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DES-3810 Series Layer 3 Managed Ethernet Switch Web UI Reference Guide
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HOL Blocking Prevention
HOL (Head of Line) Blocking happens when one of the destination ports of a broadcast or multicast packet are busy.
The switch will hold this packet in the buffer while the other destination port will not transmit the packet even they are
not busy. The HOL Blocking Prevention will ignore the busy port and forward the packet directly to have lower latency
and better performance.
On this page the user can enable or disable HOL Blocking Prevention.
To view the following window, click
QoS > HOL Blocking Prevention
, as shown below:
Figure 7-10 HOL Blocking Prevention window
The fields that can be configured are described below:
Parameter
Description
HOL Blocking Prevention
Global Settings
Here the user can enable of disable the HOL blocking prevention global settings.
Click the
Apply
button to accept the changes made.
Scheduling Settings
Scheduling Profile Settings
Changing the output scheduling used for the hardware queues in the Switch can customize the QoS. As with any
changes to the QoS implementation, careful consideration should be given to how network traffic in lower priority
queues are affected. Changes in scheduling may result in unacceptable levels of packet loss or significant
transmission delays. If you choose to customize this setting, it is important to the monitor network performance,
especially during peak demand, as bottlenecks can quickly develop if the QoS settings are not suitable.
To view the following window, click
QoS > Scheduling Settings > Scheduling Profile Settings
, as shown below:
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