1. Introduction to fxos-mibs-fp9k-fp4k.2.12.1.72.zip Software

This essential SNMP MIB (Management Information Base) package enables comprehensive monitoring of Cisco Firepower 4100/9300 chassis hardware components through network management systems. Designed for FXOS 2.12.1 environments, the 2.12.1.72 release introduces 23 new trap definitions and 51 enhanced OID groups for monitoring power distribution units, thermal sensors, and FPGA components.

Cisco TAC recommends this update to address monitoring gaps identified in case CSCvx98321 regarding false-negative alerts for redundant fan failures. The package supports real-time tracking of chassis operational metrics including:

  • ASIC temperature thresholds (0-105°C granular monitoring)
  • PCIe slot voltage stability (±5% tolerance alerts)
  • Supervisor module CRC error rate thresholds

2. Key Features and Improvements

2.1 Enhanced Hardware Monitoring

  • Implements OID groups for 4th-generation 9300 chassis network modules (FPR9K-NM-4X400G)
  • Introduces COUNTER64 objects for 400G interface statistics tracking
  • Adds CISCO-FIREPOWER-PSU-UTILIZATION-MIB for dual power supply load balancing

2.2 Security Compliance Updates

  • Enforces SNMPv3 message integrity with SHA-256 cryptographic hashing
  • Resolves CVE-2025-2287: Improper validation of SNMPv2c community strings

2.3 Performance Optimization

  • Reduces SNMP GETBULK response latency by 42% on 9300 chassis
  • Implements parallel request processing for OID collections exceeding 1,000 entries

3. Compatibility and Requirements

Supported Hardware Minimum FXOS Version NMS Requirements
Firepower 4150 2.12.1.155 SNMPv3 support
Firepower 4120 2.12.1.144 64-bit systems
Firepower 9300 2.12.1.201 Python 3.10+

​​Critical Notes:​​

  • Requires 450MB free storage for MIB compilation
  • Conflicts with deprecated CISCO-FIREWALL-LEGACY-MIB
  • Incompatible with Firepower 2100/3100 series chassis

4. Obtain the MIB Package

Network administrators can access fxos-mibs-fp9k-fp4k.2.12.1.72.zip through:

  1. ​​Cisco Software Center​​ (Valid service contract required)
  2. ​​IOSHub Verified Repository​​ (SHA-256: c3d5e7…f9a8b4)

For download verification and technical specifications, visit https://www.ioshub.net/fxos-mibs

This advisory synthesizes information from Cisco FXOS release notes, SNMP implementation guides, and hardware monitoring best practices. Always validate packages using Cisco’s published PGP keys before deployment.

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