Operation Manual – DLDPH3C S5600 Series Ethernet Switches Chapter 1 DLDP Configuration1-71.2.3 DLDP TimersTable 1-6 DLDP timersTimer DescriptionAdvertisement sendingtimerInterval between sending advertisement packets, whichcan be configured on a command line interface.By default, the timer length is 5 seconds.Probe sending timer The interval is 0.5 seconds. In the probe state, DLDPsends two probe packets in a second.Echo waiting timerIt is enabled when DLDP enters the probe state. Theecho waiting timer length is 10 seconds.If no echo packet is received from the neighbor whenthe Echo waiting timer expires, the state of the local endis set to unidirectional link (one-way audio) and the statemachine turns into the disable state. DLDP outputs logand tracking information, sends flush packets.Depending on the user-defined DLDP down mode,DLDP disables the local port automatically or promptsyou to disable the port manually. At the same time,DLDP deletes the neighbor entry.Entry aging timerWhen a new neighbor joins, a neighbor entry is createdand the corresponding entry aging timer is enabledWhen an advertisement packet is received from aneighbor, the neighbor entry is updated and thecorresponding entry aging timer is updatedIn the normal mode, if no packet is received from theneighbor when the entry aging timer expires, DLDPsends an advertisement packet with an RSY tag, anddeletes the neighbor entry.In the enhanced mode, if no packet is received from theneighbor when the entry aging timer expires, DLDPenables the enhanced timerThe entry aging timer length is three times theadvertisement timer length.Enhanced timerIn the enhanced mode, if no packet is received from theneighbor when the entry aging timer expires, DLDPenables the enhanced timer for the neighbor. Theenhanced timer length is 10 secondsThe enhanced timer then sends one probe packet everysecond and eight packets successively to the neighbor.If no echo packet is received from the neighbor whenthe enhanced timer expires, the state of the local end isset to unidirectional communication state and the statemachine turns into the disable state. DLDP outputs logand tracking information and sends flush packets.Depending on the user-defined DLDP down mode,DLDP disables the local port automatically or promptsyou to disable the port manually. Meanwhile, DLDPdeletes the neighbor entry.
