Dell PowerConnect 7048P User Manual - Page 1129

Continuing this example, the egress port 1/0/8 is configured for strict priority on queue 6, and a weighted scheduling scheme is configured for queues 5-0. Assuming queue 5 has a higher weighting than queue 1 (relative weight values shown as a percentage, with 0% indicating the bandwidth is not guaranteed), the queue service order is 6 followed by 5 followed by 1. Assuming each queue unloads all packets shown in the diagram, the packet transmission order as seen on the network leading out of Port 1/0/8 is B, A, D, C. Thus, packet B, with its higher user precedence than the others, is able to work its way through the device with minimal delay and is transmitted ahead of the other packets at the egress port. The following commands configure Port 10 (ingress interface) and Port 8 (egress interface). 1 Configure the Trust mode for Port 10. console#config console(config)#interface gigabitethernet 1/0/10 console(config-if-Gi1/0/10)#classofservice trust dot1p 2 For Port 10, configure the 802.1p user priority 3 to send the packet to queue 5 instead of the default queue (queue 3). console(config-if-Gi1/0/10)#classofservice dot1pmapping 3 5 3 For Port 10, specify that untagged VLAN packets should have a default priority of 2. console(config-if-Gi1/0/10)#vlan priority 2 console(config-if-Gi1/0/10)#exit 4 For Port 8, the egress port, configure a weighted scheduling scheme for queues 5-0. console(config)#interface gigabitethernet 1/0/8 console(config-if-Gi1/0/8)#cos-queue minbandwidth 0 0 5 5 10 20 40 5 Configure Port 8 to have strict priority on queue 6. console(config-if-Gi1/0/8)#cos-queue strict 6 Configuring Class-of-Service 1129