CT-PRIORITY-QUEUING

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Category: Quality of Service, Vendor: Cabletron/Enterasys

Description: Manages priority queuing parameters and queue scheduling algorithms on Cabletron/Enterasys devices.

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What Is CT-PRIORITY-QUEUING?

This Enterasys/Cabletron MIB (part of the "ctronExp" experimental MIB tree) configures priority queuing and traffic-class scheduling on Cabletron switching hardware, letting administrators map traffic to priority queues and define regeneration/priority values used in QoS scheduling. It exposes tables for user-defined priority mapping (ctUserDefTable, mapping a priority index to a value and number of traffic classes) and priority "regeneration" (ctRegenerationTable, mapping an incoming priority/ID to a regenerated value), plus a traffic-class table. Its monitoring/configuration value is in verifying how traffic is being classified and prioritized on the switch - confirming the number of traffic classes configured and that priority regeneration mappings match intended QoS policy - rather than raw hardware sensor data. It builds on generic IEEE 802.1p/traffic-class priority concepts and sits within Cabletron's broader "ctron" experimental MIB family alongside other CT-prefixed modules. It is typically deployed on Cabletron/Enterasys switches in networks requiring QoS traffic prioritization, monitored by administrators to audit or troubleshoot queue/priority mapping. Engineers can download the CT-PRIORITY-QUEUING file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CT-PRIORITY-QUEUING. 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

Enterasys/Cabletron network switch

Monitoring Examples

An administrator would walk ctUserDefTable/ctUserDefEntry to check ctUserDefPriorityValue against ctUserDefPriorityIndex and confirm ctUserDefNumTrafficClass matches the intended number of queues, and check ctRegenerationTable/ctRegenerationEntry (ctRegenerationIndex, ctRegenerationId, ctRegenerationValue) to verify incoming priority values are being regenerated/remapped as expected. A traffic class receiving unexpectedly little bandwidth could be traced back to an incorrect entry in ctTrafClassTable or a mismatched regeneration mapping.

What Can Be Monitored

priority-to-queue mapping
number of configured traffic classes
priority regeneration mapping
traffic class configuration

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

enterprises

OIDs

OID symbolic	OID numeric	Type	Access	Description
cabletron	1.3.6.1.4.1.52
mibs	1.3.6.1.4.1.52.4
ctronExp	1.3.6.1.4.1.52.4.2
ctVLANMib	1.3.6.1.4.1.52.4.2.12
ctVLANMgr	1.3.6.1.4.1.52.4.2.12.1
ctPriority	1.3.6.1.4.1.52.4.2.12.1.4
ctBasePriority	1.3.6.1.4.1.52.4.2.12.1.4.2
ctUserDefPriority	1.3.6.1.4.1.52.4.2.12.1.4.2.1
ctUserDefTable	1.3.6.1.4.1.52.4.2.12.1.4.2.1.1		not-accessible	A table that contains Default User Priority.
ctUserDefEntry	1.3.6.1.4.1.52.4.2.12.1.4.2.1.1.1		not-accessible	A list of default user priority for all ports.
INT ctUserDefPriorityIndex	1.3.6.1.4.1.52.4.2.12.1.4.2.1.1.1.1	INTEGER	read-only	Description of a specific instance for the default user priority table. The object identifier contains the port number.
INT ctUserDefPriorityValue	1.3.6.1.4.1.52.4.2.12.1.4.2.1.1.1.2	INTEGER	read-write	The current state of the Default User Priority parameter for a specific port.
INT ctUserDefNumTrafficClass	1.3.6.1.4.1.52.4.2.12.1.4.2.1.1.1.3	INTEGER	read-only	The number of Traffic Classes in the range 1 through 8 that are supported on each port.
ctRegenPriority	1.3.6.1.4.1.52.4.2.12.1.4.2.2
ctRegenerationTable	1.3.6.1.4.1.52.4.2.12.1.4.2.2.1		not-accessible	A table that contains the Regenerated Priority.
ctRegenerationEntry	1.3.6.1.4.1.52.4.2.12.1.4.2.2.1.1		not-accessible	A list of regenerated priority for each bridge port.
INT ctRegenerationIndex	1.3.6.1.4.1.52.4.2.12.1.4.2.2.1.1.1	INTEGER	read-only	Description of a specific instance of the CtRegeneration table. The object identifier contains port.
INT ctRegenerationId	1.3.6.1.4.1.52.4.2.12.1.4.2.2.1.1.2	INTEGER	read-only	Description of a specific instance of the CtRegeneration table. The object identifier contains the priority that is referenced.
INT ctRegenerationValue	1.3.6.1.4.1.52.4.2.12.1.4.2.2.1.1.3	INTEGER	read-write	Value of the regenerated priority.
ctTrafPriority	1.3.6.1.4.1.52.4.2.12.1.4.2.3
ctTrafClassTable	1.3.6.1.4.1.52.4.2.12.1.4.2.3.1		not-accessible	A table that lists the queue number for each Traffic Classes.
ctTrafClassEntry	1.3.6.1.4.1.52.4.2.12.1.4.2.3.1.1		not-accessible	A list of available queue for each Traffic Classes on each port.
INT ctTrafClassIndex	1.3.6.1.4.1.52.4.2.12.1.4.2.3.1.1.1	INTEGER	read-only	Description of a specific instance of the Traffic Classes table. The object identifier contains the port number.
INT ctTrafClassId	1.3.6.1.4.1.52.4.2.12.1.4.2.3.1.1.2	INTEGER	read-only	Description of a specific instance of the Traffic Classes table. The object identifier contains the priority that is referenced.
INT ctTrafClassValue	1.3.6.1.4.1.52.4.2.12.1.4.2.3.1.1.3	INTEGER	read-write	The queue number of Traffic Classes in the range of 0 to the number of Traffic Classes supported on this product.

RFC description

Cabletron's 802.1p priority queuing MIB for managing traffic class priorities on bridges.

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Download CT-PRIORITY-QUEUING

What Is CT-PRIORITY-QUEUING?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description