When priority-tagged frames ingress an untagged port or hybrid port, the frames are classified to the default VLAN of the port and to aqueue according to their dot1p priority if you configure service-class dynamic dotp or trust dot1p. When priority-taggedframes 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 mightbe inaccurate for untagged ports because an internal assumption is made that all frames are treated as tagged. Internally, the ASIC adds a4-bytes tag to received untagged frames. Though these 4-bytes are not part of the untagged frame received on the wire, they are includedin the rate metering calculation resulting in metering inaccuracy.Configuring Port-Based Rate PolicingIf the interface is a member of a VLAN, you may specify the VLAN for which ingress packets are policed.• Rate policing ingress traffic on an interface.INTERFACE moderate policeExample of the rate police CommandThe following example shows configuring rate policing.Dell#configure terminalDell(conf)#interface tengigabitethernet 1/1/1/1Dell(conf-if-te-1/1/1/1)#rate police 100 40 peak 150 50Dell(conf-if-te-1/1/1/1)#endConfiguring Port-Based Rate ShapingRate shaping buffers, rather than drops, traffic exceeding the specified rate until the buffer is exhausted. If any stream exceeds theconfigured bandwidth on a continuous basis, it can consume all of the buffer space that is allocated to the port.Dell Networking OS Behavior: Rate shaping is effectively rate limiting because of its smaller buffer size. Rate shaping on tagged ports isslightly greater than the configured rate and rate shaping on untagged ports is slightly less than configured rate.Rate shaping buffers, rather than drops, traffic exceeding the specified rate until the buffer is exhausted. If any stream exceeds theconfigured bandwidth on a continuous basis, it can consume all of the buffer space that is allocated to the port.• Apply rate shaping to outgoing traffic on a port.INTERFACE moderate shape• Apply rate shaping to a queue.QoS Policy moderate-shapeExample of rate shape CommandDell#configure terminalDell(conf)#interface tengigabitethernet 1/1/1/1Dell(conf-if-te-1/1/1/1)#rate shape 500 50Dell(conf-if-te-1/1/1/1)#endQuality of Service (QoS) 699
