ARISTA-QOS-MIB

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Organization: Arista Networks, Inc.

Last Updated: 2016-07-22

Category: Vendor: Arista

Description: Arista EOS quality of service policy configuration and per-class traffic statistics.

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What Is ARISTA-QOS-MIB?

ARISTA-QOS-MIB is Arista Networks' vendor MIB for EOS-based switches, providing Quality-of-Service policy configuration and per-traffic-class statistics. It exposes class-map, policy-map, and service-policy configuration objects defining how traffic is classified and matched, alongside counters for packets dropped, sent, and matched per traffic class after policy is applied. It supports monitoring of QoS enforcement in the data plane -- specifically per-class packet counters revealing whether traffic is being classified, policed, or dropped as configured -- which is key to diagnosing congestion or misapplied QoS policy on a switch. It is a self-contained vendor MIB but conceptually parallels the standard DIFFSERV-MIB approach to class/policy modeling. It is deployed on Arista EOS switches in data center and campus networks where administrators verify QoS policies, such as prioritizing storage or VoIP traffic, are functioning as intended. Engineers can download the ARISTA-QOS-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ARISTA-QOS-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 EOS switches

Monitoring Examples

An administrator would walk aristaClassMapTable (aristaClassMapId, aristaClassMapName, aristaClassMapMatchCondition) to see how traffic classes are defined, then check the associated criteria in aristaClassMapMatchTable (aristaClassMapMatchType, aristaClassMapMatchName). Polling aristaPolicyMapTable alongside per-class dropped/sent/matched packet counters could reveal an unexpectedly high drop count on a storage-traffic class, indicating the configured policer is too aggressive or the class is receiving more traffic than it was provisioned for.

What Can Be Monitored

QoS class-map definitions and match conditions
policy-map/service-policy configuration
per-class packets sent
per-class packets dropped
per-class packets matched

Imported Objects

From ARISTA-SMI-MIB

aristaMibs

OBJECT-IDENTITY

From ENTITY-MIB

PhysicalIndexOrZero

From IF-MIB

InterfaceIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DisplayString
TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using aristaQosPktsDropped OID:

