CISCO-DOT11-RADAR-MIB

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Organization: Cisco System Inc.

Last Updated: 2007-05-07

Category: Cisco Devices, Wireless and WLAN

Description: Manages DFS radar detection on Cisco 802.11a/n access points, monitoring radar events and channel change activity.

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What Is CISCO-DOT11-RADAR-MIB?

CISCO-DOT11-RADAR-MIB is a Cisco wireless-networking MIB covering Dynamic Frequency Selection (DFS) radar detection on IEEE 802.11a/h/n root devices, i.e. access points and root bridges operating in radar-regulated spectrum. It exposes configuration data (preferred and new operating frequencies) and event/fault data around radar detection, specifically channel-switch and channel-return events and their timestamps. Its primary monitoring value is fault and event tracking rather than continuous performance counters: it lets an operator confirm when and why an AP vacated a channel due to detected radar and when it returned, which is critical for diagnosing unexpected wireless outages or channel instability in regulatory-sensitive deployments. It builds on the IEEE 802.11 standard's DFS requirements and is used alongside other Cisco wireless (dot11) MIBs. It is deployed in enterprise and outdoor Cisco Wi-Fi networks operating in the 5GHz band where radar avoidance is mandated by regulators. Engineers can download the CISCO-DOT11-RADAR-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-DOT11-RADAR-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco 802.11a/n/h access points
Cisco wireless root bridges

Monitoring Examples

An administrator can monitor cdrDot11NewFrequency and cdrDot11PreferFrequency to see which channel an AP moved to and which channel it prefers to return to after a radar event. cdrChannelSwitchLastTime and cdrChannelReturnLastTime give timestamps for the most recent forced channel switch and subsequent return, letting an admin correlate a reported wireless outage with a radar detection event rather than a hardware failure. Enabling cdrChannelSwitchNotifEnabled and cdrChannelReturnNotifEnabled ensures SNMP traps fire for these events so they can be tracked proactively instead of only via polling.

What Can Be Monitored

current/new operating frequency after radar event
preferred return frequency
last channel switch time
last channel return time
channel switch/return notification status

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks
Unsigned32

From SNMPv2-TC

TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoDot11RadarMIB	1.3.6.1.4.1.9.9.627			This MIB module is for IEEE 802.11a/h Root device, i.e. Access Point (AP) or Root Bridge. This MIB allows dynamic frequency selection features related to DOT11 device. ACRONYMS AP Access point RADAR RAdio Detection And Range GLOSSARY Access point Transmitter/receiver (transceiver) device that commonly connects and transports data between a wireless network and a wired network. Non-Root Bridge This wireless bridge does not connect to the main wired LAN segment. It connects to a remote wired LAN segment and can associate with root bridges and other non-root bridges that accept client associations. It also can accept associations from other non-root bridges, repeater access points, and client devices. Radar Radar is a system that uses electromagnetic waves to identify the range, altitude, direction, or speed of both moving and fixed objects such as aircraft, ships, motor vehicles, weather formations, and terrain. Repeater or Non-root Access Point The repeater access point is not connected to the wired LAN. The Repeater is a wireless LAN transceiver that transfers data between a client and another access point, another repeater, or between two bridges. The repeater is placed within radio range of an access point connected to the wired LAN, another repeater, or an non-root bridge to extend the range of the infrastructure. Root (Wireless) Bridge This wireless bridge connects to the main wired LAN. It can communicate with non-root wireless bridges, repeater access points, and client devices but not with another wireless root bridge. Only one wireless bridge in a wireless LAN can be set as the wireless root bridge. Work-group Bridge It is a client to APs or wireless root bridges. The radio port of a WGB serves as the uplink to the main network and the Ethernet port provides network access for devices like PC or IP phone.
ciscoDot11RadarMIBNotifs	1.3.6.1.4.1.9.9.627.0
NTF ciscoDot11RadarChannelSwitch	1.3.6.1.4.1.9.9.627.0.1			This notification will be sent when a radar is detected either by AP itself or by a report from a client indicating that it has detected radar. The cdrDot11NewFrequency specify the channel that AP has switched to. This notification can be enabled or disabled via the cdrChannelSwitchNotifEnabled object.
NTF ciscoDot11RadarChannelReturn	1.3.6.1.4.1.9.9.627.0.2			This notification will be sent when a AP has returned to the prefer channel. The cdrDot11PreferFrequency specify the channel that AP returns to. This notification can be enabled disabled via the cdrChannelReturnNotifEnabled object.
ciscoDot11RadarMIBObjects	1.3.6.1.4.1.9.9.627.1
cdrDot11RadarNotifConfig	1.3.6.1.4.1.9.9.627.1.1
T/F cdrChannelSwitchNotifEnabled	1.3.6.1.4.1.9.9.627.1.1.1	TruthValue	read-write	Indicates whether the ciscoDot11RadarChannelSwitch notification will or will not be sent by the agent when a radar is detected. If it is 'true', the notification will be sent. If it is 'false', the notification will not be sent.
T/F cdrChannelReturnNotifEnabled	1.3.6.1.4.1.9.9.627.1.1.2	TruthValue	read-write	Indicates whether the ciscoDot11RadarChannelReturn notification will or will not be sent by the agent when AP moves back to the prefer channel. If it is 'true', the notification will be sent. If it is 'false', the notification will not be sent.
cdrDot11RadarDetectInfo	1.3.6.1.4.1.9.9.627.1.2
U32 cdrDot11NewFrequency	1.3.6.1.4.1.9.9.627.1.2.1	Unsigned32	read-only	This is the IEEE 802.11a/h channel frequency that specify the new channel that the AP has switched to after (1) it has detected radar, or (2) received report from a client indicating that it has detected radar. The value of zero indicates that dynamic frequency selection has not completed after reset.
U32 cdrDot11PreferFrequency	1.3.6.1.4.1.9.9.627.1.2.2	Unsigned32	read-only	This is the IEEE 802.11a/h channel frequency that specify the prefer channel that the AP has moved back to. The value of zero indicates that prefer frequency is not selected.
TIK cdrChannelSwitchLastTime	1.3.6.1.4.1.9.9.627.1.2.3	TimeTicks	read-only	The value of sysUpTime when cdrDot11NewFrequency was last changed.
TIK cdrChannelReturnLastTime	1.3.6.1.4.1.9.9.627.1.2.4	TimeTicks	read-only	The value of sysUpTime when cdrDot11PreferFrequency was last changed.
ciscoDot11RadarMIBConform	1.3.6.1.4.1.9.9.627.2
ciscoDot11RadarMIBCompliances	1.3.6.1.4.1.9.9.627.2.1
ciscoDot11RadarCompliance	1.3.6.1.4.1.9.9.627.2.1.1			The compliance statement for entities implementing the CISCO-DOT11-RADAR-MIB.
ciscoDot11RadarMIBGroups	1.3.6.1.4.1.9.9.627.2.2
cdrDot11RadarNotifObjectGroup	1.3.6.1.4.1.9.9.627.2.2.1			This group is for enabling/disabling notifications of changing frequency.
ciscoDot11RadarDetectInfoGroup	1.3.6.1.4.1.9.9.627.2.2.2			This group provides frequency-change information from the operation of the Radar detection.
ciscoDot11RadarNotificationGroup	1.3.6.1.4.1.9.9.627.2.2.3			This group provides notifications related to Radar Channel.

RFC description

Manages dynamic frequency selection (DFS) and radar detection features for IEEE 802.11a/h wireless access points and bridges.

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Download CISCO-DOT11-RADAR-MIB

What Is CISCO-DOT11-RADAR-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description