Dell PowerConnect 6024 User's Guide (.htm) - Page 413
Mapping to Queues, interface see Advanced QoS Mode.
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There are two ways to apply ACLs to an interface: • Policy - In this form, ACLs are grouped together into a more complex structure, called a policy. The policy can contain both ACLs and QoS rules. The user can apply the policy to an interface (see "Advanced QoS Mode"). • Simple - In the simple form, a single (MAC or IP) ACL is applied to an interface. Although a policy cannot be applied to an interface, it is possible to apply basic QoS rules that classify packets to output queues (see "Basic QoS Mode"). Mapping to Queues A Trust Behavior can be selected, or the output service fields can be selected, including: • VLAN Priority Tags (VPT) - VPTs are mapped to an output queues based on the VPT. While queue mapping is user-configurable, the VPT default mapping to the output queue is as follows. In the VPT default mapping, Queue 1 has the lowest priority, as shown in the following table: Table 10-1. VPT Default Mapping Table VPT Value 0 1 2 3 4 5 6 7 Queue Number 3 1 2 4 5 6 7 8 NOTE: Mapping of the VPT to the output queue is performed on a system-wide basis, and can be enabled or disabled per port. • 802.1p Port-Based - Packets arriving untagged are assigned to a default VPT, which can be set by the user on a per port basis. Once the VPT is assigned, the packet is treated as if it had arrived with this tag. The VPT mapping to the output queue is based on the same userdefined 802.1p tag-based definitions. • Layer 3 Predefined Field - The user can configure the system to use the IP DSCP of the incoming packet to the output priority queues. The mapping of the IP DSCP to priority queue is set on a per system basis. If this mode is active, a non-IP packet will always be classified to the best effort queue. The default mapping is shown in the following table: Configuring Quality of Service 423
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