Extreme Networks ExtremeWare XOS 11.1, Руководство пользователя

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CLEARFlow
ExtremeWare XOS 11.1 Concepts Guide
256
Count Rule Type
A CLEARFlow count rule compares a counter with the threshold value. The following is the syntax for
a CLEARFlow count rule:
entry <CLFrulename> {
if { count <counterName> REL_OPER <countThreshold> ;
period <interval>;
}
then {
<actions>;
} else {
<actions>;
}
}
The
count
statement specifies how to compare a counter with its threshold. The
<counterName>
is the
name of an ACL counter referred to by an ACL rule entry and the
<countThreshold>
is the value
compared with the counter. The
REL_OPER
is selected from the relational operators for greater than,
great than or equal to, less than, or less than or equal to (>, >=, <, <=).
The
period <interval>
statement is optional and sets the sampling interval, in seconds. This
statement specifies how often the rule is evaluated by the CLEARFlow agent. If not specified, the
default value is 5 seconds.
The actions will be discussed in the section, “CLEARFlow Rule Actions” on page 259 .
See the section, “Count Rule Type Example” on page 261 , for an example.
Delta Rule Type
A CLEARFlow delta rule computes the difference from one sample to the next of a counter value. This
difference is compared with the threshold value. The following is the syntax for a CLEARFlow delta
rule:
entry <CLFrulename> {
if { delta <counterName> REL_OPER <countThreshold> ;
period <interval>;
hysterisis <hysterisis> ;
}
then {
<actions>;
} else {
<actions>;
}
}
The
delta
statement specifies how to compare the difference in a counter value from one sample to the
next with its threshold. The
<counterName>
is the name of an ACL counter referred to by an ACL rule
entry and the
<countThreshold>
is the value compared with the difference in the counter from one
sample to the next. The
REL_OPER
is selected from the relational operators for greater than, great than or
equal to, less than, or less than or equal to (>, >=, <, <=).