336 RackSwitch G8000: Application Guide
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
1.3.6.1.2.1.2.2.1.10.
x
– ifInOctets
The last digit (
x
) represents the interface on which to monitor, which corresponds to
the interface number, or port number, as follows:
1-128 = IF 1-128
129 = port 1
130 = port 2
…
172 = port 44
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
Example 1
Configure the RMON Alarm parameters to track the number of packets received on
port 1.
This configuration creates an RMON alarm that checks
ifInOctets
on port 1 once
every hour. If the statistic exceeds two billion, an alarm is generated that triggers
event index 100.
RS G8000(config)# rmon alarm <alarm number> rising-crossing-index
<event number>
RS G8000(config)# rmon alarm <alarm number> falling-crossing-index
<event number>
RS G8000(config)# rmon alarm 1 oid 1.3.6.1.2.1.2.2.1.10.129
RS G8000(config)# rmon alarm 1 alarm-type rising
RS G8000(config)# rmon alarm 1 rising-crossing-index 100
RS G8000(config)# rmon alarm 1 interval 3600
RS G8000(config)# rmon alarm 1 rising-limit 2000000000
RS G8000(config)# rmon alarm 1 owner "Alarm for ifInOctets"
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