Alcatel-Lucent 7450 Quality Of Service Manual page 358

Service SAP QoS Policy Command Reference
Description This command is used to modify the size of each packet handled by the queue by adding or subtracting
a number of bytes. The actual packet size is not modified; only the size used to determine the bucket
depth impact is changed.
The packet-byte-offset command is meant to be an arbitrary mechanism the can be used to either add
downstream frame encapsulation or remove portions of packet headers.
When a packet-byte-offset value is applied to a queue instance, it adjusts the immediate packet size.
This means that the queue rates, i.e., operational PIR and CIR, and queue bucket updates use the
adjusted packet size. In addition, the queue statistics will also reflect the adjusted packet size.
Scheduler policy rates, which are data rates, will use the adjusted packet size.
The port scheduler max-rate and the priority level rates and weights, if a Weighted Scheduler Group
is used, are always on-the-wire rates and thus use the actual frame size. The same goes for the agg-rate-
limit on a SAP, a subscriber, or a Multi-Service Site (MSS) when the queue is port-parented.
When the user enables frame-based-accounting in a scheduler policy or queue-frame-based-
accounting with agg-rate-limit in a port scheduler policy, the queue rate will be capped to a user
configured on-the-wire rate but the packet-byte-offset value is still in effect as explained above. This
command is ignored on FP1 hardware.
The no form of this command is used to remove per packet size modifications from the queue.
Parameters add bytes — The add keyword is mutually exclusive to the subtract keyword. Either parameter
subtract bytes — The subtract keyword is mutually exclusive to the add keyword. Either
packet-byte-offset
Syntax packet-byte-offset {add bytes | subtract bytes}
no packet-byte-offset
Context config>qos>sap-ingress>queue
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must be specified. When add is defined, the corresponding bytes parameter specifies the
number of bytes that is added to the size of each packet associated with the queue for
scheduling and accounting purposes.
Values 0 to 32
Default None
parameter must be specified. When subtract is defined, the corresponding bytes parameter
specifies the number of bytes that is subtracted to the size of each packet associated with the
queue for scheduling and accounting purposes. The minimum resulting packet size used by
the system is 1 byte.
Values
0 to 64
Default None
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