D-Link DGS-1510-28P User Manual - Page 489
Example, mls qos trust, Parameters, Default, Command Mode, Command Default Level, Usage Guideline
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DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide WRR operates by transmitting permitted packets into the transmit queue in a round robin order. Initially, each queue sets its weight to a configurable weighting. Every time a packet from a higher priority CoS queue is sent, the corresponding weight is subtracted by 1, and the packet in the next lower CoS queue will be serviced. When the weight of a CoS queue reaches zero, the queue will not be serviced until its weight is replenished. When weights of all CoS queues reach 0, the weights get replenished at a time. Example This example shows how to configure the queue scheduling algorithm to the strict priority mode. Switch# configure terminal Switch(config)# interface eth3/0/1 Switch(config-if)# mls qos scheduler sp Switch(config-if)# 54-12 mls qos trust This command is used to configure the trust state of a port to trust either the CoS field or the DSCP field of the arriving packet for subsequent QoS operation. Use the no form of the command to revert to the default setting. mls qos trust {cos | dscp} no mls qos trust Parameters cos dscp Specifies that the CoS bits of the arriving packets are trusted for subsequent QoS operations. Specifies that the ToS/DSCP bits, if available in the arriving packets, are trusted for subsequent operations. For non-IP packet, Layer 2 CoS information will be trusted for traffic classification. Default By default, CoS is trusted. Command Mode Interface Configuration Mode. Command Default Level Level: 12. Usage Guideline When the interface is set to trust DSCP, the DSCP of the arriving packet will be trusted for the subsequent QoS operations. First, the DSCP will be mapped to an internal CoS value, which will be subsequently used to determine the CoS queue. The DSCP to CoS map is configured by the mls qos map dscp-cos command. The CoS to queue map is configured by the priority-queue cos-map command. If the arriving packet is a non-IP packet, the CoS is trusted. The resulting CoS mapped from DSCP will also be the CoS in the transmitted packet. When an interface is in the trust CoS state, the CoS of the arriving packet will be applied to the packet as the internal CoS and used to determine the CoS queue. The CoS queue is determined based on the CoS to Queue mapping table. When a packet arrives at an 802.1Q VLAN tunnel port, the packet will be added with an outer VLAN tag in order to transmit through the VLAN tunnel. If the port is to trust CoS, then the inner tag CoS will be the internal CoS of the packet and the CoS value in the packet's outer VLAN tag. If the MLS QoS CoS 486
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