Configuration Guide for Cisco Optical Site Manager, IOS XR Release 26.x.x

Configure RMON thresholds

Updated: October 14, 2026

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Use this procedure to configure RMON thresholds. This task helps you complete the required configuration, verification, or management action in Cisco Optical Site Manager.

RMON thresholds establish monitoring parameters that alert network operators to abnormal conditions. These parameters help detect and resolve network issues early. As a result, network performance and reliability are maintained at optimal levels.

RMON thresholds define specific limits on network performance variables monitored by devices. These thresholds specify conditions that trigger alarms or events when network statistics exceed or fall below set values, enabling continuous observation of Ethernet ports or interfaces.

Before you begin

Follow these steps to provision the RMON thresholds on the control card.

Procedure

Click Provisioning, then click RMON Thresholds.
Click the + button.

The Create RMON Threshold dialog box appears.
Specify the parameters in the Create RMON Threshold dialog box.

For more details about the parameters, refer to Table 1.
Click Apply.

Once RMON thresholds are configured, the system tracks the selected variables against the defined rising and falling limits during sampling intervals. Alarms activate when values surpass rising thresholds. They clear when values drop below falling thresholds. This process enables the system to trigger events repeatedly when thresholds are crossed.

Table 1. RMON threshold parameters
Parameter	Description
Port ID	The identifier for the port that you configure the RMON threshold for.
Variable	The specific MIB variable to be sampled. This variable must be any of these ASN.1 primitive type: INTEGER\ Counter32 Counter64 Gauge TimeTicks
Alarm Type	Indicates which threshold crossing triggers the alarm: Rising Falling Rising or Falling
Sampling Type	The method used to sample the variable: Absolute: the threshold to use the total number of occurrences, regardless of the time period Relative: restricts the threshold to use the number of occurrences within the user-set sample period.
Sampling Period	The interval in seconds over which the data is sampled and compared against the thresholds.
Rising Threshold	The threshold value that triggers a rising alarm event when the sampled statistic rises to or above it. Note For a rising type of alarm, the measured value must move from below the falling threshold to above the rising threshold. For example, if a network is running below a rising threshold of 1,000 collisions every 15 seconds and a problem causes 1,001 collisions in 15 seconds, the excess occurrences trigger an alarm.
Falling Threshold	The threshold value that triggers a falling alarm event when the sampled statistic falls to or below it.

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