3Com 4210G Series - Configuring Dldp Authentication; Resetting Dldp State

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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.
z 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… Use the command… Remarks
Enter system view system-view —
Set port shutdown mode
dldp unidirectional-shutdown
{ auto | manual }
Optional
auto by default
z 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.
z 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… 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
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
user-defined port shutdown mode. To enable the port to perform DLDP detect again, you can reset the
DLDP state of the port in one of the following methods: