HPE FlexNetwork HSR6800 series Configuration Manual page 43

Packet type Processing procedure
Checks whether the
Flush packet local DLDP port
state is Disable.
Retrieves the
Probe neighbor
information.
Retrieves the
Echo neighbor
information.
Checks whether the
local DLDP port
Disable
state is Disable.
Checks whether the
local port is in
RecoverProbe Disable or
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state.
Checks whether the
RecoverEcho local DLDP port
state is Disable.
Checks whether the
LinkDown packet local port operates
in Enhanced mode.
3. If no echo packet is received from a neighbor, DLDP takes action as described in
If a matching neighbor entry already exists, resets the Entry
timer.
If yes, performs no processing.
If no, removes the matching neighbor entry (if any).
If no matching neighbor entry exists, creates the neighbor
entry, transits to the Probe state, and returns Echo packets.
If a matching neighbor entry already exists, resets the Entry
timer and returns Echo packets.
If no matching neighbor entry exists, creates the neighbor
entry, triggers the Entry timer, and changes the DLDP port
state to Probe.
If a matching neighbor entry already exists:
•
Drops the packet if it carries information that conflicts
with the neighbor entry.
•
Otherwise, sets the state of the neighbor to two way
(bidirectional). If all the neighbors are in two way state,
changes from the Probe state to the Advertisement state
and disable the Echo timer.
If yes, no process is performed.
If no, sets the state of the neighbor to one way
(unidirectional), and then checks the state of other neighbors
to determine the subsequent action to take:
•
If all the neighbors are in one way state, changes the
local DLDP port state to Disable.
•
If the state of some neighbors is still unknown, takes no
action until the state of these neighbors is determined.
•
If any two-way neighbor is present, removes all one-way
neighbors, but does not change the DLDP port state.
If yes, returns RecoverEcho packets.
If no, no process is performed.
If yes, changes the local DLDP port state to Active if the
neighbor information the packet carries is consistent with the
local port information.
If no, no process is performed.
If yes and the local port is not in Disable state, sets the state of
the neighbor to one way, and then checks the state of other
neighbors to determine the subsequent action to take:
•
If all the neighbors are in one way state, changes the
local DLDP port state to Disable.
•
If the state of some neighbors is still unknown, takes no
action until the state of these neighbors is determined.
•
If any two-way neighbor is present, removes all one-way
neighbors, but does not change the DLDP port state.
If no, no process is performed.
36
Table 16.