Rmon Group 3-Alarms; Alarm Mib Objects; Configuring Rmon Alarms; Alarm Example 1 - Lenovo CN4093 Application Manual

RMON Group 3–Alarms

Alarm MIB Objects

Configuring RMON Alarms

Alarm Example 1

© Copyright Lenovo 2015
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:
CN 4093(config)# rmon alarm <alarm number> rising-crossing-index <event number>
CN 4093(config)# rmon alarm <alarm number> falling-crossing-index
<event number>
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 of an ICMP stat is as follows:
1.3.6.1.2.1.5.1.<x> - mgmt.icmp.icmpInMsgs
where x represents the interface on which to monitor, which corresponds to the
switch interface number or port number, as follows:
 1 through 128 = Switch interface number
129 = Switch port 1

 130 = Switch port 2
131 = Switch port 3, and so on.

This value represents the alarm's MIB OID, as a string. Note that for non-tables,
you must supply a .0 to specify an end node.
This example configuration creates an RMON alarm that checks ifInOctets on
port 20 once every hour. If the statistic exceeds two billion, an alarm is generated
that triggers event index 6.
Configure the RMON Alarm parameters to track the number of packets received
on a port.
CN 4093(config)# rmon alarm 1 oid 1.3.6.1.2.1.2.2.1.10.129
CN 4093(config)# rmon alarm 1 alarm-type rising
CN 4093(config)# rmon alarm 1 rising-crossing-index 100
CN 4093(config)# rmon alarm 1 interval 3600
CN 4093(config)# rmon alarm 1 rising-limit 2000000000
CN 4093(config)# rmon alarm 1 owner "Alarm for ifInOctets"
Chapter 39: Remote Monitoring
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