Setting The Port Shutdown Mode; Configuring Dldp Authentication - HP A5120 EI Configuration Manual

Follow these steps to set the DelayDown timer
To do...
Enter system view
Set the DelayDown timer
NOTE:
DelayDown timer setting applies to all DLDP-enabled ports.

Setting the port shutdown mode

On detecting a unidirectional link, the ports can be shut down in one of the following two modes.
 Manual mode. This mode applies to low performance networks, where normal links may be treated
as unidirectional links. It protects data traffic transmission against false unidirectional links. In this
mode, DLDP only detects unidirectional links but does not automatically shut down unidirectional link
ports. Instead, the DLDP state machine generates log and traps to prompt you to manually shut
down unidirectional link ports with the shutdown command. HP recommends that you do as
prompted. Then the DLDP state machine transits to the Disable state.
Auto mode. In this mode, when a unidirectional link is detected, DLDP transits to Disable state,

generates log and traps, and sets the port state to DLDP Down.
Follow these steps to set port shutdown mode:
To do...
Enter system view
Set port shutdown mode
NOTE:

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, set the port shutdown mode to manual mode.

If the switch 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...
Enter system view
Use the command...
system-view
dldp delaydown-timer time
Use the command...
system-view
dldp unidirectional-shutdown { auto |
manual }
Use the command...
system-view
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Remarks
—
Optional
1 second by default
Remarks
—
Optional
auto by default
Remarks
—