Configuring Port-Based Rate Policing; Configuring Port-Based Rate Shaping - Dell S4048T Configuration Manual

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
rate police
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

Configuring Port-Based Rate Shaping

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
rate shape
• Apply rate shaping to a queue.
QoS Policy mode
rate-shape
Example of rate shape Command
Dell#configure terminal
Dell(conf)#interface tengigabitethernet 1/1
Quality of Service (QoS) 837