D-Link DGS-3426P Product Manual - Page 239

xStack® DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch HOL Prevention Settings This window is used to enable or disable Head of Line (HOL) prevention. To view the HOL Prevention Settings window, click QoS > HOL Prevention Settings, as shown below. Figure 4 - 6 Per Queue Bandwidth Control Settings window Use the drop-down menu to enable or disable head of line prevention. The default is Enabled. Click Apply to implement the change. Schedule Settings QoS Output Scheduling Settings QoS can be customized by changing the output scheduling used for the hardware classes of service in the Switch. As with any changes to QoS implementation, careful consideration should be given to how network traffic in lower priority classes of service is affected. Changes in scheduling may result in unacceptable levels of packet loss or significant transmission delay. If choosing to customize this setting, it is important to monitor network performance, especially during peak demand, as bottlenecks can quickly develop if the QoS settings are not suitable. To view this window, click QoS > Schedule Settings > QoS Output Scheduling Settings, as shown below. 230