---
title: "New Features in Cisco IOS 12.4(15)T Release"
description: "Overview of key enhancements and capabilities in Cisco IOS 12.4(15)T release"
author: "Colin McNamara"
tags: ["cisco","ios","networking","security","infrastructure","routing"]
image: "https://colinmcnamara.com/images/blog/new-features-cisco-ios-12-4-15t/featured.png"
date: 2007-08-09
url: https://colinmcnamara.com/blog/new-features-cisco-ios-12-4-15t
---

# New Features in Cisco IOS 12.4(15)T Release

Cisco IOS Software Release 12.4(15)T, the sixth release in the 12.4T family, brings significant improvements across multiple technology areas. This release introduces several key enhancements:

## Core Improvements
- Streamlined software upgrade process
- Sub-second link failure detection
- Faster network convergence
- Next-generation Layer 2-7 flexible packet classification
- Enhanced intrusion protection
- Improved SSL VPN capabilities
- Support for the new Cisco 7201 Router

## Integrated Technologies
The release integrates innovations across multiple areas:
- Cisco IOS Security
- Voice capabilities
- Infrastructure improvements
- Access features
- High Availability
- Management Instrumentation
- Quality of Service
- IP Multicast
- Broadband support
- IP Routing
- IP Services

## Hardware Support
These integrated technologies are delivered across a broad range of hardware platforms:
- Cisco Integrated Services Routers
- Cisco 7200 Series
- Cisco 7301 Router

This release continues Cisco's commitment to delivering regular, feature-rich updates that enhance enterprise and access capabilities across their product portfolio.

*For detailed information, visit: http://www.cisco.com/application/pdf/en/us/guest/products/ps8258/c1161/cdccont_0900aecd80679ce3.pdf*