Reference Guide

Setting dot1p Priorities for Incoming Traffic
Dell Networking OS places traffic marked with a priority in a queue based on the following table.
If you set a dot1p priority for a port-channel, all port-channel members are configured with the same
value. You cannot assign a dot1p value to an individual interface in a port-channel.
• Change the priority of incoming traffic on the interface.
dot1p-priority
Example of Configuring a dot1p Priority on an Interface
Dell#config
Dell(conf)#interface tengigabitethernet 1/0
Dell(conf-if)#switchport
Dell(conf-if)#dot1p-priority 1
Dell(conf-if)#end
Dell#
Honoring dot1p Priorities on Ingress Traffic
By default, Dell Networking OS does not honor dot1p priorities on ingress traffic.
You can configure this feature on physical interfaces and port-channels, but you cannot configure it on
individual interfaces in a port channel.
You can configure service-class dynamic dot1p from CONFIGURATION mode, which applies the
configuration to all interfaces. A CONFIGURATION mode service-class dynamic dot1p entry supersedes
any INTERFACE entries. For more information, refer to Mapping dot1p Values to Service Queues.
NOTE: You cannot configure service-policy input and service-class dynamic dot1p on
the same interface.
• Honor dot1p priorities on ingress traffic.
INTERFACE mode
service-class dynamic dot1p
Example of Configuring an Interface to Honor dot1p Priorities on Ingress Traffic
Dell#config t
Dell(conf)#interface tengigabitethernet 1/0
Dell(conf-if)#service-class dynamic dot1p
Dell(conf-if)#end
Dell#
Priority-Tagged Frames on the Default VLAN
Priority-tagged frames on the default VLAN is available on the S4820T platform.
Priority-tagged frames are 802.1Q tagged frames with VLAN ID 0. For VLAN classification, these packets
are treated as untagged. However, the dot1p value is still honored when you configure service-class
dynamic dot1p or trust dot1p.
When priority-tagged frames ingress an untagged port or hybrid port, the frames are classified to the
default VLAN of the port and to a queue according to their dot1p priority if you configure service-
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Quality of Service (QoS)