Filter
Top Products
BLADEOS 6.5.2 Application Guide
BMD00220, October 2010 Chapter 27: Remote Monitoring 373
RMON Group 3—Alarms
The RMON Alarm Group allows you to define a set of thresholds used to determine network
performance. When a configured threshold is crossed, an alarm is generated. For example, you can
configure the switch to issue an alarm if more than 1,000 CRC errors occur during a 10-minute time
interval.
Each Alarm index consists of a variable to monitor, a sampling time interval, and parameters for
rising and falling thresholds. The Alarm Group can be used to track rising or falling values for a
MIB object. The object must be a counter, gauge, integer, or time interval.
Use one of the following commands to correlate an Alarm index to an Event index:
When the alarm threshold is reached, the corresponding event is triggered.
Alarm MIB objects
The most common data types used for alarm monitoring are ifStats: errors, drops, bad CRCs,
and so on. These MIB Object Identifiers (OIDs) correlate to the ones tracked by the History Group.
An example statistic follows:
1.3.6.1.2.1.5.1.0 – mgmt.icmp.icmpInMsgs
This value represents the alarm’s MIB OID, as a string. Note that for non-tables, you must supply a
.0 to specify end node.
Configuring RMON Alarms
Configure the RMON Alarm parameters to track ICMP messages.
This configuration creates an RMON alarm that checks icmpInEchos on the switch once every
minute. If the statistic exceeds 200 within a 60 second interval, an alarm is generated that triggers
event index 110.
RS G8124(config)# rmon alarm <alarm number> rising-crossing-index
<event number>
RS G8124(config)# rmon alarm <alarm number> falling-crossing-index
<event number>
RS G8124(config)# rmon alarm 1 oid 1.3.6.1.2.1.5.8.0
RS G8124(config)# rmon alarm 1 alarm-type rising
RS G8124(config)# rmon alarm 1 rising-crossing-index 110
RS G8124(config)# rmon alarm 1 interval-time 60
RS G8124(config)# rmon alarm 1 rising-limit 200
RS G8124(config)# rmon alarm 1 sample delta
RS G8124(config)# rmon alarm 1 owner "Alarm for icmpInEchos"