Hol Blocking Prevention - D-Link DGS-3000 Series Reference Manual

The fields that can be configured are described below:
Parameter
From Port / To Port
DSCP Map
DSCP List (0-63)
Priority
DSCP (0-63)
Port
Color
Click the Apply button to accept the changes made.
Click the Find button to locate a specific entry based on the information entered.

HOL Blocking Prevention

Head of Line (HOL) 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 reduce latency and increase
performance.
This window is used to enable or disable HOL Blocking Prevention.
To view the following window, click QoS > HOL Blocking Prevention as shown below:
DGS-3000 Series Gigabit Ethernet Switch Web UI Reference Guide
Figure 6-11 DSCP Map Settings - DSCP Color window
Description
Use the drop-down menu to select a range of port to configure.
Use the drop-down menu to select one of two options:
DSCP Priority – Specify a list of DSCP values to be mapped to a specific priority.
DSCP DSCP – Specify a list of DSCP value to be mapped to a specific DSCP.
DSCP Color - Specify a list of DSCP value to be mapped to a specific color.
Enter a DSCP List value.
Use the drop-down menu to select a Priority value. This appears when selecting
DSCP Priority in the DSCP Map drop-down menu.
Enter a DSCP value. This appears when selecting DSCP DSCP in the DSCP Map
drop-down menu.
Use the drop-down menu to select a port. This appears when selecting DSCP DSCP
in the DSCP Map drop-down menu.
Use the drop-down menu to select the result color of the mapping. This appears when
selecting DSCP Color in the DSCP Map drop-down menu.
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