Dell PowerConnect B-RX BigIron RX Series Configuration Guide v02.7.02 - Page 541

18 Marking Configuring port, MAC, and VLAN-based classification Assigning QoS priorities to traffic By default, traffic is forwarded using the best-effort queue (qosp0). However, traffic can be classified into different priorities, based on the following: • Incoming port (sometimes called the ingress port) • Port-based VLAN membership • Static MAC entry The following sections describe how to change the priority for each of the items listed above. Although it is possible for a packet to qualify for an adjusted QoS priority based on more than one of the criteria above, the system determines the priority it will use for forwarding as described in "Processing of classified traffic" on page 466. When you apply a QoS priority to one of the items listed above, you specify a number from 0 - 7. The priority number specifies the IEEE 802.1p equivalent to one of the four Brocade QoS queues. The numbers correspond to the queues as follows. Priority level 6, 7 4, 5 2, 3 0, 1 QoS forwarding queue 3 2 1 0 Changing a port's priority To change a port's QoS priority, use one of the following methods. The priority applies to inbound traffic on the port. The default priority of each port is 0. To change the QoS priority of port 1/1 on a device to queue 2, enter the following commands. BigIron RX(config)# interface ethernet 1/1 BigIron RX(config-if-e1000-1/1)# priority 5 Syntax: [no] priority The parameter can be from 0 - 7 and specifies the priority level equivalent to one of the four QoS queues. Changing a Layer 2 port-based VLAN's priority By default, VLANs have priority 0. To change a port-based VLAN's QoS priority, use one of the following methods. The priority applies to inbound traffic on ports in the VLAN. To change the QoS priority of port-based VLAN 20 to queue 3, enter the following commands. BigIron RX(config)# vlan 20 BigIron RX(config-vlan-20)# priority 7 Syntax: [no] priority BigIron RX Series Configuration Guide 469 53-1001810-01