HP A5120 EI Configuration Manual page 45

Packet type Processing procedure
Normal
Retrieves the
Advertisement
neighbor information
packet
Determines whether
Flush packet or not the local port
is in Disable state
Retrieves the
Probe packet
neighbor information
Retrieves the
Echo packet
neighbor information
Checks whether the
Disable packet local port is in
Disable state
Checks whether the
RecoverProbe local port is in
packet Disable or
Advertisement state
Checks whether the
RecoverEcho
local port is in
packet
Disable state
Checks whether the
LinkDown packet
local port operates in
Enhanced mode
If no echo packet is received from the neighbor, DLDP performs the following processing.
3.
If the corresponding neighbor entry already exists, resets the
Entry timer and transits to Probe state.
If the corresponding neighbor entry does not exist, creates the
neighbor entry, triggers the Entry timer, and transits to Probe
state.
If the corresponding neighbor entry already exists, resets the
Entry timer.
If yes, no process is performed.
If not, removes the corresponding neighbor entry (if any).
If the corresponding neighbor entry does not exist, creates the
neighbor entry, transits to Probe state, and returns Echo
packets.
If the corresponding neighbor entry already exists, resets the
Entry timer and returns Echo packets.
If the corresponding neighbor entry does not exist, creates the
neighbor entry, triggers the Entry timer, and transits to Probe
state.
If the neighbor information it carries conflicts
with the corresponding locally maintained
neighbor entry, drops the packet.
The
correspondin
Otherwise, sets the flag of the neighbor as
g neighbor
two-way connected. In addition, if the flags
entry already
of all the neighbors are two-way connected,
exists
the switch transits from Probe state to
Advertisement state and disables the Echo
timer.
If yes, no process is performed.
If not, the local port transits to Disable state.
If not, no process is performed.
If yes, returns RecoverEcho packets.
If not, no process is performed.
If yes, the local port transits to Active state if the neighbor
information the packet carries is consistent with the local port
information.
If not, no process is performed.
If yes and the local port is not in Disable state, the local port
transits to Disable state.
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