RADLAN-QCN-MIB

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Organization: Marvell Computer Communications Ltd.

Last Updated: 2010-03-21

Category: QoS and Traffic Management, Vendor: RADLAN/Cisco SB

Description: Configures Quantized Congestion Notification (IEEE 802.1Qau) for data center congestion management.

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What Is RADLAN-QCN-MIB?

RADLAN-QCN-MIB is a RADLAN (now Marvell) switch-software MIB implementing IEEE 802.1Qau Quantized Congestion Notification, used by data-center switches supporting converged/lossless Ethernet (DCB) to signal upstream traffic sources to throttle when congestion is detected. It exposes global and per-priority/per-interface configuration for QCN, including feature enable state, per-priority admin/operational enable status, congestion-point PFC and non-PFC set points, and feedback weight/sampling parameters. This MIB is used to monitor the software/protocol-level congestion-control status of a switch's data-center ports — whether QCN is enabled and operating on a given priority/interface, and the reason if it's administratively disabled — which helps diagnose microburst congestion or unexpected throughput throttling in DCB fabrics. It directly implements the IEEE 802.1Qau standard, layering RADLAN-specific configuration objects on top of that standard's congestion-notification model. It is deployed on data-center switches built on Marvell/RADLAN switch silicon and software in converged Ethernet/FCoE fabrics. Engineers can download the RADLAN-QCN-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in RADLAN-QCN-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

data-center switches with DCB/802.1Qau support (Marvell/RADLAN-based switch silicon)

Monitoring Examples

An admin would check rlQcnFeatureStatus to confirm QCN is enabled switch-wide, then walk rlQcnPriorityStateTable/rlQcnPriorityStateEntry to verify rlQcnPriorityOperStateEnable per priority and inspect rlQcnPriorityAdminStateReason if a priority shows disabled unexpectedly. Checking rlQcnIfStateTable/rlQcnIfStateEntry per rlQcnIfStateIfIndex reveals whether congestion-point creation (rlQcnIfStateCpCreationEn) is active on a specific interface, which would explain unexpected throughput throttling on that port during a congestion event.

What Can Be Monitored

QCN feature enable state
per-priority QCN admin/operational status
congestion-point set points
per-interface QCN state
admin-disable reason codes

Imported Objects

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero

From Q-BRIDGE-MIB

PortList

From RADLAN-MIB

Percents
rnd	OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
Counter64
Gauge32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks
Unsigned32

From SNMPv2-TC

DisplayString
RowPointer
RowStatus
TEXTUAL-CONVENTION
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
rlQcnMib	1.3.6.1.4.1.89.202			Added: rlQcnFeatureStatus rlQcnPriorityStateTable rlQcnIfStateTable rlQcnCmnPriority rlQcnCpPfcSetPoint rlQcnCpNonPfcSetPoint rlQcnCpFeedbackWeight rlQcnCpMinSampleBase.
T/F rlQcnFeatureStatus	1.3.6.1.4.1.89.202.1	TruthValue	read-write	This scalar indicates QCN enable status.
rlQcnPriorityStateTable	1.3.6.1.4.1.89.202.2		not-accessible	This table describes Quantized Congestion Notification per Priority state.
rlQcnPriorityStateEntry	1.3.6.1.4.1.89.202.2.1		not-accessible	Each entry in this table describes priority state. The index is represented by rlQcnPriorityStatePriority.
INT rlQcnPriorityStatePriority	1.3.6.1.4.1.89.202.2.1.1	INTEGER	not-accessible	802.1Q Priority.
T/F rlQcnPriorityAdminStateEnable	1.3.6.1.4.1.89.202.2.1.2	TruthValue	read-write	Admin status of this priority.
T/F rlQcnPriorityOperStateEnable	1.3.6.1.4.1.89.202.2.1.3	TruthValue	read-only	Operational status of this priority.
INT rlQcnPriorityAdminStateReason	1.3.6.1.4.1.89.202.2.1.4	INTEGER	read-only	Reason for admin status (if admin status not equal to oper).
ROW rlQcnPriorityStateStatus	1.3.6.1.4.1.89.202.2.1.5	RowStatus	read-write	The status of a table entry. It is used to delete/Add an entry from/to this table.
rlQcnIfStateTable	1.3.6.1.4.1.89.202.3		not-accessible	This table describes Quantized Congestion Notification per interface state.
rlQcnIfStateEntry	1.3.6.1.4.1.89.202.3.1		not-accessible	Each entry in this table describes state of the interface. The index is represented by rlQcnIfStateIfIndex.
INT rlQcnIfStateIfIndex	1.3.6.1.4.1.89.202.3.1.1	INTEGER	not-accessible	IfIndex.
T/F rlQcnIfStateCpCreationEn	1.3.6.1.4.1.89.202.3.1.2	TruthValue	read-write	Congestion point creation enable status. If CP creation is enabled for an interface, the system automatically creates a Congestion Point (CP) for a queue of that interface if at least one QCN priority (Oper state) is mapped to that queue.
ROW rlQcnIfStateStatus	1.3.6.1.4.1.89.202.3.1.3	RowStatus	read-write	The status of a table entry. It is used to delete/Add an entry from/to this table.
INT rlQcnCmnPriority	1.3.6.1.4.1.89.202.4	INTEGER	read-write	This scalar indicates priority which is used for all Congestion Notification Messages (CNMs) transmitted by the device.
INT rlQcnCpPfcSetPoint	1.3.6.1.4.1.89.202.5	INTEGER	read-write	This scalar indicates QCN set-point of an egress queue on PFC enabled interface. Value of set-point is in bytes and in multiples of 512.
INT rlQcnCpNonPfcSetPoint	1.3.6.1.4.1.89.202.6	INTEGER	read-write	This scalar indicates QCN set-point of an egress queue on PFC disabled interface. Value of set-point is in bytes and in multiples of 512.
INT rlQcnCpFeedbackWeight	1.3.6.1.4.1.89.202.7	INTEGER	read-write	This scalar indicates Feedback Weight of a QCN egress queue. The weight is equal to two to the power of this object. Thus, if this number contains a -1, weight = 1/2.
INT rlQcnCpMinSampleBase	1.3.6.1.4.1.89.202.8	INTEGER	read-write	This scalar indicates minimum number of bytes to enqueue in a QCN egress queue between transmissions of Congestion Notification Messages. Value of min-sample-base is in bytes and in multiples of 16.
INT rlQcnCpSetPoint	1.3.6.1.4.1.89.202.9	INTEGER	read-write	This scalar indicates QCN set-point of an egress queue. Value of set-point is in bytes and in multiples of 512.

RFC description

Configures Quantized Congestion Notification (QCN) per priority state and interface congestion handling.

Start monitoring data-center switches with DCB/802.1Qau support, Marvell/RADLAN-based switch silicon (Quantized Congestion Notification) 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 RADLAN-QCN-MIB

What Is RADLAN-QCN-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description