CADANT-REMOTE-QUERY-MIB

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Organization: Arris International

Last Updated: 2009-01-20

Category: DOCSIS and Cable, Vendor: ARRIS

Description: Manages remote cable modem query operations and status polling on ARRIS/Cadant CMTS platforms.

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What Is CADANT-REMOTE-QUERY-MIB?

CADANT-REMOTE-QUERY-MIB manages the CMTS's built-in Remote Query feature on the ARRIS/Cadant C4, which lets the CMTS itself perform SNMP polling of remote cable modems on the operator's behalf. It exposes configuration objects (poller enable, poll interval, start/stop time, SNMP community) and status objects for the poller and for each remote cable modem's poll results. Its central use is monitoring the software-level health of the polling subsystem and, transitively, the reachability of remote cable modems, tracking whether the poller is running on schedule and when each modem was last successfully queried. It depends on the DOCSIS remote-query/cable-device MIB conventions referenced in its conformance section. It's deployed by cable MSOs to track cable modem population health at scale without opening direct per-modem SNMP sessions from the management station. Engineers can download the CADANT-REMOTE-QUERY-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CADANT-REMOTE-QUERY-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

ARRIS/Cadant C4 CMTS
cable modems polled via the CMTS

Monitoring Examples

An operator checks cadCmRemoteQueryPollerEnable and cadCmRemoteQueryPollerInterval to confirm the CMTS's built-in remote-CM poller is active and running on schedule, then reviews cadCmRemoteQueryStatusTable entries (cadCmRemoteQueryPollTime, keyed by cadCmRemoteQueryMacAddress) to see when each cable modem was last successfully queried. If cadCmRemoteQueryPollTime stalls for a given MAC address, it indicates that modem has become unreachable or is failing to respond to the CMTS's relayed SNMP polls despite still being registered.

What Can Be Monitored

poller enable/disable state
poll interval and schedule window
SNMP community used for polling
per-modem last poll time
cable modem MAC address reachability

Imported Objects

From CADANT-CMTS-MAC-MIB

cadIfCmtsCmStatusEntry

OBJECT-TYPE

From CADANT-PRODUCTS-MIB

cadCmRemoteQuery

OBJECT-IDENTITY

From DOCS-IF-MIB

TenthdB
TenthdBmV

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DisplayString
MacAddress
TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using cadCmRemoteQuerySigQMicroreflections OID:

