Optional) Setting The Interface Blocking Mode - Huawei Quidway S3700 Series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Reliability
Step 2 Run:
dldp delaydown-timer time
The Delay Down timer is set.
By default, the Delay Down timer is 1 second.
If DLDP receives a Port-Down event when it is in Active, Advertisement, or Probe state, DLDP
will enter Inactive state and clear the neighbor information. In certain cases, the port is Down
for a very short time. For example, failure of the Tx fiber on a port may cause jitter of optical
signals on the Rx fiber, that is, the port becomes Down and then becomes Up again. To prevent
the neighbor information from being deleted immediately in this case, DLDP first enters the
DelayDown state and starts the DelayDown timer. Before the DelayDown timer times out, DLDP
retains the neighbor information and responds to only Port-Up events.
l If DLDP does not receive any Port-Up event when the DelayDown timer times out, it deletes
l If DLDP receives the Port-Up event before the DelayDown timer times out, it returns to the
The Delay Down timer applies to all DLDP interfaces.
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1.2.7 (Optional) Setting the Interface Blocking Mode

Context
When a unidirectional link is detected, DLDP blocks the corresponding interface in either of the
following ways:
l
l
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
dldp unidirectional-shutdown { auto | manual }
The mode of blocking interfaces when a unidirectional link fault is detected is set.
By default, DLDP automatically blocks the interface when a unidirectional link fault is detected.
Issue 01 (2011-10-26)
the neighbor information and enters the Inactive state.
previous state.
Manual mode: This mode can prevent DLDP from blocking the interface immediately to
affect packet forwarding when the network performance is poor. It is a compromise mode
used to prevent an interface from being blocked because of incorrect judgment of the
system. In this mode, DLDP detects the unidirectional link, and the network administrator
blocks the interface manually. When the DLDP state machine detects a unidirectional link,
the system records the log and sends trap messages to prompt you the network administrator
to block the interface manually. Then the DLDP state machine changes to the Disable state.
Automatic mode: It is the default mode. When a unidirectional link is detected, the DLDP
state machine changes to the Disable state, and the system records the log, sends trap
messages, and sets the interface state to Blocking.
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