3Com WX3000 Dldp timers, Dldp works with the following timers 2DLDP timers, Timer Description

Status		Description
		DHCP sends packets to check if it is a unidirectional link. It enables
Probe		the probe sending timer and an echo waiting timer for each target
		neighbor.
		DLDP detects a unidirectional link, or finds (in enhanced mode) that
Disable		a neighbor disappears. In this case, DLDP does not receive or send
		DLDP packets.
		When a device in the active, advertisement, or probe DLDP state
		receives a port down message, it does not removes the
Delaydown		corresponding neighbor immediately, neither does it changes to the
		inactive state. Instead, it changes to the delaydown state first.
	When a device changes to the delaydown state, the related DLDP
	neighbor information remains, and the Delaydown timer is triggered.

DLDP timers

DLDP works with the following timers:

Table 1-2DLDP timers

Timer	Description
	Interval of sending advertisement packets, which can be
Advertisement sending timer	configured with a command line.
	By default, the interval is 5 seconds.
Probe sending timer	The interval is 0.5 second. In probe status, DLDP sends two probe
	packets every second.
	It is enabled when DLDP enters probe status. The timeout time is
	10 seconds.
	If no echo packet is received from the neighbor when the Echo
	waiting timer expires, the local end is set to unidirectional
Echo waiting timer	communication status and the state machine turns into disable
	status. DLDP outputs log and tracking information, sends flush
	packets. Depending on the user-defined DLDP down mode,
	DLDP disables the local port automatically or prompt the user to
	disable the port manually. At the same time, DLDP deletes the
	neighbor entry.
	When a new neighbor joins, a neighbor entry is created, and the
	corresponding entry aging timer is enabled.
	When an advertisement packet is received from a neighbor, the
	neighbor entry is updated, and the corresponding entry aging
	timer is updated.
Entry aging timer	In normal mode, if no packet is received from the neighbor when
	the entry aging timer expires, DLDP sends an advertisement
	packet with RSY tag, and deletes the neighbor entry.
	In enhanced mode, if no packet is received from the neighbor
	when the entry aging timer expires, DLDP enables the enhanced
	timer.
	The interval set for the entry aging timer is three times of that for
	the advertisement timer.

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