The RMON option identifies activity on individual nodes and allows you to monitor all nodes and their interaction on a LAN
segment. Used in conjunction with the SNMP agent in a device, Combining RMON alarms and events (classes of messages that indicate
traffic violations and various unusual occurrences over a network) with existing MIBs allows you to choose where proactive
monitoring will occur.
![](https://www.cisco.com/content/dam/en/us/td/i/templates/note.gif) Note |
RMON requires that SNMP be configured (you must be running a version of SNMP on the server that contains the RMON MIB). A
generic RMON console application is recommended in order to take advantage of the RMON network management capabilities.
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RMON can be very data- and processor-intensive. Users should measure usage effects to ensure that the device performance
is not degraded by RMON and to minimize excessive management traffic overhead. Native mode in RMON is less intensive than
promiscuous mode.
All Cisco IOS XE software images ordered without the explicit RMON option include limited RMON support (RMON alarms and event
groups only). Images ordered with the RMON option include support for all nine management groups (statistics, history, alarms,
hosts, hostTopN, matrix, filter, capture, and event). As a security precaution, support for the capture group allows capture
of packet header information only; data payloads are not captured.
RMON MIB features include the following:
-
usrHistory group. This MIB group is similar to the RMON etherHistory group except that the group enables the user to specify
the MIB objects that are collected at each interval.
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partial probeConfig group. This MIB group is a subset of the probeConfig group implemented in read-only mode. These objects
implement the simple scalars from this group. The table below details new partial probeConfig group objects.
Table 1. partial probeConfig Group Objects
Object
|
Description
|
probeCapabilities
|
The RMON software groups implemented.
|
probeSoftwareRev
|
The current version of Cisco IOS XE running on the device.
|
probeHardwareRev
|
The current version of the Cisco device.
|
probeDateTime
|
The current date and time.
|
probeResetControl
|
Initiates a reset.
|
probeDownloadFile
|
The source of the image running on the device.
|
probeDownloadTFTPServer
|
The address of the server that contains the Trivial File Transfer Protocol (TFTP) file that is used by the device to download
new versions of Cisco IOS XE software.
|
probeDownloadAction
|
Specifies the action of the commands that cause the device to reboot.
|
probeDownloadStatus
|
The state of a reboot.
|
netDefaultGateway
|
The router mapped to another Cisco device as the default gateway.
|
hcRMONCapabilities
|
Specifies the features mapped to this version of RMON.
|