Allied-telesis AT-S63 User Manual Page 192

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Chapter 15: Quality of Service
192 Section II: Advanced Operations
Exceed Action
Specifies the action to be taken if the traffic of the traffic class exceeds
the maximum bandwidth. There are two possible exceed actions, drop
and remark. If drop is selected, traffic exceeding the bandwidth is
discarded. If remark is selected, the packets are forwarded after
replacing the DSCP value with the new value specified in Exceed
Remark Value. The default is drop.
Exceed Remark Value
Specifies the DSCP replacement value for traffic that exceeds the
maximum bandwidth. This value takes precedence over the DSCP
value. The default is 0.
DSCP Value
Specifies a replacement value to write into the DSCP (TOS) field of the
packets. The range is 0 to 63.
A new DSCP value can be set at all three levels: flow group, traffic
class, and policy. A DSCP value specified in a flow group overrides a
DSCP value specified at the traffic class or policy level. A DSCP value
specified at the traffic class level is used only if no value has been
specified at the flow group level. It will override any value set at the
policy level.
Max Bandwidth
Specifies the maximum bandwidth available to the traffic class. The
range is 0 to 1016 Mbps.
This parameter determines the maximum rate at which the ingress port
accepts packets belonging to this traffic class before either dropping or
remarking occurs, depending on the Exceed Action parameter. If the
sum of the maximum bandwidth for all traffic classes on a policy
exceeds the (ingress) bandwidth of the port to which the policy is
assigned, the bandwidth for the port takes precedence and the port
discards packets before they can be classified.
The value for this parameter is rounded up to the nearest Mbps value
when this traffic class is assigned to a policy on a 10/100 port, and up
to the nearest 8 Mbps value when assigned to a policy on a gigabit
port (for example, on a gigabit port, 1 Mbps is rounded to 8 Mbps, and
9 is rounded to 16).
Note
If this option is set to 0 (zero), all traffic that matches the traffic class
is dropped. However, an access control list can be created to match
the traffic that is marked for dropping, or a subset of it, and given an
action of permit, to override this. This functionality can be used to
discard all but a certain type of traffic.
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