CISCO-LWAPP-LINKTEST-MIB
AI MIB Summary
The CISCO-LWAPP-LINKTEST-MIB enables Cisco Central Controllers to monitor radio link quality metrics, specifically RSSI and SNR, between Lightweight Access Points and associated Mobile Nodes. It facilitates bidirectional link testing for Cisco Compatible Extensions (CCX) clients and falls back to unidirectional ping-based uplink measurements for non-CCX clients to assess wireless path integrity.
This MIB is intended to be implemented on all those devices operating as Central controllers, that terminate the Light Weight Access Point Protocol tunnel from Cisco Light-weight LWAPP Access Points.
Link Test is performed to learn the radio link quality between AP and Client. CCX linktest is performed for CCX clients. With CCX linktest radio link can be measured in both direction i.e. AP->Client(downLink) and Client->AP(uplink). When client does not support CCX or CCX linktest fails,ping is done between AP and Client. In ping test, only uplink (client->AP) quality can be measured.
The relationship between the controller and the LWAPP APs is depicted as follows.
+......+ +......+ +......+ +......+
+ + + + + + + +
+ CC + + CC + + CC + + CC +
+ + + + + + + +
+......+ +......+ +......+ +......+
.. . . . .. . . . . . . . . . . . . . . . . . . . . . . .
+......+ +......+ +......+ +......+ +......+
+ + + + + + + + + +
+ AP + + AP + + AP + + AP + + AP +
+ + + + + + + + + +
+......+ +......+ +......+ +......+ +......+
. . . . . . . . . . . . . . . . . . . . . . . .
+......+ +......+ +......+ +......+ +......+
+ + + + + + + + + +
+ MN + + MN + + MN + + MN + + MN +
+ + + + + + + + + +
+......+ +......+ +......+ +......+ +......+
The LWAPP tunnel exists between the controller and the APs. The MNs communicate with the APs through the protocol defined by the 802.11 standard.
LWAPP APs, upon bootup, discover and join one of the controllers and forward all the 802.11 frames to them encapsulated inside LWAPP frames.
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.
LWAPP APs encapsulate all the 802.11 frames in LWAPP frames and sends them to the controller to which it is logically connected.
Central Controller ( CC )
The central entity that terminates the LWAPP protocol tunnel from the LWAPP APs. Throughout this MIB, this entity also referred to as 'controller'.
Cisco Compatible eXtensions (CCX)
Wireless LAN Access Points (APs) manufactured by Cisco Systems have features and capabilities beyond those in related standards (e.g., IEEE 802.11 suite of standards, Wi-Fi recommendations by WECA, 802.1X security suite, etc). A number of features provide higher performance. For example, Cisco AP transmits a specific Information Element, which the clients adapt to for enhanced performance. Similarly, a number of features are implemented by means of proprietary Information Elements, which Cisco clients use in specific ways to carry out tasks above and beyond the standard.Other examples of feature categories are roaming and power saving.
Light Weight Access Point Protocol ( LWAPP )
This is a generic protocol that defines the communication between the Access Points and the Central controller.
Mobile Node ( MN )
A roaming 802.11 wireless device in a wireless network associated with an access point. Mobile Node and client are used interchangeably.
Received Signal Strength Indicator ( RSSI )
A measure of the strength of the signal as observed by the entity that received it, expressed in 'dbm'.
Signal-Noise Ratio ( SNR )
A measure of the quality of the signal relative to the strength of noise expressed in 'dB'.
REFERENCE
[1] Wireless LAN Medium Access Control ( MAC ) and Physical Layer ( PHY ) Specifications.
[2] Draft-obara-capwap-lwapp-00.txt, IETF Light Weight Access Point Protocol
Main OID:
ciscoLwappLinkTestMIB.1.3.6.1.4.1.9.9.516
50
Objects
Active
Status
4
Dependencies
Imported Objects
Objects
50 total| Object Name |
|---|
ciscoLwappLinkTestMIBThis MIB is intended to be implemented on all those
devices operating as Central controllers, that
terminate the Light Weight Access Point Protocol
tunnel from Cisco Light-weight LWAPP Access Points.
