MARVELL-SCT-MIB

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Organization: MARVELL Semiconductor, Inc.

Last Updated: 2010-08-16

Category: Quality of Service, Technology: Switching/L2, Vendor: Marvell

Description: Marvell Semiconductor Storm Control Threshold (SCT) MIB providing broadcast, multicast, and unknown unicast storm suppression objects.

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What Is MARVELL-SCT-MIB?

This is a Marvell Semiconductor private MIB for Storm Control Threshold (SCT) management, controlling how a switch built on Marvell switching silicon suppresses excessive broadcast, multicast, or unknown-unicast traffic that could otherwise overwhelm the CPU or flood the network. It exposes configuration data governing storm control behavior, notably CPU-rate-based suppression settings (rlSctCpuRateEnabled, rlSctCpuRate) that limit how much of the switch's CPU processing capacity storm traffic is allowed to consume. Its monitoring value is protecting control-plane/CPU health, verifying storm control is enabled where expected and that the configured CPU rate limit is appropriate, since a disabled or misconfigured storm-control setting is a common root cause of a switch's management CPU becoming unresponsive during a broadcast storm. It is a Marvell chipset-level private extension used by switch vendors building on Marvell silicon rather than a formal IETF standard. It is deployed on Marvell-silicon-based managed switches across enterprise and small/medium business networks as a control-plane protection mechanism. Engineers can download the MARVELL-SCT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in MARVELL-SCT-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

Marvell-silicon-based managed switch (various OEM platforms)

Monitoring Examples

An administrator would check rlSctCpuRateEnabled to confirm CPU-rate-based storm control is active on the switch, then check rlSctCpuRate to see the configured ceiling on CPU cycles storm traffic is permitted to consume. If a switch is experiencing management-plane slowness during periods of high broadcast traffic, finding rlSctCpuRateEnabled disabled would immediately explain the issue and point to enabling it as the fix. Beyond these two CPU-rate objects, no further runtime objects were captured for this MIB.

What Can Be Monitored

storm control (CPU rate limiting) enabled status
configured CPU rate threshold for storm suppression

Imported Objects

From RADLAN-MIB

rnd	OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
OBJECT-TYPE

From SNMPv2-TC

TruthValue

How to Use in IPNetwork Monitor

Example using rlSctCpuRate OID:

Select a Marvell-silicon-based managed switch (Storm Control Threshold) 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 rlSctCpuRate into the Find box to locate it in the OID tree, then select it and click OK. The amount of packets per second the CPU is handling. 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 Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if utilization exceeds 85%, a common warning threshold before sustained high load affects performance. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
rlSctMib	1.3.6.1.4.1.89.203			The private MIB module definition for SCT MIB.
T/F rlSctCpuRateEnabled	1.3.6.1.4.1.89.203.1	TruthValue	read-write	Indication whether the counter CPU rate is enabled
C32 rlSctCpuRateEx	1.3.6.1.4.1.89.203.2	Counter32	read-only	the amount of packets per second the CPU is handling.

RFC description

Marvell vendor-private MIB for Storage Controller Test (SCT) or storage subsystem management on Marvell systems.

Start monitoring Marvell-silicon-based managed switch (Storm Control Threshold) 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 MARVELL-SCT-MIB