ARISTA-ASIC-COUNTERS-MIB

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Organization: Arista Networks, Inc.

Last Updated: 2021-02-03

Category: Vendor: Arista

Description: Arista EOS ASIC-level hardware packet counters for silicon performance diagnostics.

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What Is ARISTA-ASIC-COUNTERS-MIB?

ARISTA-ASIC-COUNTERS-MIB is a vendor-specific MIB from Arista Networks (EOS) exposing low-level hardware packet-drop counters gathered directly from the switch's forwarding ASIC(s), intended for silicon-level performance and health diagnostics. It provides per-chip, per-counter drop statistics along with rate aggregations over multiple time windows (1 minute, 10 minutes, 1 hour, 1 day, 1 week), letting operators see both instantaneous and trending drop behavior. This is fundamentally hardware performance-counter monitoring: aristaAsicInternalDropStatsCount and its time-windowed variants reveal whether a specific ASIC/chip is silently dropping packets internally (e.g., due to buffer exhaustion or a hardware fault), which is otherwise invisible to standard interface counters. It depends on Arista's underlying entity/chip-naming conventions to identify which ASIC (aristaAsicInternalDropStatsChipName) a given counter belongs to. It is deployed specifically on Arista EOS switches, especially high-throughput data-center switches where silicon-level packet loss must be distinguished from interface-level congestion, and engineers can complete an ARISTA-ASIC-COUNTERS-MIB download to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ARISTA-ASIC-COUNTERS-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

Arista Networks EOS switch

Monitoring Examples

An administrator would poll aristaAsicInternalDropStatsTable keyed by aristaAsicInternalDropStatsChipName and aristaAsicInternalDropStatsCounterName to see which internal ASIC drop counter (e.g., a specific forwarding-pipeline stage) is incrementing. Comparing aristaAsicInternalDropStats1Min against aristaAsicInternalDropStats1Hr or aristaAsicInternalDropStats1Day would reveal whether a burst of internal drops is a transient spike or a sustained hardware-level problem, and aristaAsicInternalDropStatsFirstTime pinpoints when the anomaly began. This is especially useful for diagnosing silicon-level packet loss that standard interface error counters wouldn't show.

What Can Be Monitored

ASIC internal drop counts
per-chip drop statistics
1-minute/10-minute/hourly/daily/weekly drop rate trends
first-occurrence time of a drop counter

Imported Objects

From ARISTA-SMI-MIB

aristaMibs

OBJECT-IDENTITY

From HCNUM-TC

CounterBasedGauge64

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter64
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DisplayString
TimeStamp

How to Use in IPNetwork Monitor

Example using aristaAsicInternalDropStatsCount OID:

Select an Arista Networks EOS switch 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 aristaAsicInternalDropStatsCount 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. The current count for this drop event. 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 between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
aristaAsicCountersMIB	1.3.6.1.4.1.30065.3.29			The MIB module for various counters on Arista devices.
aristaAsicCountersMibNotifications	1.3.6.1.4.1.30065.3.29.0
aristaAsicCountersMibObjects	1.3.6.1.4.1.30065.3.29.1
BIT aristaAsicInternalDropStatsRatesSupported	1.3.6.1.4.1.30065.3.29.1.1	Bits	read-only	Bitmap representing which rate objects from the aristaAsicInternalDropStatsTable are supported. The values defined here correspond to the objects aristaAsicInternalDropStats{1Min,10Min,1Hr,1Day,1Week} respectively. For every value in the bitmap, if it is set, then the value of the corresponding object in the aristaAsicInternalDropStatsTable is valid; otherwise, the value of the object has no meaning and should be ignored.
aristaAsicInternalDropStatsTable	1.3.6.1.4.1.30065.3.29.1.2		not-accessible	This table contains statistics for internal drop events.
aristaAsicInternalDropStatsEntry	1.3.6.1.4.1.30065.3.29.1.2.1		not-accessible	A single conceptual row providing internal drop event statistics.
STR aristaAsicInternalDropStatsChipName	1.3.6.1.4.1.30065.3.29.1.2.1.1	DisplayString	not-accessible	Identifier that represents the chip associated with this drop event.
STR aristaAsicInternalDropStatsCounterName	1.3.6.1.4.1.30065.3.29.1.2.1.2	DisplayString	not-accessible	Identifier that represents the name of this drop event.
C64 aristaAsicInternalDropStatsCountEx	1.3.6.1.4.1.30065.3.29.1.2.1.3	Counter64	read-only	The current count for this drop event.
NUM aristaAsicInternalDropStats1Min	1.3.6.1.4.1.30065.3.29.1.2.1.4	CounterBasedGauge64	read-only	The number of drop events of this type that have happened within the last 1 minute.
NUM aristaAsicInternalDropStats10Min	1.3.6.1.4.1.30065.3.29.1.2.1.5	CounterBasedGauge64	read-only	The number of drop events of this type that have happened within the last 10 minutes.
NUM aristaAsicInternalDropStats1Hr	1.3.6.1.4.1.30065.3.29.1.2.1.6	CounterBasedGauge64	read-only	The number of drop events of this type that have happened within the last hour.
NUM aristaAsicInternalDropStats1Day	1.3.6.1.4.1.30065.3.29.1.2.1.7	CounterBasedGauge64	read-only	The number of drop events of this type that have happened within the last day.
NUM aristaAsicInternalDropStats1Week	1.3.6.1.4.1.30065.3.29.1.2.1.8	CounterBasedGauge64	read-only	The number of drop events of this type that have happened within the last week.
TIM aristaAsicInternalDropStatsFirstTime	1.3.6.1.4.1.30065.3.29.1.2.1.9	TimeStamp	read-only	The time of the first occurence of this drop event.
TIM aristaAsicInternalDropStatsLastTime	1.3.6.1.4.1.30065.3.29.1.2.1.10	TimeStamp	read-only	The time of the latest occurence of this drop event.
aristaAsicCountersMibConformance	1.3.6.1.4.1.30065.3.29.2
aristaAsicCountersMibCompliances	1.3.6.1.4.1.30065.3.29.2.1
aristaAsicCountersMibCompliance	1.3.6.1.4.1.30065.3.29.2.1.1			The compliance statement for Arista switches that implement the ARISTA-ASIC-COUNTERS-MIB.
aristaAsicCountersMibGroups	1.3.6.1.4.1.30065.3.29.2.2
aristaAsicCountersMibDropScalarGroup	1.3.6.1.4.1.30065.3.29.2.2.1			The collection of scalar objects that provide internal drop statistics.
aristaAsicCountersMibDropTableGroup	1.3.6.1.4.1.30065.3.29.2.2.2			The collection of tabular objects that provide internal drop statistics.

RFC description

Monitors ASIC counters on Arista network devices including internal drop statistics and traffic metrics.

Start monitoring Arista Networks EOS switches 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 ARISTA-ASIC-COUNTERS-MIB