CADANT-MAP-STATS-MIB

All MIBs › CADANT-MAP-STATS-MIB

Organization: Arris International, Inc.

Last Updated: 2008-10-23

Category: DOCSIS and Cable, Vendor: ARRIS

Description: Monitors upstream MAP (bandwidth allocation map) statistics and scheduling performance on ARRIS/Cadant CMTS.

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What Is CADANT-MAP-STATS-MIB?

CADANT-MAP-STATS-MIB is an ARRIS/Cadant enterprise MIB that reports statistics from the DOCSIS upstream "map-maker" process, the CMTS component that generates MAP (bandwidth allocation) messages controlling upstream transmission opportunities for cable modems, one instance per upstream channel. It exposes counters for total MAPs sent, fragmented grants, UGS/UGS-AD (unsolicited grant service) state transitions, extended-header switches, bad MAP counts, and mini-slot allocation and utilization totals. This is a performance/health MIB for upstream bandwidth scheduling software, elevated bad-MAP or fragmented-grant counts can reveal upstream congestion, misbehaving modems, or scheduler problems affecting real-time services like VoIP. It operates on top of the DOCSIS upstream channel model defined by standard DOCSIS MIBs though the counters themselves are Cadant-proprietary. It is deployed on ARRIS/Cadant CMTS headend equipment to diagnose upstream bandwidth-allocation performance per channel. Engineers can download the CADANT-MAP-STATS-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CADANT-MAP-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/Cadant CMTS (cable modem termination system)

Monitoring Examples

An operator would poll cadMapStatsBaseTable/cadMapStatsBaseEntry for cadMapStatsTotalMapsSent and cadMapStatsTotalBadMaps per upstream channel, a rising bad-MAP rate against a steady total-MAPs-sent rate would indicate map-maker or channel problems. Checking cadMapStatsTotalFragmentedGrants and cadMapStatsTotalUgsQiTransitions helps reveal whether latency-sensitive UGS (voice) flows are experiencing scheduling instability. Reviewing cadMapStatsMSlotsTable's cadMapStatsTotalMSlots versus cadMapStatsTotalUCastGrantedMSlots shows how much upstream mini-slot capacity is actually being granted to modems versus theoretically available.

What Can Be Monitored

MAPs sent per upstream channel
bad MAP count
fragmented grant count
UGS/UGS-AD transition count
mini-slot allocation/utilization

Imported Objects

From CADANT-PRODUCTS-MIB

cadSpectrum

OBJECT-IDENTITY

From CADANT-TC

FlowActivityState

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-SMI

Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using cadMapStatsTotalMapsSent OID:

