Configuring Port-Based Rate Policing; Configuring Port-Based Rate Shaping - Dell Force10 Z9000 Configuration Manual

NOTE: You cannot configure service-policy input and service-class dynamic dot1p on the same
interface.
• Honor dot1p priorities on ingress traffic.
INTERFACE mode
service-class dynamic dot1p
Example of Configuring an Interface to Honor dot1p Priorities on Ingress Traffic
Dell#configure terminal
Dell(conf)#interface tengigabitethernet 1/1
Dell(conf-if-te-1/1)#service-class dynamic dot1p
Dell(conf-if-te-1/1)#end
Priority-Tagged Frames on the Default VLAN
Priority-tagged frames are 802.1Q tagged frames with VLAN ID 0. For VLAN classification, these packets are treated as untagged.
However, the dot1p value is still honored when you configure service-class dynamic dot1p or trust dot1p.
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
rate police
Example of the rate police Command
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

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
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Quality of Service (QoS)