Extreme Networks Policy Manager User Manual page 76

Help Messages
count
delta
ratio
delta-ratio
rule-true-count
76
A CLEAR-Flow count expression compares a counter with the threshold value.
Beginning in ExtremeXOS release 11.4, the value of <countThreshold> and
<hysteresis> can be specified as floating point numbers. 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,
greater than or equal to, less than, or less than or equal to (>, >=, <, <=). The
hysteresis <hysteresis> statement is optional, and sets a hysteresis value
for the threshold. After the count statement is true, the value of the threshold
is adjusted so that a change smaller than the hysteresis value will not cause
the statement to become false. For statements using the REL_OPER > or >=,
the hysteresis value is subtracted from the threshold; for < or <=, the
hysteresis value is added to the threshold.
A CLEAR-Flow delta expression computes the difference from one sample to
the next of a counter value. This difference is compared with the threshold
value. Beginning in ExtremeXOS release 11.4, the value of
<countThreshold> and <hysteresis> can be specified as floating point
numbers. The delta expression 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, greater than or equal to, less than, or
less than or equal to (>, >=, <, <=).
A CLEAR-Flow ratio expression compares the ratio of two counter values with
the threshold value. Beginning in ExtremeXOS release 11.4, the value of
<countThreshold> and <hysteresis> can be specified as floating point
numbers, and the ratio is computed as a floating point number. The ratio
statement specifies how to compare the ratio of two counters with its
threshold. The value of <counterNameA> is divided by the value of
<counterNameB>, to compute the ratio. That ratio is compared with the
<countThreshold>. The REL_OPER is selected from the relational operators
for greater than, greater than or equal to, less than, or less than or equal to (>,
>=, <, <=). The min-value statement is optional, and sets a minimum value for
the counters. If either counter is less than the minimum value, the expression
evaluates to false. If not specified, the minimum value is 1.
A CLEAR-Flow delta-ratio expression is a combination of the delta and ratio
expressions. The CLEAR-Flow agent computes the difference from one sample
to the next for each of the two counters. The ratio of the differences is then
compared to the threshold value. Beginning in ExtremeXOS release 11.4, the
value of <countThreshold> and <hysteresis> can be specified as
floating point numbers, and the delta-ratio is computed as a floating point
number. The delta-ratio statement specifies how to compare the ratio of
the counter differences with its threshold. The difference of the sample values
of <counterNameA> is divided by the difference of the sample values of
<counterNameB>, to compute the ratio that is compared with the
<countThreshold>. The REL_OPER is selected from the relational operators
for greater than, greater than or equal to, less than, or less than or equal to (>,
>=, <, <=).
A CLEAR-Flow rule-true-count expression compares how many times a CLEAR-
Flow rule is true with a threshold value. One use is to combine multiple rules
together into a complex rule. The rule-true-count statement specifies how
to compare how many times a CLEAR-Flow rule is true with the expression
threshold. The <ruleName> is the name of the CLEAR-Flow rule to monitor
and the <countThreshold> is the value compared with the number of times
the rule is true. The REL_OPER is selected from the relational operators for
greater than, greater than or equal to, less than, or less than or equal to (>,
>=, <, <=).
Extreme Networks Policy Manager (EPM) 1.2 User Guide