Configuring and Monitoring Port Security
Reading Intrusion Alerts and Resetting Alert Flags
clear intrusion-flags
Clear intrusion flags on all ports.
port-security [e] < port-number > clear-intrusion-flag
Clear the intrusion flag on one or more specific ports.
In the following example, executing
show interfaces brief
lists the switch’s port
status, which indicates an intrusion alert on port A1.
Intrusion Alert on port
Figure 11-16.Example of an Unacknowledged Intrusion Alert in a Port Status Display
If you wanted to see the details of the intrusion, you would then enter the
show
port-security intrusion-log
command. For example:
Dates and Times of
Intrusions
MAC Address of latest
Intruder on Port A1
Earlier intrusions on
port A1 that have
already been cleared
(that is, the Alert Flag
has been reset at least
twice before the most
recent intrusion
Figure 11-17.Example of the Intrusion Log with Multiple Entries for the Same Port
The above example shows three intrusions for port A1. Since the switch can
show only one uncleared intrusion per port, the older two intrusions in this
example have already been cleared by earlier use of the
clear intrusion-log
or
the
port-security <
port-list
> clear-intrusion-flag
command. (The intrusion log
holds up to 20 intrusion records, and deletes intrusion records only when the
log becomes full and new intrusions are subsequently added.) The “
prior to
”
text in the record for the third intrusion means that a switch reset occurred
at the indicated time and that the intrusion occurred prior to the reset.
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