Select an ARRIS/Cadant C4/E6000 CMT (cable modem termination system) 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 cadMapStatsTotalMapsSent 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 number of maps transmitted downstream for this UChannel. 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 Counter64-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
cadMapStatsMib	1.3.6.1.4.1.4998.1.1.15.10			This MIB contains objects to display counts and statistical information for the DOCSIS map-makers. There exists a single map-maker for each upstream channel. The map-makers hold the keys to the upstream bandwidth. Thus, one is able to gain insight into how the upstream bandwidth is being managed by analyzing the various map-maker counts and statistics in this MIB.
cadMapStatsBaseTable	1.3.6.1.4.1.4998.1.1.15.10.1		not-accessible
cadMapStatsBaseEntry	1.3.6.1.4.1.4998.1.1.15.10.1.1		not-accessible
C64 cadMapStatsTotalMapsSentEx	1.3.6.1.4.1.4998.1.1.15.10.1.1.1	Counter64	read-only	Total number of maps transmitted downstream for this UChannel.
C64 cadMapStatsTotalFragmentedGrants	1.3.6.1.4.1.4998.1.1.15.10.1.1.2	Counter64	read-only	Total number of fragmented bandwidth grants for this UChannel.
C64 cadMapStatsTotalUgsQiTransitions	1.3.6.1.4.1.4998.1.1.15.10.1.1.3	Counter64	read-only	Total number of UGS QI transitions. Useful for debugging VoIP.
C64 cadMapStatsTotalUgsadTransitions	1.3.6.1.4.1.4998.1.1.15.10.1.1.4	Counter64	read-only	Total number of UGSAD flow transitions. Useful for debugging VoIP.
C64 cadMapStatsTotalUgsEHdrsSw	1.3.6.1.4.1.4998.1.1.15.10.1.1.5	Counter64	read-only	Total number of UGS Service Flow Extended Headers processed in software. Useful for debugging VoIP.
C64 cadMapStatsTotalBadMaps	1.3.6.1.4.1.4998.1.1.15.10.1.1.6	Counter64	read-only	Total number of maps discarded due to errors for this UChannel
cadMapStatsMSlotsTable	1.3.6.1.4.1.4998.1.1.15.10.2		not-accessible
cadMapStatsMSlotsEntry	1.3.6.1.4.1.4998.1.1.15.10.2.1		not-accessible
C64 cadMapStatsTotalMSlots	1.3.6.1.4.1.4998.1.1.15.10.2.1.1	Counter64	read-only	Total Minislots count for this UChannel.
C64 cadMapStatsTotalUCastGrantedMSlots	1.3.6.1.4.1.4998.1.1.15.10.2.1.2	Counter64	read-only	Total Minislots granted to Unicast for this UChannel.
C64 cadMapStatsTotalBwRequestMSlots	1.3.6.1.4.1.4998.1.1.15.10.2.1.3	Counter64	read-only	Total Minislots requested via bandwidth requests for this UChannel. This count does not include requests dropped due to SuperGreedy in hardware.
C64 cadMapStatsTotalSkippedMSlots	1.3.6.1.4.1.4998.1.1.15.10.2.1.4	Counter64	read-only	Total Minislots not granted because the MapMaker was behind.
C64 cadMapStatsTotalLogicalNullPadMSlots	1.3.6.1.4.1.4998.1.1.15.10.2.1.5	Counter64	read-only	Total Minislots allocated to the NULL SID for a logical channel which is inactive
cadMapStatsMSlotsPerIUCTable	1.3.6.1.4.1.4998.1.1.15.10.3		not-accessible
cadMapStatsMSlotsPerIUCEntry	1.3.6.1.4.1.4998.1.1.15.10.3.1		not-accessible
CAD cadMapStatsMSlotsPerIUCId	1.3.6.1.4.1.4998.1.1.15.10.3.1.1	CadMapStatsIUCTypeId	not-accessible
C64 cadMapStatsGrantedBCastMSlots	1.3.6.1.4.1.4998.1.1.15.10.3.1.2	Counter64	read-only	For each IUC type, the total number of minislots granted to the Broadcast SID.
C64 cadMapStatsGrantedMCastMSlots	1.3.6.1.4.1.4998.1.1.15.10.3.1.3	Counter64	read-only	For each IUC type, the total number of minislots granted to Multicast SIDs.
C64 cadMapStatsGrantedUCastMSlots	1.3.6.1.4.1.4998.1.1.15.10.3.1.4	Counter64	read-only	For each IUC type, the total number of minislots granted to Unicast SIDs.
C64 cadMapStatsGrantedZeroSidMSlots	1.3.6.1.4.1.4998.1.1.15.10.3.1.5	Counter64	read-only	For each IUC type, the total number of minislots granted to the Zero SID.
cadMapStatsBwRequestsTable	1.3.6.1.4.1.4998.1.1.15.10.4		not-accessible
cadMapStatsBwRequestsEntry	1.3.6.1.4.1.4998.1.1.15.10.4.1		not-accessible
C64 cadMapStatsTotalBwRequests	1.3.6.1.4.1.4998.1.1.15.10.4.1.1	Counter64	read-only	Total number of Bandwidth Requests processed for this UChannel. This count does not include requests dropped due to SuperGreedy in hardware.
C64 cadMapStatsTotalBwRequestSchedulerDrops	1.3.6.1.4.1.4998.1.1.15.10.4.1.2	Counter64	read-only	Total number of Bandwidth Requests dropped by the MapMaker without giving a grant or grant pending. This count does not include grant pending drops.
C64 cadMapStatsTotalBwRequestSuperGreedyDrops	1.3.6.1.4.1.4998.1.1.15.10.4.1.3	Counter64	read-only	Total number of Bandwidth Requests dropped due to the service flow being in the super greedy state. This should not happen if the cable modem is properly policing its service flows.
U32 cadMapStatsPeakBwRequestSize	1.3.6.1.4.1.4998.1.1.15.10.4.1.4	Unsigned32	read-only	The peak size of a Bandwidth request received since the last read.