Select an Arista 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 aristaQosPktsDropped 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 number of packets dropped by a service policy. 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
aristaQosMib	1.3.6.1.4.1.30065.3.13			******************************** Overview ****************************** This MIB provides read access to Quality of Service (QoS) configuration and statistics information for Arista platforms. Configuration information available through this MIB includes all class-map, policy-map, and service-policy parameters. The definitions of these object types are given below. Statistics available through this MIB include dropped, sent and matched packet counters per traffic class after any configured QoS policies are applied and per chip ECN counters if supported. ****************************** Definitions ******************************** Class map - A data structure that uses access-control lists to define a data stream. Policy map - A data structure that associates class maps identifying specific data streams with actions that control its transmission. Action - A traffic-management action that is applied to traffic classified as belonging to a particular class. Actions may include modifying CoS or DSCP fields, assigning to traffic-class queues, shaping, or filtering.
aristaQosMibObjects	1.3.6.1.4.1.30065.3.13.1
aristaClassMapTable	1.3.6.1.4.1.30065.3.13.1.1		not-accessible	Lists the class maps configured on the system.
aristaClassMapEntry	1.3.6.1.4.1.30065.3.13.1.1.1		not-accessible	A conceptual row in aristaClassMapTable.
ARI aristaClassMapId	1.3.6.1.4.1.30065.3.13.1.1.1.1	AristaQosShortId	not-accessible	Bounded-length identifier for a given class map, derived from the class map's name.
ARI aristaClassMapType	1.3.6.1.4.1.30065.3.13.1.1.1.2	AristaQosMapType	not-accessible	Type of a given class map.
STR aristaClassMapName	1.3.6.1.4.1.30065.3.13.1.1.1.3	DisplayString	read-only	Name of a given class map.
INT aristaClassMapMatchCondition	1.3.6.1.4.1.30065.3.13.1.1.1.4	INTEGER	read-only	Indicates how many match criteria traffic must match in order to belong to a class with multiple match critera.
aristaClassMapMatchTable	1.3.6.1.4.1.30065.3.13.1.2		not-accessible	Describes the match criteria used to classify traffic as belonging to a class map.
aristaClassMapMatchEntry	1.3.6.1.4.1.30065.3.13.1.2.1		not-accessible	A conceptual row in the aristaClassMapMatchTable.
I32 aristaClassMapMatchIndex	1.3.6.1.4.1.30065.3.13.1.2.1.1	Integer32	not-accessible	This index identifies the position of a match criterion among all the criteria for a class map.
INT aristaClassMapMatchType	1.3.6.1.4.1.30065.3.13.1.2.1.2	INTEGER	read-only	Indicates the type of a match criterion for a class map. ipv4AccessGroup(1) means that it is an IPv4 access-control list. ipv6AccessGroup(2) means that it is an IPv6 access-control list. vlan(3) means that it is a VLAN-based match criterion.
STR aristaClassMapMatchName	1.3.6.1.4.1.30065.3.13.1.2.1.3	DisplayString	read-only	Indicates the name of the access-control list if aristaClassMapMatchType is ipv4AccessGroup(1) or ipv6AccessGroup(2). Otherwise, it indicates the masked VLAN value or the comma-separated list of VLAN range values contained in the match criterion.
aristaPolicyMapTable	1.3.6.1.4.1.30065.3.13.1.3		not-accessible	Lists the policy maps configured on the system.
aristaPolicyMapEntry	1.3.6.1.4.1.30065.3.13.1.3.1		not-accessible	A conceptual row in aristaPolicyMapTable.
ARI aristaPolicyMapId	1.3.6.1.4.1.30065.3.13.1.3.1.1	AristaQosShortId	not-accessible	Bounded-length identifier for a given policy map, derived from the policy map's name.
ARI aristaPolicyMapType	1.3.6.1.4.1.30065.3.13.1.3.1.2	AristaQosMapType	not-accessible	Type of a given policy map.
STR aristaPolicyMapName	1.3.6.1.4.1.30065.3.13.1.3.1.3	DisplayString	read-only	Name of a given policy map.
aristaPolicyMapClassTable	1.3.6.1.4.1.30065.3.13.1.4		not-accessible	Lists the classes associated with a given policy map.
aristaPolicyMapClassEntry	1.3.6.1.4.1.30065.3.13.1.4.1		not-accessible	A conceptual row in aristaPolicyMapClassTable.
I32 aristaPolicyMapClassIndex	1.3.6.1.4.1.30065.3.13.1.4.1.1	Integer32	not-accessible	Determines the sequence in which traffic is matched to classes within a policy map. The class with the smallest aristaPolicyMapClassIndex is given the first preference. Class Index values may not be consecutive.
ARI aristaPolicyMapClassId	1.3.6.1.4.1.30065.3.13.1.4.1.2	AristaQosShortId	read-only	Identifier of the class map for a given class in a policy map.
aristaPolicyMapActionTable	1.3.6.1.4.1.30065.3.13.1.5		not-accessible	Lists the actions that are applied to traffic classified as belonging to a particular class in a policy map.
aristaPolicyMapActionEntry	1.3.6.1.4.1.30065.3.13.1.5.1		not-accessible	A conceptual row in the aristaPolicyMapActionTable.
INT aristaPolicyMapActionType	1.3.6.1.4.1.30065.3.13.1.5.1.1	INTEGER	not-accessible	Type of a traffic-management action. For example: If the action is 'set cos 5', then the action type is 'actionSetCos'.
