected and link malfunctions.To prevent excessive LLDP traps from being sent when topology is unstable, you can set a minimumtrap sending interval for LLDP.Follow these steps to configure LLDP trap:To do… Use the command… RemarksEnter system view system-view —Enter Ethernetinterface viewinterface interface-typeinterface-numberEnter Ethernetinterface viewor port groupview Enter port groupviewport-group manualport-group-nameRequiredUse either command.Enable LLDP trap sending lldp notification remote-changeenableRequiredDisabled by default