Link Test is performed to learn the radio link quality
between AP and Client. CCX linktest is performed for
CCX clients. With CCX linktest radio link can be
measured in both direction i.e. AP->Client(downLink)
and Client->AP(uplink). When client does not support
CCX or CCX linktest fails,ping is done between AP and
Client. In ping test, only uplink (client->AP) quality
can be measured.
The relationship between the controller and the LWAPP
APs is depicted as follows.
+......+ +......+ +......+ +......+
+ + + + + + + +
+ CC + + CC + + CC + + CC +
+ + + + + + + +
+......+ +......+ +......+ +......+
.. . . .
.. . . .
. . . . .
. . . . .
. . . . .
. . . . .
+......+ +......+ +......+ +......+ +......+
+ + + + + + + + + +
+ AP + + AP + + AP + + AP + + AP +
+ + + + + + + + + +
+......+ +......+ +......+ +......+ +......+
. . . .
. . . . .
. . . . .
. . . . .
. . . . .
+......+ +......+ +......+ +......+ +......+
+ + + + + + + + + +
+ MN + + MN + + MN + + MN + + MN +
+ + + + + + + + + +
+......+ +......+ +......+ +......+ +......+
The LWAPP tunnel exists between the controller and
the APs. The MNs communicate with the APs through
the protocol defined by the 802.11 standard.
LWAPP APs, upon bootup, discover and join one of the
controllers and forward all the 802.11 frames to them
encapsulated inside LWAPP frames.
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.
LWAPP APs encapsulate all the 802.11 frames in
LWAPP frames and sends them to the controller to which
it is logically connected.
Central Controller ( CC )
The central entity that terminates the LWAPP protocol
tunnel from the LWAPP APs. Throughout this MIB,
this entity also referred to as 'controller'.
Cisco Compatible eXtensions (CCX)
Wireless LAN Access Points (APs) manufactured by Cisco
Systems have features and capabilities beyond those in
related standards (e.g., IEEE 802.11 suite of
standards, Wi-Fi recommendations by WECA, 802.1X
security suite, etc). A number of features provide
higher performance. For example, Cisco AP transmits a
specific Information Element, which the clients adapt
to for enhanced performance. Similarly, a number of
features are implemented by means of proprietary
Information Elements, which Cisco clients
use in specific ways to carry out tasks above and
beyond the standard.Other examples of feature
categories are roaming and power saving.
Light Weight Access Point Protocol ( LWAPP )
This is a generic protocol that defines the
communication between the Access Points and the
Central controller.
Mobile Node ( MN )
A roaming 802.11 wireless device in a wireless
network associated with an access point. Mobile Node
and client are used interchangeably.
Received Signal Strength Indicator ( RSSI )
A measure of the strength of the signal as
observed by the entity that received it,
expressed in 'dbm'.
Signal-Noise Ratio ( SNR )
A measure of the quality of the signal relative
to the strength of noise expressed in 'dB'.
REFERENCE
[1] Wireless LAN Medium Access Control ( MAC ) and
Physical Layer ( PHY ) Specifications.
[2] Draft-obara-capwap-lwapp-00.txt, IETF Light
Weight Access Point Protocol MODULE-IDENTITY .1.3.6.1.4.1.9.9.516 |
ciscoLwappLinkTestMIBNotifs OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.516.0 |
ciscoLwappLinkTestMIBObjects OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.516.1 |
ciscoLwappLinkTestConfig OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.516.1.1 |
cLLtResponderThis object is used to control the AP's response
to the linktests initiated by the client.
When set to 'true', the AP is expected to respond
to the linktests performed by the client.
