Configuring Dldp - HPE FlexNetwork HSR6800 series Configuration Manual

The auto-negotiation mechanism and DLDP work together to make sure that physical/logical
unidirectional links are detected and shut down, and to prevent failure of other protocols such as STP.
If both ends of a link are operating correctly at the physical layer, DLDP detects whether the link is
correctly connected at the link layer and whether the two ends can exchange packets correctly. This
is beyond the capability of the auto-negotiation mechanism at the physical layer.

Configuring DLDP

DLDP link states
A device is in one of the following DLDP link states: Initial, Inactive, Active, Advertisement, Probe,
Disable, and DelayDown, as described in
Table 10 DLDP link states
State
Initial
Inactive
Active
Advertisement
Probe
Disable
DelayDown
DLDP timers
Table 11 DLDP timers
DLDP timer
Active timer
Advertisement timer
Probe timer
Table 10.
Indicates...
DLDP is disabled.
DLDP is enabled, and the link is down.
DLDP is enabled and the link is up, or the neighbor entries have been cleared.
All neighbors are bi-directionally reachable or DLDP has been in active state for
more than 5 seconds. This is a relatively stable state where no unidirectional
link has been detected.
DLDP enters this state if it receives a packet from an unknown neighbor. In this
state, DLDP sends packets to check whether the link is unidirectional. When
DLDP transits to this state, a probe timer starts and an echo timeout timer starts
for each neighbor to be probed.
A port enters this state when:
•
A unidirectional link is detected.
•
The contact with the neighbor in enhanced mode gets lost.
•
In this state, the port does not receive or send packets other than
DLDPDUs.
A port in the Active, Advertisement, or Probe DLDP link state transits to this
state rather than removing the corresponding neighbor entry and transits to the
Inactive state when it detects a port-down event. When a port transits to this
state, the DelayDown timer is triggered.
Description
Determines the interval for sending Advertisement packets with RSY tags
(default is to 1 second). By default, a device 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 (default is
5 seconds).
Determines the interval for sending Probe packets (default is 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.
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