H3C S5120-EI Series - Configuring DLDP Authentication; Resetting DLDP State

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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.
To set port shutdown mode:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Set port shutdown mode.
dldp unidirectional-shutdown
{ auto | manual }
Optional.
auto by default.
Configuring DLDP authentication
You can guard your network against attacks and malicious probes by configuring an appropriate DLDP
authentication mode, which can be simple authentication or MD5 authentication. If your network is safe,
you can choose not to authenticate.
To enable DLDP to operate properly, make sure that DLDP authentication modes and passwords on both
sides of a link are the same.
To configure DLDP authentication:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Configure DLDP
authentication.
dldp authentication-mode { none |
{ md5 | simple } password }
none by default.
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
D
LDP 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.
To reset DLDP in system view: