RMON Configuration Guide, Cisco IOS XE Release 3SE (3850)
Bias-Free Language
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
- Updated:
- July 14, 2017
Chapter: RMON-MIB Support for 64-Bit Counters
- Finding Feature Information
- Information About RMON-MIB Support for 64-Bit Counters
- How to Configure RMON-MIB Support for 64-Bit Counters
- Configuration Examples for RMON-MIB Support for 64-Bit Counters
- Additional References for RMON-MIB Support for 64-Bit Counters
- Feature Information for RMON-MIB Support for 64-Bit Counters
RMON-MIB Support for 64-Bit Counters
This module describes the RMON MIB (RMON-MIB) enhancement to monitor 64-bit MIB objects. The High Capacity (HC) Alarm MIB (HC-ALARM-MIB) is part of this enhancement and provides the capability to create alarms that monitor thresholds that are crossed by 64-bit MIB objects on an access server.
- Finding Feature Information
- Information About RMON-MIB Support for 64-Bit Counters
- How to Configure RMON-MIB Support for 64-Bit Counters
- Configuration Examples for RMON-MIB Support for 64-Bit Counters
- Additional References for RMON-MIB Support for 64-Bit Counters
- Feature Information for RMON-MIB Support for 64-Bit Counters
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Information About RMON-MIB Support for 64-Bit Counters
HC Alarm MIB
The High Capacity (HC) Alarm MIB (HC-ALARM-MIB) provides the capability to create alarms that monitor thresholds crossed by 64-bit MIB objects on an access server. The Remote Monitoring (RMON)-1 Alarm group and RMON-1 notification types are specific to 32-bit objects. The HC alarm MIB supports the polling of 64-bit RMON objects and is an extension of the RMON-1 Alarm group.
The RMON-1 Events group controls the generation and notification of events from a device. When an event is created, it is added to the RMON-1 Events group table. Each entry in this table describes parameters of an event that can be triggered by alarms. An entry may specify that a log entry must be created whenever an event occurs. The entry may also specify that a notification should occur through Simple Network Management Protocol (SNMP) trap messages.
The HC Alarm MIB defines two SNMP traps: hcRisingAlarm and hcFallingAlarm. The hcRisingAlarm trap is used when a rising-threshold value is crossed, and the hcFallingAlarm trap is used when a falling-threshold value is crossed.
High Capacity (HC) alarms are triggered when a monitored variable exceeds a set rising-threshold value or falls below a set falling-threshold value. HC alarms can be set on any HC MIB object on an access server.
Given below is a typical flow of how a 64-bit RMON object is monitored:
- A user creates an event. The user defines the actions to be executed when an event occurs: creation of a log entry or notification by SNMP trap messages. The event is added to the RMON-1 Events group table.
- A user creates an HC alarm. The user defines the MIB object that needs to be monitored by the alarm, the interval for monitoring, the rising-threshold value, and the falling-threshold value. The user also defines the events that are triggered when a rising-threshold value or falling-threshold value is crossed. The HC alarm is added to the HC alarm table.
- The HC alarm monitors the MIB object according to the defined interval. If the counter value crosses the respective thresholds, the HC alarm is triggered.
- When an HC alarm is triggered, the defined events are also triggered.
- When an event is triggered, the actions defined in the events are executed. Either a log entry is created or an SNMP trap is generated.
HC Alarm Group
Remote Monitoring (RMON) delivers information in RMON groups, which include elements that can be monitored by alarms. Each RMON group provides specific sets of data that meet common network monitoring requirements.
The table below summarizes the three High Capacity (HC) RMON monitoring groups, as specified in RFC 3434.
| HC RMON Group | Function | Elements |
|---|---|---|
| High Capacity Alarm Control Group |
Controls the configuration of alarms for high capacity MIB object instances. |
Includes the HC alarm table and requires the implementation of the RMON-1 Events group. The HC alarm table includes the alarm type, alarm interval, start threshold, and stop threshold. |
| High Capacity Alarm Capabilities |
Describes high capacity alarm capabilities. |
Includes a single scalar object that describes the supported HC alarm features. |
| High Capacity Alarm Notifications |
Provides rising and falling threshold notifications for high capacity objects. |
Includes two notifications, hcRisingAlarm and hcFallingAlarm. These are generated for high capacity alarms. |
How to Configure RMON-MIB Support for 64-Bit Counters
Monitoring a 64-bit MIB Object
Perform this task to configure a High Capacity (HC) alarm to monitor a 64-bit MIB object on an access server.
DETAILED STEPS
Configuration Examples for RMON-MIB Support for 64-Bit Counters
Example: Monitoring a 64-Bit MIB Object
You can create a High Capacity (HC) alarm to monitor a 64-bit MIB object. You can create a Remote Monitoring (RMON) event that is triggered by the HC alarm when defined thresholds are crossed.
The following example shows how to create an RMON event:
Device> enable Device# configure terminal Device(config)# rmon event 1 log trap eventtrap description "High ifOutErrors" owner ownerA
In this example, RMON event number 1 is created. The name of the event is defined as High ifOutErrors. A log entry is generated when the event is triggered by an alarm. Additionally, a row is created in the RMON-1 Events group table for user ownerA. A Simple Network Management Protocol (SNMP) trap is also generated when the event is triggered.
The following is sample output from the show rmon events command:
Device# show rmon events
Event 1 is active, owned by ownerA
Description is High ifOutErrors
Event firing causes log and trap to community rmonTrap, last fired 00:00:00
The following example shows how to configure an RMON HC alarm:
Device> enable Device# configure terminal Device(config)# rmon hc-alarms 2 ifInOctets.2 20 delta rising-threshold 2000 1 falling-threshold 1000 1 owner ownerA
In this example, RMON HC alarm number 2 is created. The alarm monitors the MIB variable ifInOctets.2 once every 20 seconds until the alarm is disabled and checks the change in the rise or fall of the variable. If the value of the ifInOctets.2 variable shows a MIB counter increase of 2000 or more, such as from 100000 to 103000, the alarm is triggered. The alarm, in turn, triggers RMON event number 1, which was configured using the rmon event command. Possible events include a log entry or an SNMP trap. If the value of the ifInOctets.2 variable shows a MIB counter decrease of 1000 or more (when falling threshold is 1000), the alarm is reset.
The following is sample output from the show rmon hc-alarms command that displays contents of the RMON HC alarm table of the device:
Device# show rmon hc-alarms
Monitors ifInOctets.2 every 20 second(s)
Taking absolute samples, last value was 0
Rising threshold Low is 4096, Rising threshold Hi is 0,
assigned to event 1
Falling threshold Low is 1280, Falling threshold Hi is 0,
assigned to event 0
On startup enable rising or falling alarm
Additional References for RMON-MIB Support for 64-Bit Counters
Related Documents
| Related Topic |
Document Title |
|---|---|
| Cisco IOS commands |
|
| RMON commands |
MIBs
| MIB |
MIBs Link |
|---|---|
| HC-ALARM-MIB |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFCs
| RFC |
Title |
|---|---|
| RFC 3434 |
Remote Monitoring MIB Extensions for High Capacity Alarms |
Technical Assistance
| Description |
Link |
|---|---|
| The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for RMON-MIB Support for 64-Bit Counters
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
| Table 1 | Feature Information for RMON-MIB Support for 64-Bit Counters |
| Feature Name |
Releases |
Feature Information |
|---|---|---|
| RMON-MIB Support for 64-Bit Counters |
12.2(33)SRE 12.2(33)SXI |
The RMON-MIB Support for 64-Bit Counters feature provides the ability to poll 64-bit counter objects. The HC Alarm MIB provides an extension to the RMON-1 Alarm group table objects. The HC Alarm MIB provides the capability to create alarms that monitor thresholds crossed by 64-bit MIB objects on the access server, a capability supported by the RMON MIB for 32-bit MIB objects only. The following commands were introduced: rmon hc-alarms, show rmon hc-alarms. |
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.
Feedback