Dell PowerConnect 7024, Manual

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Configuring Access Control Lists
Using ACLs to mirror traffic is considered to be flow-based mirroring since
the traffic flow is defined by the ACL classification rules. This is in contrast to
port mirroring, where all traffic encountered on a specific interface is
replicated on another interface.
What Is ACL Logging
ACL Logging provides a means for counting the number of “hits” against an
ACL rule. When you configure ACL Logging, you augment the ACL deny
rule specification with a "log" parameter that enables hardware hit count
collection and reporting. The switch uses a fixed five minute logging interval,
at which time trap log entries are written for each ACL logging rule that
accumulated a non-zero hit count during that interval. You cannot configure
the logging interval.
What Are Time-Based ACLs?
The time-based ACL feature allows the switch to dynamically apply an
explicit ACL rule within an ACL for a predefined time interval by specifying a
time range on a per-rule basis within an ACL, so that the time restrictions are
imposed on the ACL rule.
With a time-based ACL, you can define when and for how long an individual
rule of an ACL is in effect. To apply a time to an ACL, first you define a
specific time interval and then apply it to an individual ACL rule so that it is
operational only during the specified time range, for example, during a
specified time period or on specified days of the week.
A time range can be absolute (specific time) or periodic (recurring). If an
absolute and periodic time range entry are defined within the same time
range, the periodic timer is active only when the absolute timer is active.
NOTE:
Adding a conflicting periodic time range to an absolute time range will
cause the time range to become inactive. For example, consider an absolute time
range from 8:00 AM Tuesday March 1st 2011 to 10 PM Tuesday March 1st 2011.
Adding a periodic entry using the 'weekend' keyword will cause the time-range
to become inactive because Tuesdays are not on the weekend.