Alcatel-Lucent 1643 AMS User's Operation Manual page 387

Traffic provisioning
The QoS edge ports support upto seven provisionable flows of 1k per unit and can be
defined with a combination of the following criteria:
• flow = port
• flow = C-Tag (C-VID, C-UP) previously known as: VID, UP
• flow = IP-TOS field (DSCP)
• flow = Destination address mask (for broadcast/multicast and for customer control
traffic)
Additionally, a default flow for each user is already present. When ports are designated
as "Interior", the flow classification is completely based on the S-UPT bits. There is no
rate control and the S-UPT bits are transparently transported through the device.
Virtual ports on a trunk port can be provisioned to behave as "Interior" ports, i.e. to
use the S-UPT bits for classification instead of the freely provisionable flow. By
provisioning a (virtual) port as an "Interior" port, the flow definition is fixed.
Enhanced Flow Properties
The 1643 AM/AMS supports enhanced flow classification properties that can be
provisioned for each flow. Users can provision the properties of each flow by assigning
a traffic class and provisioning the threshold rate. For example, immediate dropping
(strict policing: CIR=PIR) or marking with high dropping precedence
(over-subscription: CIR<= PIR<=MAX). The assigned traffic class and dropping
precedence are coded into the S-UPT bits of the frame on the egress side.
The X5IP option card supports Committed Burst Size (CBS) and Peak Burst Size
(PBS) provisioning. Users can provision the CBS and PBS parameters to QoS profiles
for IEEE 802.1Q and IEEE 802.1ad modes.
QoS provisioning in Provider Bridge Mode (PBM)
The X5IP option card supports Flow Classification of ingress traffic into the L2 switch
based on the IEEE 802.1Q tagging mode. For every Flow Classification, users can
assign a Flow Profile containing the QoS parameters that are to be applied to the flow.
A Flow Profile can be labeled and pre-provisioned. It can be assigned to multiple flows
and contains the following parameters:
• Traffic conditioning parameters such as TransLAN® ingress rate control parameters
including dropping precedence marking.
Frames below CIR are classified as "green" (low dropping precedence). Frames
between CIR and PIR are classified as "yellow" (high dropping precedence).
Frames above PIR are classified as "red" and are dropped. The high or low
dropping precedence is encoded in the LSB of the user_priority field of the S-TAG.
• Traffic class flow assignment including traffic class marking indicating a certain
service level.
Users can assign a traffic class for each flow which determines the value of the 2
MSB user_priority bits in the S-TAG of the frames that are classified to the flow.
The relation between the assigned traffic class and the 2 MSB user_priority bits is
fixed. Based on the traffic class, the frame will be assigned to a certain queue by a
fixed traffic class to queue mapping function that is present in each switch.
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365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
Ethernet over SDH
8-35