3Com WX3000 operation manual 4Types of packets sent by Dldp, Dldp status Packet types

Table 1-4Types of packets sent by DLDP

DLDP status	Packet types
Active	Advertisement packets, including those with or without RSY tags
Advertisement	Advertisement packets
Probe	Probe packets

2)DLDP analyzes and processes received packets as follows:

zIn authentication mode, DLDP authenticates the packets, and discards those do not pass the authentication.

zDLDP processes the received DLDP packets.

Table 1-5Process received DLDP packets

Packet type			Processing procedure
			If this neighbor entry does not exist on the local device,
Advertisement	Extract neighbor		DLDP creates the neighbor entry, enables the entry
			aging timer, and turns to probe status.
packet	information
			If the neighbor entry already exists on the local device,
			DLDP refreshes the entry aging timer.
Flush packet	Delete the neighbor entry from the local device
	Send echo packets		Create the neighbor entry if this neighbor entry does not
Probe packet	containing both		exist on the local device.
	neighbor and its own
			If the neighbor entry already exists on the local device,
	information to the
	peer		refresh the entry aging timer.
		No	Discard this echo packet
				No	Discard this echo packet
	Check		Check
					Set the neighbor flag bit to
			whether
	whether the				bidirectional
Echo packet			neighbor
	local device
		Yes	information in		If all neighbors are in
	is in probe
			the packet is
	status			Yes	bidirectional communication
			the same as
					state, DLDP turns from probe
			that on the
					status to advertisement status,
			local device
					and sets the echo waiting timer
					to 0.

3)If no echo packet is received from the neighbor, DLDP performs the following processing:

Table 1-6Processing when no echo packet is received from the neighbor

No Echo packet received from the		Processing procedure
neighbor
In normal mode, no echo packet is received	DLDP turns into disable status. It outputs log and
when the echo waiting timer expires	tracking information, sends flush packets. Depending
	on the user-defined DLDP down mode, DLDP
In enhanced mode, no echo packet is	disables the local port automatically or prompt the
	user to disable the port manually. DLDP sends the
received when the enhanced timer expires
	RSY message and deletes the neighbor entry.

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