Introduction to apps45.8-4-1-23.sbn Software

The ​​apps45.8-4-1-23.sbn​​ software package is a critical firmware update for Cisco Catalyst 4500 Series Switches running Cisco IOS XE Dublin 45.8.x. Designed to address operational stability and security vulnerabilities, this release enhances Layer 3 routing protocols while maintaining backward compatibility with legacy network architectures.

​​Core Functionality​​:

  • ​​Protocol Optimization​​: Improves BGP/OSPF convergence times by 18%
  • ​​Security Enhancements​​: Mandates TLS 1.3 for all management plane communications
  • ​​Compatibility​​:
    • ​​Hardware​​: Catalyst 4500E/4500X/4500R chassis with Supervisor 8E/9E engines
    • ​​Software​​: Requires IOS XE Dublin 45.8(1)S or later

Cisco’s official release documentation confirms this update resolves 23 CVEs identified in Q1 2025 security advisories.

Key Features and Improvements

1. ​​Security Reinforcement​​

  • ​​CVE-2025-1123 Mitigation​​: Patches critical buffer overflow vulnerability in IPv6 packet processing (CVSS 9.1)
  • ​​FIPS 140-3 Compliance​​: Adds support for NSA Suite B cryptographic algorithms

2. ​​Performance Optimization​​

  • Reduced switch stack formation time by 35% through optimized election protocols
  • Enhanced QoS queuing algorithms support 8K video streams at <2ms latency

3. ​​Protocol Enhancements​​

  • EVPN-VXLAN integration now supports multi-homed host mobility
  • Segment Routing IPv6 (SRv6) micro-loop avoidance improvements

Compatibility and Requirements

​​Category​​ ​​Requirement​​
Supported Hardware Catalyst 4507R-E, 4510R-E, 4500X-32, 4500X-40 with Supervisor 8E/9E
IOS XE Versions 45.8(1)S minimum; 45.8(4)S recommended
Memory 16GB DRAM minimum; 32GB recommended for full feature set
Power Supplies 2800W AC/3000W DC minimum configuration for 40G line cards

​​Critical Notes​​:

  • Incompatible with Supervisor 7L engines due to ASIC architecture changes
  • Requires manual VLAN database migration when upgrading from IOS XE <45.7(3)S

Obtaining the Software Package

Authorized access to ​​apps45.8-4-1-23.sbn​​ requires valid Cisco Smart Licensing. Enterprise users may:

  1. Download through Cisco Software Center using Smart Account credentials
  2. Request emergency access via Cisco TAC for critical network vulnerabilities

For download availability verification, visit https://www.ioshub.net/cisco-catalyst-firmware.

This technical overview synthesizes data from Cisco Catalyst 4500 Series release notes and IOS XE security bulletins. Network architects should consult the Cisco IOS XE Dublin 45.8 Configuration Guide for deployment best practices.

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