The AP won't respond to the linktests initiated by
the client, when this object is set to 'false'.rw TruthValue (SNMPv2-TC) .1.3.6.1.4.1.9.9.516.1.1.1 |
cLLtPacketSizeThis object indicates the number of bytes to be
sent by the AP to the client in one linktest
packet.rw Unsigned32 .1.3.6.1.4.1.9.9.516.1.1.2 |
cLLtNumberOfPacketsThis object indicates the number of linktest
packets sent by the AP to the client.rw Unsigned32 .1.3.6.1.4.1.9.9.516.1.1.3 |
cLLtTestPurgeTimeThis object indicates the duration for which the
results of a particular run of linktest is available
in cLLtClientLtResultsTable from the time of
completion of that run of linktest. At the expiry of
this time after the completion of the linktest, the
entries corresponding to the linktest and the
corresponding results are removed from
cLLtClientLinkTestTable and cLLtClientLtResultsTable
respectively.rw Unsigned32 .1.3.6.1.4.1.9.9.516.1.1.4 |
ciscoLwappLinkTestRun OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.516.1.2 |
cLLtClientLinkTestTableThis table is used to initiate linktests between
an AP and one of its associated clients. CCX
linktests are done on clients that support CCX. For
all non-CCX clients, ping test is done. Note that
ping test is also done when the CCX linktests fail.
With CCX LinkTest support, the controller can test
the link quality in downstream (direction of
traffic from AP to client) direction by issuing
LinkTest requests towards the client and let client
record in the response packet the RF parameters
like received signal strength, signal-to-noise
etc., of the received request packet.
With ping test only those RF parameters that are
seen by the AP are measured.
User initiates one run of linktest by adding a
row to this table through explicit management
action from the network manager. A row is created
by specifying cLLtClientLtIndex,
cLLtClientLtMacAddress and setting the RowStatus
object to 'createAndGo'. This indicates the
the request made to start the linktest on the
client identified by cLLtClientLtMacAddress.
cLLtClientLtIndex identifies the particular
instance of the test.
The added row is deleted by setting the corresponding
instance of the RowStatus object to 'destroy'. In
case if the agent finds that the time duration
represented by cLLtTestPurgeTime has elapsed since
the completion of the linktest, it proceeds to
delete the row automatically, if the row exists at
that point of time.
The results of the linktest identified by
cLLtClientLtIndex can be obtained from the
queries to cLLtClientLtResultsTable. SEQUENCE OF CLLtClientLinkTestEntry .1.3.6.1.4.1.9.9.516.1.2.1 |
cLLtClientLinkTestEntryEach entry in this table represents one instance
of the linktest initiated by the user through
a network manager. CLLtClientLinkTestEntry .1.3.6.1.4.1.9.9.516.1.2.1.1 |
cLLtClientLtIndexThis object uniquely identifies one particular
run of the linktest initiated between the client
identified by cLLtClientLtMacAddress and the AP it
is currently associated with. Unsigned32 .1.3.6.1.4.1.9.9.516.1.2.1.1.1 |
cLLtClientLtMacAddressThis object represents the mac address of the client
involved in the particular run of linktest. This
object must be set to a valid value when setting
cLLtClientRowStatus to 'createAndGo' to initiate a
run of linktest.rw MacAddress (SNMPv2-TC) .1.3.6.1.4.1.9.9.516.1.2.1.1.2 |
cLLtClientLtRowStatusThis object is the status column used for creating
and deleting instances of the columnar objects in
this table.rw RowStatus (SNMPv2-TC) .1.3.6.1.4.1.9.9.516.1.2.1.1.3 |
cLLtClientLTResultsTableThis table populates the results of the linktests
initiated by the user through the
cLLtClientLinkTestTable.
This table has a sparse dependent relationship
with cLLtClientLinkTestTable. There exists a
row in this table corresponding to the row for
each row in cLLtClientLinkTestTable identified
by cLLtClientLtIndex. A row is added to this
table when user, through the network manager, adds
a row to cLLtClientLinkTestTable and initiates
one run of linktest. A row is deleted by the agent
when the corresponding row of cLLtClientLinkTestTable
is deleted.
