HP A5120 EI Configuration Manual page 42

DLDP timers
Table 11 DLDP timers
DLDP timer
Active timer
Advertisement timer
Probe timer
Echo timer
Entry timer
Enhanced timer
DelayDown timer
RecoverProbe timer
Description
Determines the interval for sending Advertisement packets with RSY tags, which
defaults to 1 second. By default, a switch in the active DLDP link state sends one
Advertisement packet with RSY tags every second. The maximum number of
advertisement packets with RSY tags that can be sent successively is 5.
Determines the interval for sending common advertisement packets, which
defaults to 5 seconds.
Determines the interval for sending Probe packets, which defaults to 1 second. By
default, a switch in the probe state sends two Probe packets 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 switch 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 switch transits to the Disable state. In this case, the
switch 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 switch 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 switch sends up to eight probe packets
to the neighbor at a frequency of one packet per second.
A switch 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 switch transits to this state, the DelayDown timer is triggered. A switch in
DelayDown state only responds to port-up events.
If the switch 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 switch 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.
37