H3C Technologies H3C S10500 Series Switches - Manual (Page 50)

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To do… Use the command… Remarks
Set port shutdown mode
dldp unidirectional-shutdown { auto |
manual } Optional
auto by default
NOTE:
If the device is busy, or the CPU usage is high, normal links may 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.
Configuring DLDP authentication
You can guard your network against attacks and malicious probes by configuring an appropriate DLDP
authentication mode, which can be clear text authentication or MD5 authentication. If your network is
safe, you can choose not to authenticate.
Follow these steps to configure DLDP authentication:
To do… Use the command… Remarks
Enter system view system-view —
Configure DLDP authentication
dldp authentication-mode { md5
md5-password | none | simple
simple-password }
Required
none by default
NOTE:
To enable DLDP to operate properly, make sure that DLDP authentication modes and passwords on both
sides of a link are the same.
Resetting DLDP state
After DLDP detects a unidirectional link on a port, the port enters Disable state. In this case, DLDP prompts
you to shut down the port manually or it shuts down the port automatically depending on the user-defined
port shutdown mode. To enable the port to perform DLDP detect again, you can reset the DLDP state of
the port by using one of the following methods:
• If the port is shut down with the shutdown command manually, run the undo shutdown command
on the port.
• If DLDP automatically shuts down the port, run the dldp reset command on the port to enable the
port to perform DLDP detection again. Alternatively, you can wait for DLDP to automatically enable
the port when it detects that the link has been restored to bidirectional. For how to reset the DLDP
state by using the dldp reset command, see “ Resetting DLDP state in system view ” and “ Resetting
DLDP state in interface view/port group view .”
The DLDP state that the port transits to upon the DLDP state reset operation depends on its physical state.
If the port is physically down, it transits to Inactive state; if the port is physically up, it transits to Active
state.
Resetting DLDP state in system view
Resetting DLDP state in system view applies to all ports of the device.