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Chapter 10: QoS Configuration GuideSSR User Reference Manual10 - 3If a port operates in flow-bridging mode, the user can be more specific and configurepriorities for frames that match both a source AND a destination MAC address and aVLAN ID. You can also specify a list of ports to apply the policy.Note: In flow mode, you can also ignore the source MAC address and configurethe priority based on the destination MAC address only.When applying QoS to a layer-2 flow, priority can be assigned as follows:• The frame gets assigned a priority within the switch. Select “low, medium, high orcontrol”.• The frame gets assigned a priority within the switch, AND if the exit ports are trunkports, the frame is assigned an 802.1Q priority. Select a number from 0 to 7. Themapping of 802.1Q to internal priorities is the following: (0 = low) (1,2,3 =medium)(4,5,6 = high) (7 = control)To set a QoS policy on a layer-2 flow, enter the following command in Configuremode:Configure Layer-3 and 4 QoSQoS policies applied at layer-3 and 4 allow you to assign priorities based on specificfields in the IP and IPX headers. You can set QoS policies for IP flows based on sourceIP address, destination IP address, source TCP/UDP port, destination TCP/UDP port,type of service (TOS) and transport protocol (TCP or UCP). You can set QoS policiesfor IPX flows based on source network, source node, destination network, destinationnode, source port and destination port. A QoS policy set on an IP or IPX flow allowsyou to classify the priority of traffic based on:• Layer-3 source-destination flows• Layer-4 source-destination flows• Layer-4 application flowsConfigure IP QoS PoliciesTo configure an IP QoS policy, perform the following tasks:1. Identify the Layer-3 or 4 flow and set the IP QoS policy.Set a layer-2 QoS policy. qos set l2 name source-macdest-mac vlanin-port-listpriority control|high|medium|low|priority>
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