Setting The Delaydown Timer; Setting The Port Shutdown Mode - HPE FlexNetwork HSR6800 series Configuration Manual

To enable DLDP to operate correctly, make sure the two sides of the link use the same
Advertisement packet sending interval.
To set the Advertisement packet sending interval:
Step
1. Enter system view.
2. Set the interval to send
Advertisement
packets.

Setting the DelayDown timer

The DelayDown timer setting applies to all DLDP-enabled ports.
On some ports, when the Tx line fails, the port goes down and then comes up again, causing optical
signal jitters on the Rx line. To avoid this problem, when a port goes down due to a Tx failure, the
device transits to the DelayDown state instead of the Inactive state. This prevents the corresponding
neighbor entries from being removed. At the same time, the device triggers the DelayDown timer. If
the port goes up before the timer expires, the device restores the original state. If the port remains
down when the timer expires, the device transits to the Inactive state.
To set the DelayDown timer
Step
1. Enter system view.
2. Set the DelayDown
timer.

Setting the port shutdown mode

On detecting a unidirectional link, the ports can be shut down in one of the following two modes.
•
Manual mode—This mode applies to low performance networks, where normal links might be
treated as unidirectional links. It protects data traffic transmission against false unidirectional
links. In this mode, DLDP only detects unidirectional links but does not automatically shut down
unidirectional link ports. Instead, the DLDP state machine generates log and traps to prompt
you to manually shut down unidirectional link ports with the shutdown command. Hewlett
Packard Enterprise recommends that you do as prompted. Then the DLDP state machine
transits to the Disable state.
•
Auto mode—In this mode, when a unidirectional link is detected, DLDP transits to Disable
state, generates log and traps, and sets the port state to DLDP Down.
On a port with both remote OAM loopback and DLDP enabled, if the port shutdown mode is auto
mode, the port will be shut down by DLDP when it receives a packet sent by itself. This will cause
remote OAM loopback to operate incorrectly. To prevent this, set the port shutdown mode to manual
mode.
If the device is busy, or the CPU usage is high, normal links might be treated as unidirectional links.
In this case, you can set the port shutdown mode to manual mode to alleviate the impact caused by
false unidirectional link report.
To set port shutdown mode:
Command
system-view
dldp interval time
Command
system-view
dldp delaydown-timer time
40
Remarks
N/A
Optional.
5 seconds by default.
Remarks
N/A
Optional.
1 second by default.