6-19
Configuring and Monitoring Port Security
Reading Intrusion Alerts and Resetting Alert Flags
(The intrusion log holds up to 20 intrusion records and deletes an
intrusion record only when the log becomes full and a new intrusion
is subsequently detected.)
Note also that the “prior to” text in the record for the earliest intrusion
means that a switch reset occurred at the indicated time and that the
intrusion occurred prior to the reset.
3. To acknowledge the most recent intrusion entry on port A3 and enable
the switch to enter a subsequently detected intrusion on this port, type
(for Reset alert flags). (Note that if there are unacknowledged intrusions
on two or more ports, this step resets the alert flags for all such ports.)
If you then re-display the port status screen, you will see that the Intrusion
Alert entry for port A3 has changed to “No”. That is, your evidence that the
Intrusion Alert flag has been acknowledged (reset) is that the Intrusion Alert
column in the port status display no longer shows “
Yes” for the port on which
the intrusion occurred (port A3 in this example). (Because the Intrusion Log
provides a history of the last 20 intrusions detected by the switch, resetting
the alert flags does not change its content. Thus, displaying the Intrusion Log
again will result in the same display as in figure 6-12, above.)
CLI: Checking for Intrusions, Listing Intrusion Alerts, and
Resetting Alert Flags
The following commands display port status, including whether there are
intrusion alerts for any port(s), list the last 20 intrusions, and either reset the
alert flag on all ports or for a specific port for which an intrusion was detected.
(The record of the intrusion remains in the log. For more information, refer
to “Operating Notes for Port Security” on page 6-22.)
In the following example, executing show interfaces brief lists the switch’s port
status, which indicates an intrusion alert on port A1.
Syntax: show interfaces brief
List intrusion alert status (and other port status informa-
tion)’.
show port-security intrusion-log
List intrusion log content.
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.
!FishSecurity.book Page 19 Thursday, October 10, 2002 9:19 PM
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