HP 3400CL-24G manual Ip-address-count

	Enhancements
	Release M.10.04 Enhancements
Parameter Name	Description
ip-address-count	The number of destination IP addresses learned in the IP forwarding table. Some
	attacks fill the IP forwarding table causing legitimate traffic to be dropped.
system-resource-usage	The percentage of system resources in use. Some Denial-of-Service (DoS) attacks
(Denial of Service logging)	will cause excessive system resource usage, resulting in insufficient resources for
	legitimate traffic.
login-failures/min	The count of failed CLI login attempts or SNMP management authentication failures.
	This indicates an attempt has been made to manage the switch with an invalid login
	or password. Also, it might indicate a network management station has not been
	configured with the correct SNMP authentication parameters for the switch.
port-auth-failures/min	The count of times a client has been unsuccessful logging into the network
system-delay	The response time, in seconds, of the CPU to new network events such as BPDU
	packets or packets for other network protocols. Some DoS attacks can cause the
	CPU to take too long to respond to new network events, which can lead to a
	breakdown of Spanning Tree or other features. A delay of several seconds indicates
	a problem.
mac-address-count	The number of MAC addresses learned in the forwarding table. Some attacks fill the
	forwarding table so that new conversations are flooded to all parts of the network.
mac-moves/min	The average number of MAC address moves from one port to another per minute.
	This usually indicates a network loop, but can also be caused by DoS attacks.
learn-discards/min	Number of MAC address learn events per minute discarded to help free CPU
	resources when busy.

Operating Notes

■To generate alerts for monitored events, you must enable the instrumentation monitoring log and/or SNMP trap. The threshold for each monitored parameter is configurable and can be adjusted to minimize false alarms (see “Configuring Instrumentation Monitor” on page 73).

■When a parameter exceeds its threshold, an alert (event log message and/or SNMP trap) is generated to inform network administrators of this condition. The following example shows an event log message that occurs when the number of MAC addresses learned in the forwarding table exceeds the configured threshold:

Standard Date/Time Prefix	“inst-mon” label indicates an	Monitored	Threshold	Current
for Event Log Messages	Instrumentation Monitor event	Parameter	Value	Value

W 05/27/06 12:10:16 inst-mon: Limit for MAC addr count (300) is exceeded (321)

Figure 16. Example of Event Log Message generated by Instrumentation Monitor

71