Cisco ASA 5505 - Manual (Page 1191)

56-5
Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 56 Configuring Threat Detection
Configuring Basic Threat Detection Statistics
Monitoring Basic Threat Detection Statistics
To monitor basic threat detection statistics, perform one of the following tasks:
Examples
The following is sample output from the show threat-detection rate command:
hostname# show threat-detection rate
Average(eps) Current(eps) Trigger Total events
10-min ACL drop: 0 0 0 16
1-hour ACL drop: 0 0 0 112
1-hour SYN attck: 5 0 2 21438
10-min Scanning: 0 0 29 193
1-hour Scanning: 106 0 10 384776
1-hour Bad pkts: 76 0 2 274690
10-min Firewall: 0 0 3 22
1-hour Firewall: 76 0 2 274844
10-min DoS attck: 0 0 0 6
1-hour DoS attck: 0 0 0 42
10-min Interface: 0 0 0 204
1-hour Interface: 88 0 0 318225
Command Purpose
show threat-detection rate
[min-display-rate min_display_rate]
[acl-drop | bad-packet-drop |
conn-limit-drop | dos-drop | fw-drop |
icmp-drop | inspect-drop | interface-drop |
scanning-threat | syn-attack]
Displays basic threat detection statistics.
where the min-display-rate min_display_rate argument limits the
display to statistics that exceed the minimum display rate in events per
second. You can set the min_display_rate between 0 and 2147483647.
For a description of each event type, see the “Information About Basic
Threat Detection Statistics” section on page 56-2 .
The output shows the average rate in events/sec over two fixed time
periods: the last 10 minutes and the last 1 hour. It also shows: the current
burst rate in events/sec over the last completed burst interval, which is
1/30th of the average rate interval or 10 seconds, whichever is larger; the
number of times the rates were exceeded (triggered); and the total number
of events over the time periods.
The ASA stores the count at the end of each burst period, for a total of 30
completed burst intervals. The unfinished burst interval presently
occurring is not included in the average rate. For example, if the average
rate interval is 20 minutes, then the burst interval is 20 seconds. If the last
burst interval was from 3:00:00 to 3:00:20, and you use the show
command at 3:00:25, then the last 5 seconds are not included in the
output.
The only exception to this rule is if the number of events in the unfinished
burst interval already exceeds the number of events in the oldest burst
interval (#1 of 30) when calculating the total events. In that case, the ASA
calculates the total events as the last 29 complete intervals, plus the events
so far in the unfinished burst interval. This exception lets you monitor a
large increase in events in real time.
clear threat-detection rate Clears basic threat statistics.