3Com 4500G Family Configuration Manual page 851

Table 1-4 DLDP packet types and DLDP states
DLDP state
Active
Advertisement
Probe
Disable
When a device transits from a DLDP state other than Inactive state or Disable state to Initial state, it
sends Flush packets.
2) A received DLDP packet is processed as follows.
In any of the three authentication modes, the packet is dropped if it fails to pass the authentication.
The packet is dropped if the setting of the interval for sending Advertisement packets it carries
conflicts with the corresponding local setting.
Other processes.
Table 1-5 Procedures for processing different types of DLDP packets
Packet type
Advertisement Retrieving the
packet with RSY neighbor
tag information.
Normal
Retrieves the
Advertisement
neighbor
information.
packet
Determines
whether or not the
Flush packet
local port is in
Disable state.
Retrieves the
Probe packet neighbor
information.
Type of DLDP packets sent
Advertisement packet with RSY tag
Normal Advertisement packet
Probe packet
Disable packet and RecoverProbe packet
Processing procedure
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 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.
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