U32 cadMapStatsPeakBwRequestsPerMap	1.3.6.1.4.1.4998.1.1.15.10.4.1.5	Unsigned32	read-only	The peak number of Bandwidth requests per map received since the last read.
cadMapStatsGrantPendingsTable	1.3.6.1.4.1.4998.1.1.15.10.5		not-accessible
cadMapStatsGrantPendingsEntry	1.3.6.1.4.1.4998.1.1.15.10.5.1		not-accessible
C64 cadMapStatsTotalGrantPendings	1.3.6.1.4.1.4998.1.1.15.10.5.1.1	Counter64	read-only	Total number of Grant Pendings given for this UChannel.
C64 cadMapStatsTotalGrantPendingDrops	1.3.6.1.4.1.4998.1.1.15.10.5.1.2	Counter64	read-only	Total number of Grant Pendings Dropped by the MapMaker for this UChannel. These are dropped primarily for pending for too long or too many grants pending per map.
C64 cadMapStatsTotalGrantPendingPromos	1.3.6.1.4.1.4998.1.1.15.10.5.1.3	Counter64	read-only	Total number of Grant Pendings Promoted by the MapMaker to a higher priority (less greedy) queue for this UChannel.
U32 cadMapStatsPeakGrantPendingsPerMap	1.3.6.1.4.1.4998.1.1.15.10.5.1.4	Unsigned32	read-only	The peak number of Bandwidth requests per map received since the last read.
cadMapStatsBwRequestQueuesTable	1.3.6.1.4.1.4998.1.1.15.10.6		not-accessible
cadMapStatsBwRequestQueuesEntry	1.3.6.1.4.1.4998.1.1.15.10.6.1		not-accessible
FLO cadMapStatsBwRequestQueuesFlowState	1.3.6.1.4.1.4998.1.1.15.10.6.1.1	FlowActivityState	not-accessible
CAD cadMapStatsBwRequestQueuesPriorityId	1.3.6.1.4.1.4998.1.1.15.10.6.1.2	CadMapStatsBwRequestQueuesPriorityId	not-accessible
C64 cadMapStatsBwRequestQueuesNumAdds	1.3.6.1.4.1.4998.1.1.15.10.6.1.3	Counter64	read-only	For each Bandwidth Request priority Queue, the total number of bandwidth requests added to this queue. This includes requests promoted from lower priority queues.
C64 cadMapStatsBwRequestQueuesNumDrops	1.3.6.1.4.1.4998.1.1.15.10.6.1.4	Counter64	read-only	For each Bandwidth Request priority Queue, the total number of requests dropped. These are dropped primarily for pending for too long or too many grants pending per map.
C64 cadMapStatsBwRequestQueuesNumPendings	1.3.6.1.4.1.4998.1.1.15.10.6.1.5	Counter64	read-only	For each Bandwidth Request priority Queue, the total number of grant pendings given to bandwidth requests on this queue.
C64 cadMapStatsBwRequestQueuesNumPromos	1.3.6.1.4.1.4998.1.1.15.10.6.1.6	Counter64	read-only	For each Bandwidth Request priority Queue, the total number of bandwidth requests promoted from this queue to a higher priority (less greedy) queue.
U32 cadMapStatsBwRequestQueuesNumElements	1.3.6.1.4.1.4998.1.1.15.10.6.1.7	Unsigned32	read-only	For each Bandwidth Request priority Queue, the current number of bandwidth requests in the queue.
C64 cadMapStatsBwRequestQueuesLatencySum	1.3.6.1.4.1.4998.1.1.15.10.6.1.8	Counter64	read-only	For each Bandwidth Request priority Queue, the sum of the latency in usecs for each bandwidth request from receive time to grant or drop time. Latency for requests which are promoted is counted in the promoted to queue.
cadMapStatsPeriodicFlowsTable	1.3.6.1.4.1.4998.1.1.15.10.7		not-accessible
cadMapStatsPeriodicFlowsEntry	1.3.6.1.4.1.4998.1.1.15.10.7.1		not-accessible
U32 cadMapStatsNumNrtpsFlows	1.3.6.1.4.1.4998.1.1.15.10.7.1.1	Unsigned32	read-only	Current number of scheduled NRTPS flows for this UChannel.
U32 cadMapStatsNumRtpsFlows	1.3.6.1.4.1.4998.1.1.15.10.7.1.2	Unsigned32	read-only	Current number of scheduled RTPS flows scheduled for this UChannel.
U32 cadMapStatsNumUgsadActiveFlows	1.3.6.1.4.1.4998.1.1.15.10.7.1.3	Unsigned32	read-only	Current number of scheduled UGSAD flows in the Active (UGS) mode for this UChannel.
U32 cadMapStatsNumUgsadPollingFlows	1.3.6.1.4.1.4998.1.1.15.10.7.1.4	Unsigned32	read-only	Current number of scheduled UGSAD flows in the Polling (RTPS) mode for this UChannel.
U32 cadMapStatsNumUgsFlows	1.3.6.1.4.1.4998.1.1.15.10.7.1.5	Unsigned32	read-only	Current number of scheduled UGS flows for this UChannel.
U32 cadMapStatsNumBEPollingFlows	1.3.6.1.4.1.4998.1.1.15.10.7.1.6	Unsigned32	read-only	Current number of scheduled Best Effort Polling flows for this UChannel. These are NRTPS request opportunities given to Best Effort flows based on the flow priority and guaranteed minimum reserved rate. This includes flows using both the fast and slow polling intervals.
U32 cadMapStatsNumBEFastPollingFlows	1.3.6.1.4.1.4998.1.1.15.10.7.1.7	Unsigned32	read-only	Current number of scheduled Best Effort Fast Polling flows for this UChannel.

RFC description

Cadant/Arris DOCSIS MAP statistics MIB for cable modem termination system management. Tracks upstream bandwidth allocation and map-maker performance metrics.

Start monitoring ARRIS/Cadant C4/E6000 CMTS (cable modem termination system) 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-MAP-STATS-MIB