|
SmartSwitch Router User Reference Manual 181Chapter 11: QoS Configuration GuideConfigure Layer-2 QoSQoS policies applied to layer-2 flows allow you to assign priorities based on source anddestination MAC addresses. A QoS policy set for a layer-2 flow allows you to classify thepriority of traffic from:• A specific source MAC address to a specific destination MAC address (use only whenthe port is in flow bridging mode)• Any source MAC address to a specific destination MAC addressBefore applying a QoS policy to a layer-2 flow, you must first determine whether a port isin address-bridging mode or flow-bridging mode. If a port operates in address-bridgingmode (default) then you can specify the priority based on the destination MAC addressand a VLAN ID. You can also specify a list of ports to apply the policy.If 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 configure thepriority 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 Configure mode:Configuring Layer-3 & Layer-4 QoSQoS policies applied at layer-3 and 4 allow you to assign priorities based on specific fieldsin the IP and IPX headers. You can set QoS policies for IP flows based on source IPaddress, destination IP address, source TCP/UDP port, destination TCP/UDP port, typeof service (TOS) and transport protocol (TCP or UCP). You can set QoS policies for IPXflows based on source network, source node, destination network, destination node,source port and destination port. A QoS policy set on an IP or IPX flow allows you toclassify the priority of traffic based on:Set a Layer-2 QoSpolicy.qos set l2 name source-mac dest-mac vlan in-port-list prioritycontrol|high|medium|low|
|
