CISCO-DOT11-ANTENNA-MIB

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Organization: Cisco System Inc.

Last Updated: 2016-02-15

Category: Cisco Devices, Wireless and WLAN

Description: Manages 802.11 antenna configuration on Cisco wireless access points, including antenna type, gain, and diversity settings.

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What Is CISCO-DOT11-ANTENNA-MIB?

CISCO-DOT11-ANTENNA-MIB manages 802.11 antenna configuration on Cisco wireless access points and wireless bridges, providing the NMS with information about connected antennas so it can calculate recommended radio settings for optimal coverage and throughput. The data it exposes is primarily hardware configuration: whether antenna gain has been explicitly configured and the resultant gain value used in RF planning calculations. As a hardware-configuration MIB it lets an administrator verify the correct antenna type and gain are recognized by the access point, since an incorrect or unconfigured gain value can lead to poor coverage planning or regulatory transmit-power violations. It is a Cisco proprietary extension built for Cisco's wireless (Aironet/wireless LAN) product line and works alongside the broader 802.11 MIB objects for radio configuration. It is typically deployed on enterprise Cisco wireless access points and bridges where external or high-gain antennas are attached and coverage/throughput planning is important. Engineers can download the CISCO-DOT11-ANTENNA-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-DOT11-ANTENNA-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 Aironet wireless access point or wireless bridge

Monitoring Examples

An administrator walks cDot11AntennaTable / cDot11AntennaEntry per radio interface, checking cDot11AntennaIsGainConfigured to see whether the AP has an explicit gain value versus a default assumption. Reading cDot11AntennaResultantGain reveals the effective gain the AP is using for its RF calculations, and a mismatch against the physically installed antenna's rated gain would produce inaccurate coverage predictions or transmit-power settings out of regulatory compliance. This check is typically done after installing a new high-gain external antenna to confirm the AP's configuration matches the deployed hardware.

What Can Be Monitored

antenna gain configuration status
resultant antenna gain value

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoDot11AntennaMIB	1.3.6.1.4.1.9.9.384			This MIB is intended to be implemented on 802.11 Access Points and Wireless Bridges to provide information about the antennas connected to their 802.11 interfaces. The NMS retrieves the configured antenna parameters and uses it to calculate the recommended radio settings to be applied to the Access Points being managed to achieve optimum coverage and throughput. GLOSSARY Access Point ( AP ) An entity that contains an 802.11 medium access control ( MAC ) and physical layer ( PHY ) interface and provides access to the distribution services via the wireless medium for associated clients. Wireless Bridge An 802.11 entity that provides wireless connectivity between two wired LAN segments and is used in point- to-point or point-multipoint configurations. Repeater-AP A repeater is a 'wireless AP' that is attached to a parent AP on an 802.11 primary port. The Ethernet port is disabled in a Repeater-AP. Antenna A passive device connected to the 802.11 interface that is used for transmission and reception of the radio signals. Antennas transmit radio signals in all directions (omnidirectional) or in a particular direction(directional, high-gain). Antenna Gain The Antenna Gain is the measure of the amount of amplification done on the input radio signal by the antenna. Amplification is done by virtue of focussing the RF radiation into a tighter beam. Antenna Gain is expressed as dBi units. Attenuator An attenuator circuit allows a known source of power to be reduced by a predetermined factor usually expressed as decibels. This power reduction is achieved by the attenuator without introducing distortion. An attenuator may be used in either audio or radio signal circuits.
cDot11AntennaMIBObjects	1.3.6.1.4.1.9.9.384.1
cDot11AntennaGlobal	1.3.6.1.4.1.9.9.384.1.1
cDot11AntennaTable	1.3.6.1.4.1.9.9.384.1.1.1		not-accessible	This table holds the specification of the antenna connected to the 802.11 interfaces of an infrastructure device like an AP or Bridge. The table gets populated when the administrator configures the 802.11 interface with information about the antenna connected to it. This table has a sparse dependent relationship with ifTable defined in IF-MIB. There exists an entry in this table corresponding to the entry for each dot11 interface found in ifTable. This table is not applicable to virtual dot11 interfaces.
cDot11AntennaEntry	1.3.6.1.4.1.9.9.384.1.1.1.1		not-accessible	An entry corresponds to the set of operational parameters of the antenna connected to the 802.11 interface identified by ifIndex.
T/F cDot11AntennaIsGainConfigured	1.3.6.1.4.1.9.9.384.1.1.1.1.1	TruthValue	read-only	This flag indicates whether the 802.11 interface is connected to an external antenna and/or the attenuator and configured with the resultant gain or not. If the interface has an external antenna and/or an attenuator connected to it and has been configured with the resultant gain, the value of this object is 'true'. This object, when 'false', indicates that both the external antenna and the attenuator are physically disconnected from the 802.11 interface. Also, the query to the object cDot11AntennaResultantGain returns the default gain corresponding to the PHY type of that 802.11 interface when this object's value is 'false'.
I32 cDot11AntennaResultantGain	1.3.6.1.4.1.9.9.384.1.1.1.1.2	Integer32	read-only	This object, expressed in dB, is used to calculate the appropriate radio settings for the wireless infrastructure devices being managed. The semantics are as follows. For a dot11 interface without an external antenna and an attenuator connected to it, the value of this object is the default gain corresponding to the PHY type of that respective interface. If the particular dot11 interface is connected to an external antenna in the presence of an attenuator, this object holds the value that is the resultant of the gain of the antenna as specified by the antenna's hardware specification and the attenuation introduced by the attenuator, as configured by the administrator. In the absence of an attenuator, the value held by this object is the exact value of the gain of the external antenna configured by the administrator as specified by the antenna's hardware specification, if an external antenna is connected to the 802.11 interface. In the absence of an external antenna, if the attenuator is present, the value of this object is is the amount of attenuation that is intended to be introduced to control the output power, as configured by the administrator. The value of this object is reverted back by the agent to the default gain corresponding to the PHY type of the particular 802.11 interface, when both the external antenna and the attenuator are physically disconnected from the particular interface and the gain configured earlier is cleared by the administrator.
cDot11AntennaMIBConform	1.3.6.1.4.1.9.9.384.2
cDot11AntennaMIBCompliances	1.3.6.1.4.1.9.9.384.2.1
cDot11AntennaMIBCompliance	1.3.6.1.4.1.9.9.384.2.1.1			The compliance statement for the SNMP entities that implement the ciscoDot11AntennaMIB module.
cDot11AntennaMIBGroups	1.3.6.1.4.1.9.9.384.2.2
cDot11AntennaGlobalGroup	1.3.6.1.4.1.9.9.384.2.2.1			This collection of objects provide information about the antenna connected to the 802.11 interfaces of a WLAN infrastructure device like an Access Point or a Bridge.

RFC description

Cisco 802.11 wireless antenna information MIB; provides antenna parameters and configuration for access points and wireless bridges to optimize coverage.

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Download CISCO-DOT11-ANTENNA-MIB

What Is CISCO-DOT11-ANTENNA-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description