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Step Command Remarks
2. Enable DLDP globally.
dldp global enable
By default, DLDP is globally
disabled.
3. Enter Layer 2 Ethernet
interface view.
interface
interface-type
interface-number
N/A
4. Enable DLDP.
dldp enable
By default, DLDP is disabled on
an interface.
Setting the interval to send advertisement packets
To make sure DLDP can detect unidirectional links before network performance deteriorates, set the
advertisement interval appropriate for your network environment. As a best practice, use the default
interval.
To set the Advertisement packet sending interval:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Set the interval to send
Advertisement packets.
dldp interval
time
The default is 5 seconds.
Setting the DelayDown timer
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 triggers the DelayDown timer to prevent the corresponding neighbor entries from being
removed. If the port remains down when the timer expires, the device removes the DLDP neighbor
information. If the port goes up, the device takes no action.
To set the DelayDown timer:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Set the DelayDown timer.
dldp delaydown-timer
time
The default is 1 second.
The DelayDown timer setting
applies to all DLDP-enabled ports.
Setting the port shutdown mode
On detecting a unidirectional link, the ports can be shut down in one of the following modes:
• Auto mode—When a unidirectional link is detected, DLDP changes the DLDP port state to
Unidirectional. The unidirectional port periodically sends RecoverProbe packets. When a
correct RecoverEcho packet is received, the link is restored to a bidirectional link, and the port
state changes from Unidirectional to Bidirectional. This process is called link auto-recovery
mechanism.
• Manual mode—When a unidirectional link is detected, DLDP does not shut down the port, and
you need to manually shut it down. When the link state is restored to Bidirectional, you must
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