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Basic concepts
DLDP neighbor states
If port A and B are on the same link and port A can receive link-layer packets from port B, port B is a
DLDP neighbor of port A. Two ports that can exchange packets are neighbors.
Table 6 DLDP neighbor states
DLDP timer Description
Confirmed The link to a DLDP neighbor is bidirectional.
Unconfirmed The state of the link to a newly discovered neighbor is not determined.
DLDP port states
A DLDP-enabled port is called a DLDP port. A DLDP port can have multiple neighbors, and its state
depends on the DLDP neighbor state.
Table 7 DLDP port states
State Description
Initial DLDP is enabled on the port, but is disabled globally.
Inactive DLDP is enabled on the port and globally, and the link is physically down.
Bidirectional
DLDP is enabled on the port and globally, and at least one neighbor in
Confirmed state exists.
Unidirectional
DLDP is enabled on the port and globally, and no neighbor in Confirmed state
exists. In this state, a port does not send or receive packets other than DLDP
packets any more.
DLDP timers
Table 8 DLDP timers
DLDP timer Description
Advertisement timer
Advertisement packet sending interval (the default is 5 seconds and is
configurable).
Probe timer Probe packet sending interval. This timer is set to 1 second.
Echo timer
The Echo timer is triggered when a probe is launched for a new neighbor. This
timer is set to 10 seconds.
Entry timer
When a new neighbor joins, a neighbor entry is created and the corresponding
entry timer is triggered if the neighbor is in Confirmed state. When an
Advertisement is received, the device updates the corresponding neighbor entry
and the Entry timer.
The setting of an Entry timer is three times that of the Advertisement timer.
Enhanced timer
The Enhanced timer is triggered, together with the Echo timer, when the Entry
timer expires. Enhanced timer is set to 1 second.
DelayDown timer
If a port is physically down, the device triggers the DelayDown timer (the default
is 1 second and is configurable), rather than removing the corresponding
neighbor entry.
When the DelayDown timer expires, the device removes the corresponding
DLDP neighbor information if the port is down, and does not perform any
operation if the port is up.
RecoverProbe timer
This timer is set to 2 seconds. A port in the Unidirectional state regularly sends
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