Administrator Guide

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#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 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.
Conguring Port-Based Rate Policing
If the interface is a member of a VLAN, you may specify the VLAN for which ingress packets are policed.
• Rate policing ingress trac on an interface.
INTERFACE mode
rate police
Example of the rate police Command
Dell#config t
Dell(conf)#interface tengigabitethernet 1/0
Dell(conf-if)#rate police 100 40 peak 150 50
Dell(conf-if)#end
Dell#
Conguring Port-Based Rate Shaping
Rate shaping buers, rather than drops, trac that exceeds the specied rate until the buer is exhausted.
If any stream exceeds the congured bandwidth on a continuous basis, it can consume all of the buer space that is allocated to the
port.
• Apply rate shaping to outgoing trac on a port.
INTERFACE mode
Quality of Service (QoS)
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