D-Link DGS-3700 Series Reference Manual page 547

DGS-3700 Series Layer 2 Managed Gigabit Ethernet Switch CLI Reference Guide
show duld ports
Parameters
Restrictions
Example usage:
To show ports 1-4 unidirectional link detection information:
DES-3528:5# show duld ports 1-4
Commands: show duld ports 1-4
port Admin State
Time(Sec)
---- -----------
1 Enabled
2 Enabled
3 Enabled
4 Disabled
DES-3528:5#
remote peer supporting this detection capability.
(2) Disabled: either local or remote do not support OAM or unidirectional
detection.
So we should enable OAM when we need to detect the unidirectional link.
portlist – Specifies a range of ports to be configured. Use all to specify all ports.
None.
Oper Status
----------- ----------
Enabled
Enabled
Enabled
Disabled
Mode Link Status
--------------
Shutdown Bidirectional
Normal RX Fault
Normal TX Fault
Normal Unknown
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Discovery
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5
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