HP A5830 series Configuration Manual page 37

DLDP timer
Probe timer
Echo timer
Entry timer
Enhanced timer
DelayDown timer
RecoverProbe timer
DLDP mode
DLDP can operate in normal or enhanced mode.
In normal DLDP mode, when an entry timer expires, the device removes the corresponding
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neighbor entry and sends an Advertisement packet with the RSY tag.
In enhanced DLDP mode, when an entry timer expires, the Enhanced timer is triggered and the
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device tests the neighbor by sending up to eight Probe packets at the frequency of one packet per
second. If no Echo packet has been received from the neighbor when the Echo timer expires, the
device transits to the Disable state.
Description
Determines the interval for sending Probe packets, which defaults to 1 second.
By default, a device in the probe state sends one Probe packet every second.
The maximum number of Probe packets that can be sent successively is 10.
This timer is set to 10 seconds. It is triggered when a device transits to the Probe
state or when an enhanced detect is launched. When the Echo timer expires
and no Echo packet has been received from a neighbor device, the state of the
link is set to unidirectional and the device transits to the Disable state. In this
case, the device does the following:
Sends Disable packets.
Either prompts the user to shut down the port or shuts down the port
automatically (depending on the DLDP down mode configured).
Removes the corresponding neighbor entries.
When a new neighbor joins, a neighbor entry is created and the corresponding
entry timer is triggered. When a DLDP packet is received, the device updates
the corresponding neighbor entry and the entry timer.
In normal mode, if no packet is received from a neighbor when the
corresponding entry timer expires, DLDP sends advertisement packets with RSY
tags and removes the neighbor entry.
In enhanced mode, if no packet is received from a neighbor when the Entry
timer expires, DLDP triggers the enhanced timer.
The setting of an Entry timer is three times that of the Advertisement timer.
In enhanced mode, this timer is triggered if no packet is received from a
neighbor when the entry timer expires. Enhanced timer is set to 1 second.
After the Enhanced timer is triggered, the device sends up to eight probe
packets to the neighbor at a frequency of one packet per second.
A device in Active, Advertisement, or Probe DLDP link state transits to
DelayDown state rather than removes the corresponding neighbor entry and
transits to the Inactive state when it detects a port-down event.
When a device transits to this state, the DelayDown timer is triggered. A device
in DelayDown state only responds to port-up events.
If a device in the DelayDown state detects a port-up event before the
DelayDown timer expires, it resumes its original DLDP state. If not, when the
DelayDown timer expires, the device removes the corresponding DLDP neighbor
information and transits to the Inactive state.
This timer is set to 2 seconds. A port in the Disable state sends one
RecoverProbe packet every two seconds to detect whether a unidirectional link
has restored.
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