Dell S4820T, Configuration Manual

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Mapping dot1p Values to Service Queues
All traffic is by default mapped to the same queue, Queue 0.
If you honor dot1p on ingress, you can create service classes based the queueing strategy in
Honoring
dot1p Values on Ingress Packets . You may apply this queuing strategy globally by entering the following
command from CONFIGURATION mode.
• All dot1p traffic is mapped to Queue 0 unless you enable
service-class dynamic dot1p
on an
interface or globally.
• Layer 2 or Layer 3 service policies supersede dot1p service classes.
• Create service classes.
INTERFACE mode
service-class dynamic dot1p
Guaranteeing Bandwidth to dot1p-Based Service Queues
To guarantee bandwidth to dot1p-based service queues, use the following command.
Apply this command in the same way as the
bandwidth-percentage
command in an output QoS
policy (refer to Allocating Bandwidth to Queue ). The
bandwidth-percentage
command in QOS-
POLICY-OUT mode supersedes the
service-class bandwidth-percentage
command.
• Guarantee a minimum bandwidth to queues globally.
CONFIGURATION mode
service-class bandwidth-percentage
Applying an Input Policy Map to an Interface
To apply an input policy map to an interface, use the following command.
You can apply the same policy map to multiple interfaces, and you can modify a policy map after you
apply it.
• You cannot apply an input Layer 2 QoS policy on an interface you also configure with vlan-stack
access.
• If you apply a service policy that contains an ACL to more than one interface, Dell Networking OS
uses ACL optimization to conserve CAM space. The ACL optimization behavior detects when an ACL
exists in the CAM rather than writing it to the CAM multiple times.
• Apply an input policy map to an interface.
INTERFACE mode
service-policy input
Specify the keyword
layer2
if the policy map you are applying a Layer 2 policy map.
Creating Output Policy Maps
1. Create an output policy map.
CONFIGURATION mode
Quality of Service (QoS)
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