CISCO-FLASH-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsCISCO-FLASH-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2011-03-16

Category: Cisco Devices, Device Management

Description: Manages and queries flash file system data on Cisco devices, including flash partitioning, file listings, and file operations.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring CISCO-FLASH-MIB with a free 30-day trial of IPNetwork Monitor.

What Is CISCO-FLASH-MIB?

CISCO-FLASH-MIB is a long-standing, widely deployed Cisco proprietary MIB that manages the flash memory file system on Cisco routers and switches, spanning classic IOS platforms through modern IOS-XE devices. It exposes data about physical/logical flash devices present on a device, including device size, partitioning limits, chip count, and controller type, as well as file-level listings and file operations. It is heavily used for monitoring hardware storage health and capacity, such as detecting when a flash device is nearing capacity, verifying partition counts and sizes, or confirming expected firmware/config files are present, since a full or failing flash device can prevent a device from booting or saving configuration. CISCO-FLASH-MIB is largely self-contained but is commonly used alongside ENTITY-MIB to correlate flash devices with physical module slots. It is deployed across virtually all Cisco IOS/IOS-XE routers and switches that support removable or onboard flash storage. Engineers can download the CISCO-FLASH-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-FLASH-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

  • Cisco IOS/IOS-XE routers
  • Cisco Catalyst switches

Monitoring Examples

An admin would poll ciscoFlashDeviceTable/ciscoFlashDeviceEntry to enumerate each flash device by ciscoFlashDeviceIndex, checking ciscoFlashDeviceSize against ciscoFlashDeviceMinPartitionSize and ciscoFlashDeviceMaxPartitions to see how much usable space remains. ciscoFlashDeviceName and ciscoFlashDeviceDescr identify the device (e.g., "flash:" or a USB/SD slot), while ciscoFlashDeviceController and ciscoFlashDeviceChipCount describe the underlying hardware. If ciscoFlashDevicePartitions approaches ciscoFlashDeviceMaxPartitions, or available space computed from ciscoFlashDeviceSize drops low, it signals the device is running out of room for new IOS images or configuration backups.

What Can Be Monitored

  • flash device size
  • number of partitions
  • max partitions supported
  • chip count
  • flash device/controller identity
  • available flash storage capacity
Imported Objects

From CISCO-SMI

ciscoMgmtOBJECT-IDENTITY

From ENTITY-MIB

PhysicalIndex

From HCNUM-TC

CounterBasedGauge64

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks
Unsigned32

From SNMPv2-TC

DateAndTime
DisplayString
InstancePointer
RowStatus
TEXTUAL-CONVENTION
TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using ciscoFlashChipWriteRetries OID:

Select a Cisco IOS/IOS-XE router or Catalyst 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 ciscoFlashChipWriteRetries 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. This object will provide a cumulative count (since last system boot up or initialization) of the number of write retries that were done in the chip. 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 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

RFC description

Manages Cisco Flash memory devices including device info, partitions, file operations, and copy/erase operations.

Start monitoring Cisco IOS/IOS-XE routers and Catalyst 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 CISCO-FLASH-MIB