4-8Table 4-7 Description on DLDP neighbor statesDLDP neighbor state DescriptionUnknownA neighbor is in this state when it is just detected and is being probed.No information indicating the state of the neighbor is received. Aneighbor is in this state only when it is being probed. It transits to Twoway state or Unidirectional state after the probe operation finishes.Two way A neighbor is in this state after it receives response from its peer. Thisstate indicates the link is a two-way link.UnidirectionalA neighbor is in this state when the link connecting it is detected to be aunidirectional link. After a device transits to this state, the correspondingneighbor entries maintained on other devices are removed.DLDP Configuration Task ListComplete the following tasks to configure DLDP:Task RemarksEnabling DLDP RequiredSetting DLDP Mode OptionalSetting the Interval for Sending Advertisement Packets OptionalSetting the DelayDown Timer OptionalSetting the Port Shutdown Mode OptionalConfiguring DLDP Authentication OptionalResetting DLDP State OptionalNote that:z DLDP takes effects only on Ethernet interfaces.z DLDP can detect unidirectional links only after all links are connected. Therefore, before enablingDLDP, make sure that optical fibers or copper twisted pairs are connected.z To ensure unidirectional links can be detected, make sure these settings are the same on the bothsides: DLDP state (enabled/disabled), the interval for sending Advertisement packets,authentication mode, and password.z Keep the interval for sending Advertisement packets adequate to enable unidirectional links to bedetected in time. If the interval is too long, unidirectional links cannot be terminated in time; if theinterval is too short, network traffic may increase in vain.z DLDP does not process any link aggregation control protocol (LACP) events. The links in anaggregation group are treated individually in DLDP.z When connecting two DLDP-enabled devices, make sure the DLDP software version ID fields ofthe DLDP packets exchanged between the two devices are the same. Otherwise, DLDP mayoperate improperly.Enabling DLDPTo properly configure DLDP on the device, you need to first enable DLDP globally, and then enable iton each port.