INT aristaPolicyMapActionRateUnit	1.3.6.1.4.1.30065.3.13.1.5.1.2	INTEGER	read-only	Indicates the rate unit of shaping/bandwidth actions. rateUnitNone - This action is not a shaping or bandwidth action. rateUnitPps - Packets per second rateUnitKbps - Kilobits per second
I32 aristaPolicyMapActionValue	1.3.6.1.4.1.30065.3.13.1.5.1.3	Integer32	read-only	Value applied in a traffic-management action. For example: If the action is 'set cos 5', then aristaPolicyMapActionValue is 5.
aristaServicePolicyTable	1.3.6.1.4.1.30065.3.13.1.6		not-accessible	Lists the policy maps currently applied to interfaces.
aristaServicePolicyEntry	1.3.6.1.4.1.30065.3.13.1.6.1		not-accessible	A conceptual row in the aristaServicePolicyTable.
NUM aristaServicePolicyIfIndex	1.3.6.1.4.1.30065.3.13.1.6.1.1	InterfaceIndex	not-accessible	The index of interface to which a policy map is applied.
INT aristaServicePolicyDirection	1.3.6.1.4.1.30065.3.13.1.6.1.2	INTEGER	not-accessible	The direction of traffic for which the service policy applies. input - The service policy applies to inbound traffic. output - The service policy applies to outbound traffic.
ARI aristaServicePolicyMapId	1.3.6.1.4.1.30065.3.13.1.6.1.3	AristaQosShortId	read-only	Identifier of the policy map applied to the interface.
ARI aristaServicePolicyMapType	1.3.6.1.4.1.30065.3.13.1.6.1.4	AristaQosMapType	read-only	Type of the policy map applied to the interface.
aristaQosStatsTable	1.3.6.1.4.1.30065.3.13.1.7		not-accessible	An entry in this table contains dropped, sent and matched packet counters for a given class of a policy map applied in a given direction. Counts are aggregated for all interfaces.
aristaQosStatsEntry	1.3.6.1.4.1.30065.3.13.1.7.1		not-accessible	A conceptual row in the aristaQosStatsTable.
C64 aristaQosPktsDroppedEx	1.3.6.1.4.1.30065.3.13.1.7.1.1	Counter64	read-only	The number of packets dropped by a service policy. This number is zero for classes of type dataPlane.
C64 aristaQosPktsSent	1.3.6.1.4.1.30065.3.13.1.7.1.2	Counter64	read-only	The number of packets classified by a service policy and allowed through.
C64 aristaQosPktsMatched	1.3.6.1.4.1.30065.3.13.1.7.1.3	Counter64	read-only	The number of packets classified by a service policy. Equal to the sum of aristaQosPktsDropped and aristaQosPktsSent.
aristaEcnCounterTable	1.3.6.1.4.1.30065.3.13.1.8		not-accessible	Lists the ECN Counter Value per unit as supported. Since different Arista devices have different capabilities for ECN counters, the table would contain the counter information per entity. This includes both packets that were received with congestion marked (ECN bits set) as well as packets that this Arista device marked with ECN bits before transmission. In cases where the platform is unable to count the already marked packets, the counter will only reflect the ones being marked by this specific device on the transmit side.
aristaEcnCounterEntry	1.3.6.1.4.1.30065.3.13.1.8.1		not-accessible	A conceptual row in the aristaEcnCounterTable.
STR aristaEcnCounterDescriptor	1.3.6.1.4.1.30065.3.13.1.8.1.1	DisplayString	not-accessible	Describes the entity that the counter corresponds to. For instance, devices supporting ECN counters per forwarding element (or per chip) will have descriptor containing information like
C64 aristaEcnCounterValue	1.3.6.1.4.1.30065.3.13.1.8.1.2	Counter64	read-only	The number of packets above average threshhold
PHY aristaEcnCounterEntity	1.3.6.1.4.1.30065.3.13.1.8.1.3	PhysicalIndexOrZero	read-only	The physical index corresponding to the entity which is a non zero value used to identify a physical entity. This value will be zero if the entity does not have a physical index
aristaQosMibConformance	1.3.6.1.4.1.30065.3.13.2
aristaQosMibCompliances	1.3.6.1.4.1.30065.3.13.2.1
aristaQosMibCompliance	1.3.6.1.4.1.30065.3.13.2.1.1			The compliance statement for Arista switches that support ARISTA-QOS-MIB.
aristaQosMibGroups	1.3.6.1.4.1.30065.3.13.2.2
aristaClassMapGroup	1.3.6.1.4.1.30065.3.13.2.2.1			The collection of objects that represent QoS configuration and statistics information for class maps.
aristaPolicyMapGroup	1.3.6.1.4.1.30065.3.13.2.2.2			The collection of objects that represent QoS configuration information for policy maps.
aristaPolicyMapActionGroup	1.3.6.1.4.1.30065.3.13.2.2.3			The collection of objects that represent configuration information for QoS actions.
aristaServicePolicyGroup	1.3.6.1.4.1.30065.3.13.2.2.4			The collection of objects that represent QoS configuration information for service policies.
aristaEcnCounterGroup	1.3.6.1.4.1.30065.3.13.2.2.5			The objects that represent ECN counter information

RFC description

Vendor-private Arista MIB for Quality of Service (QoS) management; defines objects for configuring and monitoring QoS policies, queue statistics, and traffic shaping on Arista switches.

Start monitoring Arista 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-QOS-MIB