The manager is expected to poll cLLtClientLtStatus
to check the status of the linktest. Depending
on the status read through this object
cLLtClientLtStatus, the appropriate columns for
CCX or ping tests are read and linktest statistics
are gathered. SEQUENCE OF CLLtClientLTResultsEntry .1.3.6.1.4.1.9.9.516.1.2.2 |
cLLtClientLTResultsEntryEach entry in this table represents the results
of the linktest identified by
cLLtClientLtIndex. CLLtClientLTResultsEntry .1.3.6.1.4.1.9.9.516.1.2.2.1 |
cLLtClientLtPacketsSentThe number of packets sent to the target client
specified by cLLtClientLtMacAddress by the AP it is
associated to.ro Counter32 UNITS "packets" .1.3.6.1.4.1.9.9.516.1.2.2.1.1 |
cLLtClientLtPacketsRxThe number of packets sent by the client specified
by cLLtClientLtMacAddress to the AP it is associated
to.ro Counter32 UNITS "packets" .1.3.6.1.4.1.9.9.516.1.2.2.1.2 |
cLLtClientLtTotalPacketsLostThe total number of packets lost during the linktest
in both the upstream and downstream directions.ro Counter32 UNITS "packets" .1.3.6.1.4.1.9.9.516.1.2.2.1.3 |
cLLtClientLtApToClientPktsLostThe number of packets lost during the linktest in
the downstream (direction of traffic from AP to
client) direction.ro Counter32 UNITS "packets" .1.3.6.1.4.1.9.9.516.1.2.2.1.4 |
cLLtClientLtClientToApPktsLostThe number of packets lost during the linktest in
the upstream (direction of traffic from client to AP)
direction.ro Counter32 UNITS "packets" .1.3.6.1.4.1.9.9.516.1.2.2.1.5 |
cLLtClientLtMinRoundTripTimeThe minimum round trip time observed on the
linktest packet between the AP and the client.ro TimeInterval UNITS "hundredths-seconds" .1.3.6.1.4.1.9.9.516.1.2.2.1.6 |
cLLtClientLtMaxRoundTripTimeThe maximum round trip time observed on the
linktest packet between the AP and the client.ro TimeInterval UNITS "hundredths-seconds" .1.3.6.1.4.1.9.9.516.1.2.2.1.7 |
cLLtClientLtAvgRoundTripTimeThe average round trip time observed on the
linktest packet between the AP and the client.ro TimeInterval UNITS "hundredths-seconds" .1.3.6.1.4.1.9.9.516.1.2.2.1.8 |
cLLtClientLtUplinkMinRSSIThe minimum RSSI value as observed at the
AP.ro Integer32 UNITS "dBm" .1.3.6.1.4.1.9.9.516.1.2.2.1.9 |
cLLtClientLtUplinkMaxRSSIThe maximum RSSI value as observed at the
AP.ro Integer32 UNITS "dBm" .1.3.6.1.4.1.9.9.516.1.2.2.1.10 |
cLLtClientLtUplinkAvgRSSIThe average RSSI value as observed at the
AP.ro Integer32 UNITS "dBm" .1.3.6.1.4.1.9.9.516.1.2.2.1.11 |
cLLtClientLtDownlinkMinRSSIThe minimum RSSI value as observed at the
client.ro Integer32 UNITS "dBm" .1.3.6.1.4.1.9.9.516.1.2.2.1.12 |
cLLtClientLtDownlinkMaxRSSIThe maximum RSSI value as observed at the
client.ro Integer32 UNITS "dBm" .1.3.6.1.4.1.9.9.516.1.2.2.1.13 |
cLLtClientLtDownlinkAvgRSSIThe average RSSI value as observed at the
client.ro Integer32 UNITS "dBm" .1.3.6.1.4.1.9.9.516.1.2.2.1.14 |
cLLtClientLtUplinkMinSNRThe minimum SNR value as observed at the
AP.ro Integer32 UNITS "dB" .1.3.6.1.4.1.9.9.516.1.2.2.1.15 |
cLLtClientLtUplinkMaxSNRThe maximum SNR value as observed at the
AP.ro Integer32 UNITS "dB" .1.3.6.1.4.1.9.9.516.1.2.2.1.16 |
cLLtClientLtUplinkAvgSNRThe average SNR value as observed at the
AP.ro Integer32 UNITS "dB" .1.3.6.1.4.1.9.9.516.1.2.2.1.17 |
cLLtClientLtDownlinkMinSNRThe minimum SNR value as observed at the
client.ro Integer32 UNITS "dB" .1.3.6.1.4.1.9.9.516.1.2.2.1.18 |
cLLtClientLtDownlinkMaxSNRThe maximum SNR value as observed at the
client.ro Integer32 UNITS "dB" .1.3.6.1.4.1.9.9.516.1.2.2.1.19 |