Select an ARRIS/Cadant CMTS device or cable modem as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cadCmRemoteQuerySigQMicroreflections into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. It reports the total microreflections including in-channel response as perceived on the CM downstream, measured in dBc below the signal level. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is an Integer32-type OID, Value bounds is the most useful condition here — trigger an alert if the value drifts significantly from its normal baseline, since an unexpected change often points to a real underlying issue. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
cadCmRemoteQueryMib	1.3.6.1.4.1.4998.1.1.55.1			This MIB module provides the management of the Cadant C4 Cable Modem Termination Systems (CMTS) Remote Query feature. This feature, implemented on a CMTS, facilitates SNMP polling of remote cable modems (CMs). This MIB includes the configuration and status objects of the CMTS CM Poller and remote CMs that polled by the CMTS CM Poller
cadCmRemoteQueryPoller	1.3.6.1.4.1.4998.1.1.55.1.1
T/F cadCmRemoteQueryPollerEnable	1.3.6.1.4.1.4998.1.1.55.1.1.1	TruthValue	read-write	An indication of whether the CMTS CM Poller is running. When the poller is enabled, it polls the remote CMs periodically specified in the cadCmRemoteQueryPollerInterval mib object. The operation can be expensive depending on how many CMs that the poller would be polling. It is suggested to have it disabled when not needed.
U32 cadCmRemoteQueryPollerInterval	1.3.6.1.4.1.4998.1.1.55.1.1.2	Unsigned32	read-write	An interval between two polling cycles of the CMTS CM Poller. The poller will not start the next cycle until it finished polling for the last CM , even though the time has expired. If the cadCmRemoteQueryPollerInterval is too small with a large number of CMs, the poller would tie up the CPU and resources and possibly degrade the system's performance.
U32 cadCmRemoteQueryPollerStartTime	1.3.6.1.4.1.4998.1.1.55.1.1.3	Unsigned32	read-only	The value of sysUpTime in seconds when the last polling cycle started. cadCmRemoteQueryPollerStartTime is set to 0 when the CMTS is first restarted and doesn't get reset after the poller is disabled.
U32 cadCmRemoteQueryPollerStopTime	1.3.6.1.4.1.4998.1.1.55.1.1.4	Unsigned32	read-only	The value of sysUpTime in seconds when the last polling cycle finished. cadCmRemoteQueryPollerStopTime is set to 0 when the CMTS is first restarted and doesn't get reset after the poller is disabled.
OCT cadCmRemoteQueryPollerCommunity	1.3.6.1.4.1.4998.1.1.55.1.1.5	OCTET STRING	read-write	The read community string is used for polling the CMs. Any change in the cadCmRemoteQueryPollerCommunity may not be reflected if the poller has already been enabled.
MAC cadCmRemoteQueryMacAddress	1.3.6.1.4.1.4998.1.1.55.1.1.6	MacAddress	read-write	The object is used to trigger an immediate poll of a specific CM. This object always read back as a value of 0. The value of sysUpTime should be read and saved before writing this object. Then, the value of cadCmRemoteQueryPollTime can be read and compared to the saved sysUpTime to determine when the immediate poll of retmoe query data has been completed.
IPt cadCmRemoteQuerySourceIpAddrType	1.3.6.1.4.1.4998.1.1.55.1.1.7	InetAddressType	read-only	The type of internet address of cadCmRemoteQuerySourceIpAddr.
IP cadCmRemoteQuerySourceIpAddr	1.3.6.1.4.1.4998.1.1.55.1.1.8	InetAddress	read-only	The source IP address of the SNMP remote queries to the CMs. This value is changed from the Poller when the ifIndex of the cadSysSourceInterfaceRemoteQuery in the CADANT-CMTS-SYSTEM-MIB is changed due to using the cli command .. configure cable modem remote-query source-interface ..
cadCmRemoteQueryStatusTable	1.3.6.1.4.1.4998.1.1.55.1.2		not-accessible	This table contains the status of the cable modems that are polled by the CMTS CM Poller. The information will be overwritten when a new polling cycle starts. Depending on how many CMs that the poller is polling, polling this table constantly can be quite expensive; Excessive polling could degrade performance.
cadCmRemoteQueryStatusEntry	1.3.6.1.4.1.4998.1.1.55.1.2.1		not-accessible	A list of the cable modem's attributes that are polled by a CMTS.
U32 cadCmRemoteQueryPollTime	1.3.6.1.4.1.4998.1.1.55.1.2.1.1	Unsigned32	read-only	The value of sysUpTime when this CM entry was polled. If this value is larger than the cadCmRemoteQueryPollerStopTime, it indicates that the status has already been overwritten by a new polling cycle. To avoid this happening, the NMS can increase the cadCmRemoteQueryPollInterval so that the cadCmRemoteQueryPollTime would fall in between the cadCmRemoteQueryPollerStartTime and the cadCmRemoteQueryPollerStopTime.
TEN cadCmRemoteQueryDownChannelPower	1.3.6.1.4.1.4998.1.1.55.1.2.1.2	TenthdBmV	read-only	The CM's received power level. This object may be set to zero if the CM does not support power level measurement. If the CM downstream interface is down, this object either returns the most current value or the value of 0.
TEN cadCmRemoteQueryStatusTxPower	1.3.6.1.4.1.4998.1.1.55.1.2.1.3	TenthdBmV	read-only	The operational transmit power for the CM upstream channel.
U32 cadCmRemoteQueryUpChnlTxTimingOffset	1.3.6.1.4.1.4998.1.1.55.1.2.1.4	Unsigned32	read-only	A measure of the current round trip time. Used for timing of CM upstream transmissions to ensure synchronized arrivals at the CMTS.
TEN cadCmRemoteQuerySigQSignalNoise	1.3.6.1.4.1.4998.1.1.55.1.2.1.5	TenthdB	read-only	Signal/Noise ratio as perceived for the CM downstream channel.
I32 cadCmRemoteQuerySigQMicroreflectionsEx	1.3.6.1.4.1.4998.1.1.55.1.2.1.6	Integer32	read-only	Total microreflections including in-channel response as perceived on the CM downstream, measured in dBc below the signal level. This object is not assumed to return an absolutely accurate value, but is meant to give a rough indication of microreflections received on this interface. It is up to the implementor to provide information as accurate as possible.
STR cadCmRemoteQuerySysDescr	1.3.6.1.4.1.4998.1.1.55.1.2.1.7	DisplayString	read-only	A textual description of the entity.
cadCmRemoteQueryConformance	1.3.6.1.4.1.4998.1.1.55.1.3
cadCmRemoteQueryDocsRemoteQueryCompliances	1.3.6.1.4.1.4998.1.1.55.1.3.1
cadCmRemoteQueryDocsRemoteQueryCompliance	1.3.6.1.4.1.4998.1.1.55.1.3.1.1			The compliance statement for entities which implement the Remote Query MIB
cadCmRemoteQueryDocsRemoteQueryGroups	1.3.6.1.4.1.4998.1.1.55.1.3.2
cadCmRemoteQueryPollerGroup	1.3.6.1.4.1.4998.1.1.55.1.3.2.1			Group of objects implemented in Cable Modem Termination Systems (CMTS) for configuring and monitoring the CMTS CM Poller.
cadCmRemoteQueryStatusGroup	1.3.6.1.4.1.4998.1.1.55.1.3.2.2			Group of objects implemented in Cable Modem Termination Systems (CMTS) for monitoring cable modems via CMTS CM Poller.

RFC description

Manages CMTS remote query feature for polling remote cable modems (CMs) via SNMP on Cadant C4 Cable Modem Termination Systems.

Start monitoring ARRIS/Cadant CMTS devices and cable modems with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CADANT-REMOTE-QUERY-MIB