ARRIS-C3-STATS-MIB

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Organization: Arris International

Last Updated: 2003-08-20

Category: DOCSIS and Cable, Vendor: ARRIS

Description: ARRIS C3 CMTS traffic statistics including upstream/downstream throughput and error counters.

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What Is ARRIS-C3-STATS-MIB?

ARRIS-C3-STATS-MIB is an Arris International vendor MIB, under the cmtsC3 branch, that exposes proprietary traffic statistics for the Arris CMTS C3 cable modem termination system, supplementing the standard DOCS-IF-MIB. It defines dcxUpstreamStatsTable, indexed per upstream interface, counting cable modems in each DOCSIS ranging/registration state (dcxUsStatsRanging, dcxUsStatsRngAborted, dcxUsStatsRngComplete, dcxUsStatsIpComplete, dcxUsStatsRegComplete, dcxUsStatsAccessDenied) referenced against docsIfCmtsCmStatusValue, and dcxCmtsServiceTable, which AUGMENTS the standard docsIfCmtsServiceEntry with downstream byte/packet counters (dcxCmtsServiceOutOctets, dcxCmtsServiceOutPackets) and upstream/downstream bandwidth-excess counters (cdxCmtsServiceUpBWExcessReqs, cdxCmtsServiceDownBWExcessPkts). This gives operators visibility into how many cable modems are stuck in ranging versus fully registered on each upstream, and whether individual service flows are exceeding their provisioned bandwidth, both key indicators of RF plant or provisioning problems. It depends on DOCS-IF-MIB for the underlying CMTS service and interface tables it extends/augments. It is deployed on Arris C3 CMTS platforms in cable-operator headends, and administrators can download the ARRIS-C3-STATS-MIB file to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ARRIS-C3-STATS-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 CMTS C3 cable modem termination system

Monitoring Examples

An operator polls dcxUpstreamStatsTable per upstream interface and compares dcxUsStatsRngAborted and dcxUsStatsAccessDenied against dcxUsStatsRegComplete; a rising count of aborted-ranging or access-denied modems relative to fully registered modems on one upstream would indicate RF noise, ingress, or provisioning problems isolated to that upstream segment.

What Can Be Monitored

modem counts by DOCSIS ranging/registration state per upstream
downstream service byte/packet counters
upstream bandwidth-excess request counters
downstream bandwidth-excess packet counters

Imported Objects

From ARRIS-MIB

cmtsC3

OBJECT-IDENTITY

From DOCS-IF-MIB

docsIfCmtsServiceEntry

OBJECT-TYPE

From IF-MIB

InterfaceIndexOrZero
ifIndex	OBJECT-TYPE

From SNMPv2-SMI

Counter32
Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
enterprises

How to Use in IPNetwork Monitor

Example using dcxUsStatsOther OID:

Select an ARRIS (Cadant) C3 CMT (Cable Modem Termination System) (legacy) 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 dcxUsStatsOther 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 number of modems on this upstream in state docsIfCmtsCmStatusValue_other. 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 a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
cmtsC3StatsMIB	1.3.6.1.4.1.4115.1.4.3.1			This MIB manages proprietary statistics on the Arris CMTS C3
dcxUpstreamStatsObjects	1.3.6.1.4.1.4115.1.4.3.1.1
dcxUpstreamStatsTable	1.3.6.1.4.1.4115.1.4.3.1.1.1		not-accessible	.
dcxUpstreamStatsEntry	1.3.6.1.4.1.4115.1.4.3.1.1.1.1		not-accessible	Counts the modems on each upstream by state. The states are as defined by the DOCS-IF-MIB variable docsIfCmtsCmStatusValue
C32 dcxUsStatsOtherEx	1.3.6.1.4.1.4115.1.4.3.1.1.1.1.1	Counter32	read-only	Number of modems on this upstream in state docsIfCmtsCmStatusValue_other
C32 dcxUsStatsRanging	1.3.6.1.4.1.4115.1.4.3.1.1.1.1.2	Counter32	read-only	Number of modems on this upstream in state docsIfCmtsCmStatusValue_ranging
C32 dcxUsStatsRngAborted	1.3.6.1.4.1.4115.1.4.3.1.1.1.1.3	Counter32	read-only	Number of modems on this upstream in state docsIfCmtsCmStatusValue_rangingAborted
C32 dcxUsStatsRngComplete	1.3.6.1.4.1.4115.1.4.3.1.1.1.1.4	Counter32	read-only	Number of modems on this upstream in state docsIfCmtsCmStatusValue_rangingComplete
C32 dcxUsStatsIpComplete	1.3.6.1.4.1.4115.1.4.3.1.1.1.1.5	Counter32	read-only	Number of modems on this upstream in state docsIfCmtsCmStatusValue_ipComplete
C32 dcxUsStatsRegComplete	1.3.6.1.4.1.4115.1.4.3.1.1.1.1.6	Counter32	read-only	Number of modems on this upstream in state docsIfCmtsCmStatusValue_registrationComplete
C32 dcxUsStatsAccessDenied	1.3.6.1.4.1.4115.1.4.3.1.1.1.1.7	Counter32	read-only	Number of modems on this upstream in state docsIfCmtsCmStatusValue_accessDenied
NUM dcxUsStatsIfIndex	1.3.6.1.4.1.4115.1.4.3.1.1.1.1.8	InterfaceIndexOrZero	read-only	ifIndex of the upstream interface corresponding to this row
dcxCmtsServiceStatsObjects	1.3.6.1.4.1.4115.1.4.3.1.2
dcxCmtsServiceTable	1.3.6.1.4.1.4115.1.4.3.1.2.1		not-accessible	The table augments the D1.0 docsIfCmtsServiceTable with downstream variables.
dcxCmtsServiceEntry	1.3.6.1.4.1.4115.1.4.3.1.2.1.1		not-accessible	The table augments the D1.0 docsIfCmtsServiceTable with downstream variables.
C32 dcxCmtsServiceOutOctets	1.3.6.1.4.1.4115.1.4.3.1.2.1.1.1	Counter32	read-only	The total number of bytes transmitted downstream for this SID
C32 dcxCmtsServiceOutPackets	1.3.6.1.4.1.4115.1.4.3.1.2.1.1.2	Counter32	read-only	The total number of packets transmitted downstream for this SID
C32 cdxCmtsServiceUpBWExcessReqs	1.3.6.1.4.1.4115.1.4.3.1.2.1.1.3	Counter32	read-only	The number of upstream requests which have exceeded the maximum upstream bandwidth allowed for this SID, and have beenn rejected by the scheduler's rate limiting.
C32 cdxCmtsServiceDownBWExcessPkts	1.3.6.1.4.1.4115.1.4.3.1.2.1.1.4	Counter32	read-only	The number of downstream packets that have been dropped by the DS policer as a result of exceeding the service's rate limit.

RFC description

Manages proprietary statistics on the Arris CMTS C3, including upstream modem state counts and performance metrics.

Start monitoring ARRIS (Cadant) C3 CMTS (Cable Modem Termination System) (legacy) 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 ARRIS-C3-STATS-MIB