Network Queue QoS Policies
238
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
There are three modes of packet-byte-offset operation:
• no packet-byte-offset — enables legacy behavior so that no modification is performed
• packet-byte-offset — automatic adjustment mode. Rates apply to packets based on
the received packet size at ingress (this is also known as packet size on the wire, less
the Layer-1 headers, the inter-frame GAP and the Preamble) and to the transmitted
packet size at egress, which includes 4-bytes of Ethernet FCS. At ingress, all internal
headers and associated service headers are discounted during scheduling operation. At
egress 4-bytes are added to accommodate for Ethernet FCS.
• packet-byte-offset [add bytes | subtract bytes]— automatic correction followed by
addition or subtraction of a specified number of bytes. This command first performs the
packet-byte-offset operation as captured above and then adds or subtracts a certain
number of bytes. Rates apply to packets based on the size of the packet at the ingress
or egress port plus or minus an offset.
Packet byte offset configuration can be applied at the policy level, in which case it applies to
all of the queues within the policy, or at the individual queue level so that it applies only to a
specific queue.
The no version of this command enables legacy 7705 SAR behavior where the queue rates
are relative to the packet size with the internal fabric header added, but without the FCS.
Parameters add bytes — after automatic adjustment for internal headers (for example, added FCS or
removal of internal service/overhead), adds the specified number of bytes to each
packet associated with the queue for scheduling and accounting purposes. From the
queue’s perspective, the packet size is increased by the amount being added to each
packet.
Values 2 to 62, in steps of 2
subtract bytes — after automatic adjustment for internal headers (for example, added
FCS or removal of internal service/overhead), subtracts the specified number of
bytes from each packet associated with the queue for scheduling and accounting
purposes. From the queue’s perspective, the packet size is reduced by the amount
being subtracted from each packet.
Values 2 to 62, in steps of 2
none — the packet size is left unchanged
queue
Syntax queue queue-id multipoint [queue-type] [create]
no queue queue-id
Context config>qos>network-queue
Description This command enables the context to configure a QoS network-queue policy queue. Network
queues are created with default queue 1 (non-multipoint) and queue 9 (multipoint)
automatically assigned.
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