Hol Blocking Prevention - D-Link DES-3528 - xStack Switch - Stackable Reference Manual

xStack® DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch Web UI Reference Guide
The fields that can be configured are described below:
Parameter
Unit
From Port / To Port
DSCP Map
DSCP List (0-63)
Color
Click the Apply button to accept the changes made.

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 6-10 DSCP Map Settings - DSCP Color window
Description
Select the unit to configure.
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 values to be mapped to a specific color.
Enter a DSCP List value.
Use the drop-down menu to specify the result color of the mapping.
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