HP 6125G Configuration Manual page 40

Table 15 Procedures for processing different types of DLDP packets received
Packet type
Advertisement
packet with RSY tag
Normal
Advertisement
packet
Flush packet
Probe packet
Echo packet
Disable packet
RecoverProbe
packet
RecoverEcho packet
Processing procedure
If the corresponding neighbor entry does not exist, creates the
neighbor entry, triggers the Entry timer, and transits to Probe
Retrieves the
state.
neighbor
information
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
Retrieves the
state.
neighbor
information
If the corresponding neighbor entry already exists, resets the
Entry timer.
Determines whether If yes, performs no processing.
or not the local port
If no, removes the corresponding neighbor entry (if any).
is in Disable state
If the corresponding neighbor entry does not exist, creates the
Retrieves the
neighbor entry, transits to Probe state, and returns Echo packets.
neighbor
If the corresponding neighbor entry already exists, resets the
information
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.
Retrieves the
The
neighbor
correspondin
information
g neighbor
entry already
exists
If yes, performs no processing.
If not, sets the state of the corresponding neighbor to
unidirectional, and then checks the state of other neighbors. If
Checks whether the
all the neighbors are unidirectional, transitions the local port to
local port is in
the Disable state. If the state of some neighbors is unknown,
Disable state
waits until the state of these neighbors is determined. If
bidirectional neighbors are present, removes all unidirectional
neighbors.
Checks whether the
If not, performs no processing.
local port is in
Disable or
If yes, returns RecoverEcho packets.
Advertisement state
If not, performs no processing.
Checks whether the
If yes, the local port transits to Active state if the neighbor
local port is in
information the packet carries is consistent with the local port
Disable state
information.
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
device transits from Probe state to
Advertisement state and disables the Echo
timer.
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