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4 Configuration DES-1210/ME Series Metro Ethernet Managed Switch User Manual
74
Figure 4.113 - QoS > CoS Scheduling Mechanism
Strict Priority: Denoting a Strict scheduling will set the highest queue to be emptied first while the other
queues will follow the weighted round-robin scheduling scheme
WRR: Use the weighted round-robin (WRR) algorithm to handle packets in an even distribution in priority
classes of service.
Click Apply to let your changes take effect.
QoS > CoS Output Scheduling
CoS can be customized by changing the output scheduling used for the hardware classes of service in the
Switch. As with any changes to CoS 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 you choose to customize this setting, it is important to
monitor network performance, especially during peak demand, as bottlenecks can quickly develop if the CoS
settings are not suitable.
Figure 4.114 - QoS > CoS Output Scheduling
Class ID: Specify the priority queue for the switch. The value is from 0 to 7.
Weight (1-55): Specify the weight for a CoS. The value is from 1 to 55.
Click Apply to let your changes take effect.
QoS > 802.1p Default Priority
QoS is an implementation of the IEEE 802.1p standard that allows network administrators to reserve
bandwidth for important functions that require a larger bandwidth or that might have a higher priority, such as
VoIP (voice-over Internet Protocol), web browsing applications, file server applications or video conferencing.
Thus with larger bandwidth, less critical traffic is limited, and therefore excessive bandwidth can be saved.
Figure 4.115 - QoS > 802.1p Default Priority
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