Users Guide

dot1p Queue Number
3 1
4 2
5 3
6 3
7 3
• Change the priority of incoming trac on the interface.
dot1p-priority
Example of Conguring a dot1p Priority on an Interface
Dell#configure terminal
Dell(conf)#interface gigabitethernet 1/1
Dell(conf-if-gi-1/1)#switchport
Dell(conf-if-gi-1/1)#dot1p-priority 1
Dell(conf-if-gi-1/1)#end
Honoring dot1p Priorities on Ingress Trac
By default, Dell Networking OS does not honor dot1p priorities on ingress trac.
You can congure this feature on physical interfaces and port-channels, but you cannot congure it on individual interfaces in a port
channel.
You can congure service-class dynamic dot1p from CONFIGURATION mode, which applies the conguration 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 congure service-policy input and service-class dynamic dot1p on the same interface.
• Honor dot1p priorities on ingress trac.
INTERFACE mode
service-class dynamic dot1p
Example of Conguring an Interface to Honor dot1p Priorities on Ingress Trac
Dell#configure terminal
Dell(conf)#interface gigabitethernet 1/1
Dell(conf-if-gi-1/1)#service-class dynamic dot1p
Dell(conf-if-gi-1/1)#end
Priority-Tagged Frames on the Default VLAN
Priority-tagged frames are 802.1Q tagged frames with VLAN ID 0. For VLAN classication, these packets are treated as untagged.
However, the dot1p value is still honored when you congure service-class dynamic dot1p or trust dot1p.
When priority-tagged frames ingress an untagged port or hybrid port, the frames are classied to the default VLAN of the port and to a
queue according to their dot1p priority if you congure service-class dynamic dotp or trust dot1p. When priority-tagged
frames ingress a tagged port, the frames are dropped because, for a tagged port, the default VLAN is 0.
Dell Networking OS Behavior: Hybrid ports can receive untagged, tagged, and priority tagged frames. The rate metering calculation might
be inaccurate for untagged ports because an internal assumption is made that all frames are treated as tagged. Internally, the ASIC adds a
4-bytes tag to received untagged frames. Though these 4-bytes are not part of the untagged frame received on the wire, they are included
in the rate metering calculation resulting in metering inaccuracy.
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Quality of Service (QoS)