HP A5120 EI - Page 45

40
Packet type
Processing procedure
If the corresponding neighbor entry already exists, resets the
Entry timer and transits to Probe state.
Normal
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packet
Retrieves the
neighbor information
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.
Flush packet
Determines whether
or not the local port
is in Disable state
If yes, no process is performed.
If not, removes the corresponding neighbor entry (if any).
Probe packet
Retrieves the
neighbor information
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.
Echo packet
Retrieves the
neighbor information
If the corresponding neighbor entry does not exist, creates the
neighbor entry, triggers the Entry timer, and transits to Probe
state.
The
correspondin
g neighbor
entry already
exists
If the neighbor information it carries conflicts
with the corresponding locally maintained
neighbor entry, drops the packet.
Otherwise, sets the flag of the neighbor as
two-way connected. In addition, if the flags
of all the neighbors are two-way connected,
the switch transits from Probe state to
Advertisement state and disables the Echo
timer.
Disable packet
Checks whether the
local port is in
Disable state
If yes, no process is performed.
If not, the local port transits to Disable state.
RecoverProbe
packet
Checks whether the
local port is in
Disable or
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If not, no process is performed.
If yes, returns RecoverEcho packets.
RecoverEcho
packet
Checks whether the
local port is in
Disable state
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.
LinkDown packet
Checks whether the
local port operates in
Enhanced mode
If not, no process is performed.
If yes and the local port is not in Disable state, the local port
transits to Disable state.
3. If no echo packet is received from the neighbor, DLDP performs the following processing.