Configuring Dldp Authentication; Resetting Dldp State - H3C S5120-EI Series Operation Manual

Manual mode. This mode applies to networks with low performance, where normal links may be
treated as unidirectional links. It protects service packet transmission against false unidirectional
links. In this mode, DLDP only detects unidirectional links and generates log and traps. The
operations to shut down unidirectional link ports are accomplished by the administrator.
Auto mode. In this mode, when a unidirectional link is detected, DLDP transits to Disable state,
generates log and traps, and set the port as DLDP Down.
Follow these steps to set port shutdown mode:
To do...
Enter system view
Set port shutdown mode
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, causing remote
OAM loopback to operate improperly. To prevent this, you need to set the port shutdown mode to
auto mode.
If the device is busy, or the CPU utilization is high, normal links may be treated as unidirectional
links. In this case, you can set the port shutdown mode to manual mode to eliminate the effects
caused by false unidirectional link report.

Configuring DLDP Authentication

Follow these steps to configure DLDP authentication:
To do...
Enter system view
Configure DLDP
authentication
To enable DLDP to operate properly, make sure the DLDP authentication modes and the passwords of
the 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 shuts down the port automatically depending on the
Use the command...
system-view
dldp unidirectional-shutdown
{ auto | manual }
Use the command...
system-view
dldp authentication-mode { md5
md5-password | none | simple
simple-password }
1-11
Remarks
—
Optional
auto by default
Remarks
—
Required
none by default