Configuring Port-Based Rate Policing; Configuring Port-Based Rate Shaping - Dell S4048–ON Configuration Manual

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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-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.

Configuring 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 traffic on an interface.

INTERFACE mode

Example of the rate police Command

The following example shows configuring rate policing.

Dell#configure terminal

Dell(conf)#interface tengigabitethernet 1/1

Dell(conf-if-te-1/1)#rate police 100 40 peak 150 50

Dell(conf-if-te-1/1)#end

Rate shaping buffers, rather than drops, traffic exceeding the specified rate until the buffer is exhausted. If any stream exceeds the

configured 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 is

slightly 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 the

configured 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 mode

Apply rate shaping to a queue.

QoS Policy mode

Example of rate shape Command

Dell#configure terminal

Dell(conf)#interface tengigabitethernet 1/1

Dell(conf-if-te-1/1)#rate shape 500 50

Dell(conf-if-te-1/1)#end

Quality of Service (QoS)