cLLtClientLtDownlinkAvgSNRThe average SNR value as observed at the
client.ro Integer32 UNITS "dB" .1.3.6.1.4.1.9.9.516.1.2.2.1.20 |
cLLtClientLtTotalTxRetriesAPThe total number of linktest packet transmission
retries as observed at the AP.ro Counter32 UNITS "retries" .1.3.6.1.4.1.9.9.516.1.2.2.1.21 |
cLLtClientLtMaxTxRetriesAPThe maximum number of linktest packet transmission
retries observed at the AP.ro Counter32 UNITS "retries" .1.3.6.1.4.1.9.9.516.1.2.2.1.22 |
cLLtClientLtTotalTxRetriesClientThe total number of linktest packet transmission
retries at the client.ro Counter32 UNITS "retries" .1.3.6.1.4.1.9.9.516.1.2.2.1.23 |
cLLtClientLtMaxTxRetriesClientThe maximum number of linktest packet transmission
retries observed at the client.ro Counter32 UNITS "retries" .1.3.6.1.4.1.9.9.516.1.2.2.1.24 |
cLLtClientLtStatusThis object indicates the status of the linktest
this particular entry corresponds to.
The semantics as follows.
'cLLtClientLtStatusFailed' - This value indicates that
this particular linktest has failed.
'cLLtClientLtCcxStatusInProgress' - This value indicates
that the CCX linktest is in progress.
'cLLtClientLtPngStatusInProgress' - This value indicates
that the Ping-based linktest is in progress.
'cLLtClientLtStatusPingSuccess' - This value indicates
that ping-based linktest between AP and client
has succeeded.
Only the following columns of this table should be
considered for collecting data from the ping
responses.
cLLtClientLtPacketsSent,
cLLtClientLtPacketsRx,
cLLtClientLtUplinkAvgRSSI,
cLLtClientLtUplinkAvgSNR
cLLtClientLtStatusCcxLtSuccess - This value indicates
that CCX linktest done to test the link between the
client and the AP is successful. All the columns of
this table are applicable and valid for collecting
data from the CCX responses.ro Enumeration .1.3.6.1.4.1.9.9.516.1.2.2.1.25 |
ciscoLwappLinkTestStatus OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.516.1.3 |
cLLtClientLtDataRateTableThis table provides the results of CCX Link tests
classified on different data rates between AP and
clients.
A row is added to this table automatically by the
agent corresponding to one linktest identified
by cLLtClientLtIndex and deleted when the
corresponding row in cLLtClientLinkTestTable is
deleted. SEQUENCE OF CLLtClientLtDataRateEntry .1.3.6.1.4.1.9.9.516.1.3.1 |
cLLtClientLtDataRateEntryEach entry represents a conceptual row and
populates the number of packets sent in
the linktest identified by cLLtClientLtIndex.
The statistics of the linktest are classified
based on the respective data rates identified
by cLLtClientLtDataRate. CLLtClientLtDataRateEntry .1.3.6.1.4.1.9.9.516.1.3.1.1 |
cLLtClientLtDataRateThis object identifies the rate at which packets
are transmitted. The rates are defined in Mbps
with the following being the possible values.
Rates - 1,2,5.5,6,9,11,12,18,24,36,48,54,108. OCTET STRING .1.3.6.1.4.1.9.9.516.1.3.1.1.1 |
cLLtClientLtRateDownlinkPktsSentThe number of packets sent by the AP at the rate
identified by cLLtClientLtDataRate.ro Counter32 UNITS "packets" .1.3.6.1.4.1.9.9.516.1.3.1.1.2 |
cLLtClientLtRateUplinkPktsSentThe number of packets sent by the client at the rate
identified by cLLtClientLtDataRate.ro Counter32 UNITS "packets" .1.3.6.1.4.1.9.9.516.1.3.1.1.3 |
ciscoLwappLinkTestMIBConform OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.516.2 |
ciscoLwappLinkTestMIBCompliances OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.516.2.1 |
ciscoLwappLinkTestMIBGroups OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.516.2.2 |