Allied Telesis AT-S63 User Manual

Page 394

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Chapter 21: Quality of Service (QoS) Commands

394

Section II: Advanced Operations

If the traffic is below the maximum bandwidth,

unused tokens will accumulate in the bucket since
the actual bandwidth falls below the specified
maximum. The unused tokens will be available for
handling excess traffic should the traffic exceed the
maximum bandwidth. Should an increase in traffic
continue to the point where all the unused tokens
are used up, packets will be discarded.

Unused tokens accumulate in the bucket until the

bucket reaches maximum capacity, set by this
parameter. Once the maximum capacity of the
bucket is reached, no extra tokens are added. The
range is 4 to 512 Kbps.

This parameter must be used with the

MAXBANDWIDTH parameter. Specifying a token
bucket size without also specifying a maximum
bandwidth serves no function.

priority

Specifies the priority value in the IEEE 802.1p tag

control field of the traffic specified by the traffic
class. Priority values range from 0 to 7 with 0 being
the lowest priority and 7 being the highest priority.
Incoming frames are mapped into one of eight
Class of Service (CoS) queues based on the priority
value.

If you want the packets to retain the new value
when they exit the switch, use the
REMARKPRIORITY parameter.

A new priority can be set at both the flow group and
traffic class levels. If it is set in both places, the
value in the flow group overrides the value in the
traffic class.

remarkpriority

Replaces the user priority value in the packets with
the new value specified with the PRIORITY
parameter. This parameter is ignored if the
PRIORITY parameter is omitted or set to NONE.
Options are:

yes, on, true

Replaces the user priority value in

the packets with the new value
specified with the PRIORITY
parameter.

no, off, false

Does not replace the user priority

value in the packets with the new
value specified in with the PRIORITY

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